Index: autoconf/Makefile.am
==================================================================
--- autoconf/Makefile.am
+++ autoconf/Makefile.am
@@ -4,12 +4,13 @@
 lib_LTLIBRARIES = libsqlite3.la
 libsqlite3_la_SOURCES = sqlite3.c
 libsqlite3_la_LDFLAGS = -no-undefined -version-info 8:6:8
 
 bin_PROGRAMS = sqlite3
-sqlite3_SOURCES = shell.c sqlite3.c sqlite3.h
-sqlite3_LDADD = @READLINE_LIBS@
+sqlite3_SOURCES = shell.c sqlite3.h
+EXTRA_sqlite3_SOURCES = sqlite3.c
+sqlite3_LDADD = @EXTRA_SHELL_OBJ@ @READLINE_LIBS@
 sqlite3_DEPENDENCIES = @EXTRA_SHELL_OBJ@
 sqlite3_CFLAGS = $(AM_CFLAGS) -DSQLITE_ENABLE_EXPLAIN_COMMENTS
 
 include_HEADERS = sqlite3.h sqlite3ext.h
 

Index: autoconf/configure.ac
==================================================================
--- autoconf/configure.ac
+++ autoconf/configure.ac
@@ -128,11 +128,11 @@
 AC_ARG_ENABLE(static-shell, [AS_HELP_STRING(
   [--enable-static-shell], 
   [statically link libsqlite3 into shell tool [default=yes]])], 
   [], [enable_static_shell=yes])
 if test x"$enable_static_shell" == "xyes"; then
-  EXTRA_SHELL_OBJ=sqlite3.$OBJEXT
+  EXTRA_SHELL_OBJ=sqlite3-sqlite3.$OBJEXT
 else
   EXTRA_SHELL_OBJ=libsqlite3.la
 fi
 AC_SUBST(EXTRA_SHELL_OBJ)
 #-----------------------------------------------------------------------

Index: ext/fts3/fts3_write.c
==================================================================
--- ext/fts3/fts3_write.c
+++ ext/fts3/fts3_write.c
@@ -3193,11 +3193,11 @@
   if( iLevel==FTS3_SEGCURSOR_ALL ){
     /* This call is to merge all segments in the database to a single
     ** segment. The level of the new segment is equal to the numerically
     ** greatest segment level currently present in the database for this
     ** index. The idx of the new segment is always 0.  */
-    if( csr.nSegment==1 ){
+    if( csr.nSegment==1 && 0==fts3SegReaderIsPending(csr.apSegment[0]) ){
       rc = SQLITE_DONE;
       goto finished;
     }
     iNewLevel = iMaxLevel;
     bIgnoreEmpty = 1;

Index: ext/fts5/fts5Int.h
==================================================================
--- ext/fts5/fts5Int.h
+++ ext/fts5/fts5Int.h
@@ -170,10 +170,11 @@
   /* Values loaded from the %_config table */
   int iCookie;                    /* Incremented when %_config is modified */
   int pgsz;                       /* Approximate page size used in %_data */
   int nAutomerge;                 /* 'automerge' setting */
   int nCrisisMerge;               /* Maximum allowed segments per level */
+  int nUsermerge;                 /* 'usermerge' setting */
   int nHashSize;                  /* Bytes of memory for in-memory hash */
   char *zRank;                    /* Name of rank function */
   char *zRankArgs;                /* Arguments to rank function */
 
   /* If non-NULL, points to sqlite3_vtab.base.zErrmsg. Often NULL. */
@@ -697,10 +698,16 @@
   int eType,
   Fts5ExprNode *pLeft,
   Fts5ExprNode *pRight,
   Fts5ExprNearset *pNear
 );
+
+Fts5ExprNode *sqlite3Fts5ParseImplicitAnd(
+  Fts5Parse *pParse,
+  Fts5ExprNode *pLeft,
+  Fts5ExprNode *pRight
+);
 
 Fts5ExprPhrase *sqlite3Fts5ParseTerm(
   Fts5Parse *pParse, 
   Fts5ExprPhrase *pPhrase, 
   Fts5Token *pToken,

Index: ext/fts5/fts5_config.c
==================================================================
--- ext/fts5/fts5_config.c
+++ ext/fts5/fts5_config.c
@@ -16,10 +16,11 @@
 
 #include "fts5Int.h"
 
 #define FTS5_DEFAULT_PAGE_SIZE   4050
 #define FTS5_DEFAULT_AUTOMERGE      4
+#define FTS5_DEFAULT_USERMERGE      4
 #define FTS5_DEFAULT_CRISISMERGE   16
 #define FTS5_DEFAULT_HASHSIZE    (1024*1024)
 
 /* Maximum allowed page size */
 #define FTS5_MAX_PAGE_SIZE (128*1024)
@@ -439,11 +440,13 @@
       int ii = fts5Dequote(zOut);
       zRet = &zIn[ii];
       *pbQuoted = 1;
     }else{
       zRet = fts5ConfigSkipBareword(zIn);
-      zOut[zRet-zIn] = '\0';
+      if( zRet ){
+        zOut[zRet-zIn] = '\0';
+      }
     }
   }
 
   if( zRet==0 ){
     sqlite3_free(zOut);
@@ -854,10 +857,22 @@
     }else{
       if( nAutomerge==1 ) nAutomerge = FTS5_DEFAULT_AUTOMERGE;
       pConfig->nAutomerge = nAutomerge;
     }
   }
+
+  else if( 0==sqlite3_stricmp(zKey, "usermerge") ){
+    int nUsermerge = -1;
+    if( SQLITE_INTEGER==sqlite3_value_numeric_type(pVal) ){
+      nUsermerge = sqlite3_value_int(pVal);
+    }
+    if( nUsermerge<2 || nUsermerge>16 ){
+      *pbBadkey = 1;
+    }else{
+      pConfig->nUsermerge = nUsermerge;
+    }
+  }
 
   else if( 0==sqlite3_stricmp(zKey, "crisismerge") ){
     int nCrisisMerge = -1;
     if( SQLITE_INTEGER==sqlite3_value_numeric_type(pVal) ){
       nCrisisMerge = sqlite3_value_int(pVal);
@@ -901,10 +916,11 @@
   int iVersion = 0;
 
   /* Set default values */
   pConfig->pgsz = FTS5_DEFAULT_PAGE_SIZE;
   pConfig->nAutomerge = FTS5_DEFAULT_AUTOMERGE;
+  pConfig->nUsermerge = FTS5_DEFAULT_USERMERGE;
   pConfig->nCrisisMerge = FTS5_DEFAULT_CRISISMERGE;
   pConfig->nHashSize = FTS5_DEFAULT_HASHSIZE;
 
   zSql = sqlite3Fts5Mprintf(&rc, zSelect, pConfig->zDb, pConfig->zName);
   if( zSql ){

Index: ext/fts5/fts5_expr.c
==================================================================
--- ext/fts5/fts5_expr.c
+++ ext/fts5/fts5_expr.c
@@ -256,10 +256,12 @@
       pNew->pConfig = pConfig;
       pNew->apExprPhrase = sParse.apPhrase;
       pNew->nPhrase = sParse.nPhrase;
       sParse.apPhrase = 0;
     }
+  }else{
+    sqlite3Fts5ParseNodeFree(sParse.pExpr);
   }
 
   sqlite3_free(sParse.apPhrase);
   *pzErr = sParse.zErr;
   return sParse.rc;
@@ -1266,10 +1268,12 @@
   pNode->bNomatch = 0;
 
   if( Fts5NodeIsString(pNode) ){
     /* Initialize all term iterators in the NEAR object. */
     rc = fts5ExprNearInitAll(pExpr, pNode);
+  }else if( pNode->xNext==0 ){
+    pNode->bEof = 1;
   }else{
     int i;
     int nEof = 0;
     for(i=0; i<pNode->nChild && rc==SQLITE_OK; i++){
       Fts5ExprNode *pChild = pNode->apChild[i];
@@ -1317,27 +1321,26 @@
 ** Return SQLITE_OK if successful, or an SQLite error code otherwise. It
 ** is not considered an error if the query does not match any documents.
 */
 int sqlite3Fts5ExprFirst(Fts5Expr *p, Fts5Index *pIdx, i64 iFirst, int bDesc){
   Fts5ExprNode *pRoot = p->pRoot;
-  int rc = SQLITE_OK;
-  if( pRoot->xNext ){
-    p->pIndex = pIdx;
-    p->bDesc = bDesc;
-    rc = fts5ExprNodeFirst(p, pRoot);
-
-    /* If not at EOF but the current rowid occurs earlier than iFirst in
-    ** the iteration order, move to document iFirst or later. */
-    if( pRoot->bEof==0 && fts5RowidCmp(p, pRoot->iRowid, iFirst)<0 ){
-      rc = fts5ExprNodeNext(p, pRoot, 1, iFirst);
-    }
-
-    /* If the iterator is not at a real match, skip forward until it is. */
-    while( pRoot->bNomatch ){
-      assert( pRoot->bEof==0 && rc==SQLITE_OK );
-      rc = fts5ExprNodeNext(p, pRoot, 0, 0);
-    }
+  int rc;                         /* Return code */
+
+  p->pIndex = pIdx;
+  p->bDesc = bDesc;
+  rc = fts5ExprNodeFirst(p, pRoot);
+
+  /* If not at EOF but the current rowid occurs earlier than iFirst in
+  ** the iteration order, move to document iFirst or later. */
+  if( pRoot->bEof==0 && fts5RowidCmp(p, pRoot->iRowid, iFirst)<0 ){
+    rc = fts5ExprNodeNext(p, pRoot, 1, iFirst);
+  }
+
+  /* If the iterator is not at a real match, skip forward until it is. */
+  while( pRoot->bNomatch ){
+    assert( pRoot->bEof==0 && rc==SQLITE_OK );
+    rc = fts5ExprNodeNext(p, pRoot, 0, 0);
   }
   return rc;
 }
 
 /*
@@ -1442,10 +1445,25 @@
   if( pRet==0 ){
     assert( pParse->rc!=SQLITE_OK );
     sqlite3Fts5ParseNearsetFree(pNear);
     sqlite3Fts5ParsePhraseFree(pPhrase);
   }else{
+    if( pRet->nPhrase>0 ){
+      Fts5ExprPhrase *pLast = pRet->apPhrase[pRet->nPhrase-1];
+      assert( pLast==pParse->apPhrase[pParse->nPhrase-2] );
+      if( pPhrase->nTerm==0 ){
+        fts5ExprPhraseFree(pPhrase);
+        pRet->nPhrase--;
+        pParse->nPhrase--;
+        pPhrase = pLast;
+      }else if( pLast->nTerm==0 ){
+        fts5ExprPhraseFree(pLast);
+        pParse->apPhrase[pParse->nPhrase-2] = pPhrase;
+        pParse->nPhrase--;
+        pRet->nPhrase--;
+      }
+    }
     pRet->apPhrase[pRet->nPhrase++] = pPhrase;
   }
   return pRet;
 }
 
@@ -1474,12 +1492,11 @@
   UNUSED_PARAM2(iUnused1, iUnused2);
 
   /* If an error has already occurred, this is a no-op */
   if( pCtx->rc!=SQLITE_OK ) return pCtx->rc;
 
-  assert( pPhrase==0 || pPhrase->nTerm>0 );
-  if( pPhrase && (tflags & FTS5_TOKEN_COLOCATED) ){
+  if( pPhrase && pPhrase->nTerm>0 && (tflags & FTS5_TOKEN_COLOCATED) ){
     Fts5ExprTerm *pSyn;
     int nByte = sizeof(Fts5ExprTerm) + sizeof(Fts5Buffer) + nToken+1;
     pSyn = (Fts5ExprTerm*)sqlite3_malloc(nByte);
     if( pSyn==0 ){
       rc = SQLITE_NOMEM;
@@ -1576,11 +1593,11 @@
   sqlite3_free(z);
   if( rc || (rc = sCtx.rc) ){
     pParse->rc = rc;
     fts5ExprPhraseFree(sCtx.pPhrase);
     sCtx.pPhrase = 0;
-  }else if( sCtx.pPhrase ){
+  }else{
 
     if( pAppend==0 ){
       if( (pParse->nPhrase % 8)==0 ){
         int nByte = sizeof(Fts5ExprPhrase*) * (pParse->nPhrase + 8);
         Fts5ExprPhrase **apNew;
@@ -1593,13 +1610,18 @@
         pParse->apPhrase = apNew;
       }
       pParse->nPhrase++;
     }
 
+    if( sCtx.pPhrase==0 ){
+      /* This happens when parsing a token or quoted phrase that contains
+      ** no token characters at all. (e.g ... MATCH '""'). */
+      sCtx.pPhrase = sqlite3Fts5MallocZero(&pParse->rc, sizeof(Fts5ExprPhrase));
+    }else if( sCtx.pPhrase->nTerm ){
+      sCtx.pPhrase->aTerm[sCtx.pPhrase->nTerm-1].bPrefix = bPrefix;
+    }
     pParse->apPhrase[pParse->nPhrase-1] = sCtx.pPhrase;
-    assert( sCtx.pPhrase->nTerm>0 );
-    sCtx.pPhrase->aTerm[sCtx.pPhrase->nTerm-1].bPrefix = bPrefix;
   }
 
   return sCtx.pPhrase;
 }
 
@@ -1691,27 +1713,29 @@
 void sqlite3Fts5ParseSetDistance(
   Fts5Parse *pParse, 
   Fts5ExprNearset *pNear,
   Fts5Token *p
 ){
-  int nNear = 0;
-  int i;
-  if( p->n ){
-    for(i=0; i<p->n; i++){
-      char c = (char)p->p[i];
-      if( c<'0' || c>'9' ){
-        sqlite3Fts5ParseError(
-            pParse, "expected integer, got \"%.*s\"", p->n, p->p
-        );
-        return;
-      }
-      nNear = nNear * 10 + (p->p[i] - '0');
-    }
-  }else{
-    nNear = FTS5_DEFAULT_NEARDIST;
-  }
-  pNear->nNear = nNear;
+  if( pNear ){
+    int nNear = 0;
+    int i;
+    if( p->n ){
+      for(i=0; i<p->n; i++){
+        char c = (char)p->p[i];
+        if( c<'0' || c>'9' ){
+          sqlite3Fts5ParseError(
+              pParse, "expected integer, got \"%.*s\"", p->n, p->p
+              );
+          return;
+        }
+        nNear = nNear * 10 + (p->p[i] - '0');
+      }
+    }else{
+      nNear = FTS5_DEFAULT_NEARDIST;
+    }
+    pNear->nNear = nNear;
+  }
 }
 
 /*
 ** The second argument passed to this function may be NULL, or it may be
 ** an existing Fts5Colset object. This function returns a pointer to
@@ -1894,14 +1918,18 @@
       fts5ExprAssignXNext(pRet);
       if( eType==FTS5_STRING ){
         int iPhrase;
         for(iPhrase=0; iPhrase<pNear->nPhrase; iPhrase++){
           pNear->apPhrase[iPhrase]->pNode = pRet;
+          if( pNear->apPhrase[iPhrase]->nTerm==0 ){
+            pRet->xNext = 0;
+            pRet->eType = FTS5_EOF;
+          }
         }
 
         if( pParse->pConfig->eDetail!=FTS5_DETAIL_FULL 
-         && (pNear->nPhrase!=1 || pNear->apPhrase[0]->nTerm!=1)
+         && (pNear->nPhrase!=1 || pNear->apPhrase[0]->nTerm>1)
         ){
           assert( pParse->rc==SQLITE_OK );
           pParse->rc = SQLITE_ERROR;
           assert( pParse->zErr==0 );
           pParse->zErr = sqlite3_mprintf(
@@ -1923,10 +1951,74 @@
     assert( pParse->rc!=SQLITE_OK );
     sqlite3Fts5ParseNodeFree(pLeft);
     sqlite3Fts5ParseNodeFree(pRight);
     sqlite3Fts5ParseNearsetFree(pNear);
   }
+  return pRet;
+}
+
+Fts5ExprNode *sqlite3Fts5ParseImplicitAnd(
+  Fts5Parse *pParse,              /* Parse context */
+  Fts5ExprNode *pLeft,            /* Left hand child expression */
+  Fts5ExprNode *pRight            /* Right hand child expression */
+){
+  Fts5ExprNode *pRet = 0;
+  Fts5ExprNode *pPrev;
+
+  if( pParse->rc ){
+    sqlite3Fts5ParseNodeFree(pLeft);
+    sqlite3Fts5ParseNodeFree(pRight);
+  }else{
+
+    assert( pLeft->eType==FTS5_STRING 
+        || pLeft->eType==FTS5_TERM
+        || pLeft->eType==FTS5_EOF
+        || pLeft->eType==FTS5_AND
+    );
+    assert( pRight->eType==FTS5_STRING 
+        || pRight->eType==FTS5_TERM 
+        || pRight->eType==FTS5_EOF 
+    );
+
+    if( pLeft->eType==FTS5_AND ){
+      pPrev = pLeft->apChild[pLeft->nChild-1];
+    }else{
+      pPrev = pLeft;
+    }
+    assert( pPrev->eType==FTS5_STRING 
+        || pPrev->eType==FTS5_TERM 
+        || pPrev->eType==FTS5_EOF 
+        );
+
+    if( pRight->eType==FTS5_EOF ){
+      assert( pParse->apPhrase[pParse->nPhrase-1]==pRight->pNear->apPhrase[0] );
+      sqlite3Fts5ParseNodeFree(pRight);
+      pRet = pLeft;
+      pParse->nPhrase--;
+    }
+    else if( pPrev->eType==FTS5_EOF ){
+      Fts5ExprPhrase **ap;
+
+      if( pPrev==pLeft ){
+        pRet = pRight;
+      }else{
+        pLeft->apChild[pLeft->nChild-1] = pRight;
+        pRet = pLeft;
+      }
+
+      ap = &pParse->apPhrase[pParse->nPhrase-1-pRight->pNear->nPhrase];
+      assert( ap[0]==pPrev->pNear->apPhrase[0] );
+      memmove(ap, &ap[1], sizeof(Fts5ExprPhrase*)*pRight->pNear->nPhrase);
+      pParse->nPhrase--;
+
+      sqlite3Fts5ParseNodeFree(pPrev);
+    }
+    else{
+      pRet = sqlite3Fts5ParseNode(pParse, FTS5_AND, pLeft, pRight, 0);
+    }
+  }
+
   return pRet;
 }
 
 static char *fts5ExprTermPrint(Fts5ExprTerm *pTerm){
   int nByte = 0;
@@ -2060,10 +2152,13 @@
   return zRet;
 }
 
 static char *fts5ExprPrint(Fts5Config *pConfig, Fts5ExprNode *pExpr){
   char *zRet = 0;
+  if( pExpr->eType==0 ){
+    return sqlite3_mprintf("\"\"");
+  }else
   if( pExpr->eType==FTS5_STRING || pExpr->eType==FTS5_TERM ){
     Fts5ExprNearset *pNear = pExpr->pNear;
     int i; 
     int iTerm;
 
@@ -2120,11 +2215,11 @@
       if( z==0 ){
         sqlite3_free(zRet);
         zRet = 0;
       }else{
         int e = pExpr->apChild[i]->eType;
-        int b = (e!=FTS5_STRING && e!=FTS5_TERM);
+        int b = (e!=FTS5_STRING && e!=FTS5_TERM && e!=FTS5_EOF);
         zRet = fts5PrintfAppend(zRet, "%s%s%z%s", 
             (i==0 ? "" : zOp),
             (b?"(":""), z, (b?")":"")
         );
       }

Index: ext/fts5/fts5_index.c
==================================================================
--- ext/fts5/fts5_index.c
+++ ext/fts5/fts5_index.c
@@ -4177,17 +4177,21 @@
   if( pnRem ) *pnRem -= writer.nLeafWritten;
 }
 
 /*
 ** Do up to nPg pages of automerge work on the index.
+**
+** Return true if any changes were actually made, or false otherwise.
 */
-static void fts5IndexMerge(
+static int fts5IndexMerge(
   Fts5Index *p,                   /* FTS5 backend object */
   Fts5Structure **ppStruct,       /* IN/OUT: Current structure of index */
-  int nPg                         /* Pages of work to do */
+  int nPg,                        /* Pages of work to do */
+  int nMin                        /* Minimum number of segments to merge */
 ){
   int nRem = nPg;
+  int bRet = 0;
   Fts5Structure *pStruct = *ppStruct;
   while( nRem>0 && p->rc==SQLITE_OK ){
     int iLvl;                   /* To iterate through levels */
     int iBestLvl = 0;           /* Level offering the most input segments */
     int nBest = 0;              /* Number of input segments on best level */
@@ -4214,21 +4218,21 @@
     for(iLvl=0; nBest==0 && iLvl<pStruct->nLevel; iLvl++){
       assert( pStruct->aLevel[iLvl].nSeg==0 );
     }
 #endif
 
-    if( nBest<p->pConfig->nAutomerge 
-        && pStruct->aLevel[iBestLvl].nMerge==0 
-      ){
+    if( nBest<nMin && pStruct->aLevel[iBestLvl].nMerge==0 ){
       break;
     }
+    bRet = 1;
     fts5IndexMergeLevel(p, &pStruct, iBestLvl, &nRem);
     if( p->rc==SQLITE_OK && pStruct->aLevel[iBestLvl].nMerge==0 ){
       fts5StructurePromote(p, iBestLvl+1, pStruct);
     }
   }
   *ppStruct = pStruct;
+  return bRet;
 }
 
 /*
 ** A total of nLeaf leaf pages of data has just been flushed to a level-0
 ** segment. This function updates the write-counter accordingly and, if
@@ -4252,11 +4256,11 @@
     nWrite = pStruct->nWriteCounter;
     nWork = (int)(((nWrite + nLeaf) / p->nWorkUnit) - (nWrite / p->nWorkUnit));
     pStruct->nWriteCounter += nLeaf;
     nRem = (int)(p->nWorkUnit * nWork * pStruct->nLevel);
 
-    fts5IndexMerge(p, ppStruct, nRem);
+    fts5IndexMerge(p, ppStruct, nRem, p->pConfig->nAutomerge);
   }
 }
 
 static void fts5IndexCrisismerge(
   Fts5Index *p,                   /* FTS5 backend object */
@@ -4472,29 +4476,42 @@
     p->nPendingData = 0;
     fts5FlushOneHash(p);
   }
 }
 
-
-int sqlite3Fts5IndexOptimize(Fts5Index *p){
-  Fts5Structure *pStruct;
+static Fts5Structure *fts5IndexOptimizeStruct(
+  Fts5Index *p, 
+  Fts5Structure *pStruct
+){
   Fts5Structure *pNew = 0;
-  int nSeg = 0;
-
-  assert( p->rc==SQLITE_OK );
-  fts5IndexFlush(p);
-  pStruct = fts5StructureRead(p);
-
-  if( pStruct ){
-    assert( pStruct->nSegment==fts5StructureCountSegments(pStruct) );
-    nSeg = pStruct->nSegment;
-    if( nSeg>1 ){
-      int nByte = sizeof(Fts5Structure);
-      nByte += (pStruct->nLevel+1) * sizeof(Fts5StructureLevel);
-      pNew = (Fts5Structure*)sqlite3Fts5MallocZero(&p->rc, nByte);
-    }
-  }
+  int nByte = sizeof(Fts5Structure);
+  int nSeg = pStruct->nSegment;
+  int i;
+
+  /* Figure out if this structure requires optimization. A structure does
+  ** not require optimization if either:
+  **
+  **  + it consists of fewer than two segments, or 
+  **  + all segments are on the same level, or
+  **  + all segments except one are currently inputs to a merge operation.
+  **
+  ** In the first case, return NULL. In the second, increment the ref-count
+  ** on *pStruct and return a copy of the pointer to it.
+  */
+  if( nSeg<2 ) return 0;
+  for(i=0; i<pStruct->nLevel; i++){
+    int nThis = pStruct->aLevel[i].nSeg;
+    if( nThis==nSeg || (nThis==nSeg-1 && pStruct->aLevel[i].nMerge==nThis) ){
+      fts5StructureRef(pStruct);
+      return pStruct;
+    }
+    assert( pStruct->aLevel[i].nMerge<=nThis );
+  }
+
+  nByte += (pStruct->nLevel+1) * sizeof(Fts5StructureLevel);
+  pNew = (Fts5Structure*)sqlite3Fts5MallocZero(&p->rc, nByte);
+
   if( pNew ){
     Fts5StructureLevel *pLvl;
     int nByte = nSeg * sizeof(Fts5StructureSegment);
     pNew->nLevel = pStruct->nLevel+1;
     pNew->nRef = 1;
@@ -4518,35 +4535,64 @@
       sqlite3_free(pNew);
       pNew = 0;
     }
   }
 
+  return pNew;
+}
+
+int sqlite3Fts5IndexOptimize(Fts5Index *p){
+  Fts5Structure *pStruct;
+  Fts5Structure *pNew = 0;
+
+  assert( p->rc==SQLITE_OK );
+  fts5IndexFlush(p);
+  pStruct = fts5StructureRead(p);
+
+  if( pStruct ){
+    pNew = fts5IndexOptimizeStruct(p, pStruct);
+  }
+  fts5StructureRelease(pStruct);
+
+  assert( pNew==0 || pNew->nSegment>0 );
   if( pNew ){
-    int iLvl = pNew->nLevel-1;
+    int iLvl;
+    for(iLvl=0; pNew->aLevel[iLvl].nSeg==0; iLvl++){}
     while( p->rc==SQLITE_OK && pNew->aLevel[iLvl].nSeg>0 ){
       int nRem = FTS5_OPT_WORK_UNIT;
       fts5IndexMergeLevel(p, &pNew, iLvl, &nRem);
     }
 
     fts5StructureWrite(p, pNew);
     fts5StructureRelease(pNew);
   }
 
-  fts5StructureRelease(pStruct);
   return fts5IndexReturn(p); 
 }
 
+/*
+** This is called to implement the special "VALUES('merge', $nMerge)"
+** INSERT command.
+*/
 int sqlite3Fts5IndexMerge(Fts5Index *p, int nMerge){
-  Fts5Structure *pStruct;
-
-  pStruct = fts5StructureRead(p);
-  if( pStruct && pStruct->nLevel ){
-    fts5IndexMerge(p, &pStruct, nMerge);
-    fts5StructureWrite(p, pStruct);
-  }
-  fts5StructureRelease(pStruct);
-
+  Fts5Structure *pStruct = fts5StructureRead(p);
+  if( pStruct ){
+    int nMin = p->pConfig->nUsermerge;
+    if( nMerge<0 ){
+      Fts5Structure *pNew = fts5IndexOptimizeStruct(p, pStruct);
+      fts5StructureRelease(pStruct);
+      pStruct = pNew;
+      nMin = 2;
+      nMerge = nMerge*-1;
+    }
+    if( pStruct && pStruct->nLevel ){
+      if( fts5IndexMerge(p, &pStruct, nMerge, nMin) ){
+        fts5StructureWrite(p, pStruct);
+      }
+    }
+    fts5StructureRelease(pStruct);
+  }
   return fts5IndexReturn(p);
 }
 
 static void fts5AppendRowid(
   Fts5Index *p,

Index: ext/fts5/fts5_main.c
==================================================================
--- ext/fts5/fts5_main.c
+++ ext/fts5/fts5_main.c
@@ -1509,17 +1509,17 @@
           (nArg>1 ? "UPDATE" : "DELETE from"), pConfig->zName
       );
       rc = SQLITE_ERROR;
     }
 
-    /* Case 1: DELETE */
+    /* DELETE */
     else if( nArg==1 ){
       i64 iDel = sqlite3_value_int64(apVal[0]);  /* Rowid to delete */
       rc = sqlite3Fts5StorageDelete(pTab->pStorage, iDel, 0);
     }
 
-    /* Case 2: INSERT */
+    /* INSERT */
     else if( eType0!=SQLITE_INTEGER ){     
       /* If this is a REPLACE, first remove the current entry (if any) */
       if( eConflict==SQLITE_REPLACE 
        && sqlite3_value_type(apVal[1])==SQLITE_INTEGER 
       ){
@@ -1527,11 +1527,11 @@
         rc = sqlite3Fts5StorageDelete(pTab->pStorage, iNew, 0);
       }
       fts5StorageInsert(&rc, pTab, apVal, pRowid);
     }
 
-    /* Case 2: UPDATE */
+    /* UPDATE */
     else{
       i64 iOld = sqlite3_value_int64(apVal[0]);  /* Old rowid */
       i64 iNew = sqlite3_value_int64(apVal[1]);  /* New rowid */
       if( iOld!=iNew ){
         if( eConflict==SQLITE_REPLACE ){

Index: ext/fts5/fts5_test_mi.c
==================================================================
--- ext/fts5/fts5_test_mi.c
+++ ext/fts5/fts5_test_mi.c
@@ -66,22 +66,26 @@
 /*
 ** Return a pointer to the fts5_api pointer for database connection db.
 ** If an error occurs, return NULL and leave an error in the database 
 ** handle (accessible using sqlite3_errcode()/errmsg()).
 */
-static fts5_api *fts5_api_from_db(sqlite3 *db){
-  fts5_api *pRet = 0;
+static int fts5_api_from_db(sqlite3 *db, fts5_api **ppApi){
   sqlite3_stmt *pStmt = 0;
-
-  if( SQLITE_OK==sqlite3_prepare(db, "SELECT fts5()", -1, &pStmt, 0)
-   && SQLITE_ROW==sqlite3_step(pStmt) 
-   && sizeof(pRet)==sqlite3_column_bytes(pStmt, 0)
-  ){
-    memcpy(&pRet, sqlite3_column_blob(pStmt, 0), sizeof(pRet));
-  }
-  sqlite3_finalize(pStmt);
-  return pRet;
+  int rc;
+
+  *ppApi = 0;
+  rc = sqlite3_prepare(db, "SELECT fts5()", -1, &pStmt, 0);
+  if( rc==SQLITE_OK ){
+    if( SQLITE_ROW==sqlite3_step(pStmt) 
+        && sizeof(fts5_api*)==sqlite3_column_bytes(pStmt, 0)
+      ){
+      memcpy(ppApi, sqlite3_column_blob(pStmt, 0), sizeof(fts5_api*));
+    }
+    rc = sqlite3_finalize(pStmt);
+  }
+
+  return rc;
 }
 
 
 /*
 ** Argument f should be a flag accepted by matchinfo() (a valid character
@@ -397,11 +401,12 @@
   fts5_api *pApi;                 /* FTS5 API functions */
 
   /* Extract the FTS5 API pointer from the database handle. The 
   ** fts5_api_from_db() function above is copied verbatim from the 
   ** FTS5 documentation. Refer there for details. */
-  pApi = fts5_api_from_db(db);
+  rc = fts5_api_from_db(db, &pApi);
+  if( rc!=SQLITE_OK ) return rc;
 
   /* If fts5_api_from_db() returns NULL, then either FTS5 is not registered
   ** with this database handle, or an error (OOM perhaps?) has occurred.
   **
   ** Also check that the fts5_api object is version 2 or newer.  

Index: ext/fts5/fts5parse.y
==================================================================
--- ext/fts5/fts5parse.y
+++ ext/fts5/fts5parse.y
@@ -102,11 +102,11 @@
 expr(A) ::= LP expr(X) RP. {A = X;}
 expr(A) ::= exprlist(X).   {A = X;}
 
 exprlist(A) ::= cnearset(X). {A = X;}
 exprlist(A) ::= exprlist(X) cnearset(Y). {
-  A = sqlite3Fts5ParseNode(pParse, FTS5_AND, X, Y, 0);
+  A = sqlite3Fts5ParseImplicitAnd(pParse, X, Y);
 }
 
 cnearset(A) ::= nearset(X). { 
   A = sqlite3Fts5ParseNode(pParse, FTS5_STRING, 0, 0, X); 
 }

Index: ext/fts5/test/fts5_common.tcl
==================================================================
--- ext/fts5/test/fts5_common.tcl
+++ ext/fts5/test/fts5_common.tcl
@@ -156,10 +156,16 @@
     fts5_test_phrasecount
   } {
     sqlite3_fts5_create_function $db $f $f
   }
 }
+
+proc fts5_segcount {tbl} {
+  set N 0
+  foreach n [fts5_level_segs $tbl] { incr N $n }
+  set N
+}
 
 proc fts5_level_segs {tbl} {
   set sql "SELECT fts5_decode(rowid,block) aS r FROM ${tbl}_data WHERE rowid=10"
   set ret [list]
   foreach L [lrange [db one $sql] 1 end] {

Index: ext/fts5/test/fts5config.test
==================================================================
--- ext/fts5/test/fts5config.test
+++ ext/fts5/test/fts5config.test
@@ -244,8 +244,24 @@
 }
 
 do_catchsql_test 12.1 {
   INSERT INTO t1(t1, rank) VALUES('rank', NULL);;
 } {1 {SQL logic error or missing database}}
+
+#-------------------------------------------------------------------------
+# errors in the 'usermerge' option
+#
+do_execsql_test 13.0 {
+  CREATE VIRTUAL TABLE tt USING fts5(ttt);
+}
+foreach {tn val} {
+  1     -1
+  2     4.2
+  3     17
+  4     1
+} {
+  set sql "INSERT INTO tt(tt, rank) VALUES('usermerge', $val)"
+  do_catchsql_test 13.$tn $sql {1 {SQL logic error or missing database}}
+}
 
 finish_test
 

Index: ext/fts5/test/fts5eb.test
==================================================================
--- ext/fts5/test/fts5eb.test
+++ ext/fts5/test/fts5eb.test
@@ -31,16 +31,16 @@
 
 foreach {tn expr res} {
   1  {abc}                            {"abc"}
   2  {abc ""}                         {"abc"}
   3  {""}                             {}
-  4  {abc OR ""}                      {"abc"}
-  5  {abc NOT ""}                     {"abc"}
-  6  {abc AND ""}                     {"abc"}
-  7  {"" OR abc}                      {"abc"}
-  8  {"" NOT abc}                     {"abc"}
-  9  {"" AND abc}                     {"abc"}
+  4  {abc OR ""}                      {"abc" OR ""}
+  5  {abc NOT ""}                     {"abc" NOT ""}
+  6  {abc AND ""}                     {"abc" AND ""}
+  7  {"" OR abc}                      {"" OR "abc"}
+  8  {"" NOT abc}                     {"" NOT "abc"}
+  9  {"" AND abc}                     {"" AND "abc"}
   10 {abc + "" + def}                 {"abc" + "def"}
   11 {abc "" def}                     {"abc" AND "def"}
   12 {r+e OR w}                       {"r" + "e" OR "w"}
 
   13 {a AND b NOT c}                  {"a" AND ("b" NOT "c")}

Index: ext/fts5/test/fts5fault8.test
==================================================================
--- ext/fts5/test/fts5fault8.test
+++ ext/fts5/test/fts5fault8.test
@@ -52,9 +52,34 @@
       execsql { SELECT rowid FROM t1('b:2') }
     } -test {
       faultsim_test_result {0 {1 3}} {1 SQLITE_NOMEM}
     }
   }
+
 } ;# foreach_detail_mode...
+
+
+do_execsql_test 4.0 {
+  CREATE VIRTUAL TABLE x2 USING fts5(a);
+  INSERT INTO x2(x2, rank) VALUES('crisismerge', 2);
+  INSERT INTO x2(x2, rank) VALUES('pgsz', 32);
+  INSERT INTO x2 VALUES('a b c d');
+  INSERT INTO x2 VALUES('e f g h');
+  INSERT INTO x2 VALUES('i j k l');
+  INSERT INTO x2 VALUES('m n o p');
+  INSERT INTO x2 VALUES('q r s t');
+  INSERT INTO x2 VALUES('u v w x');
+  INSERT INTO x2 VALUES('y z a b');
+}
+faultsim_save_and_close
+
+do_faultsim_test 4 -faults oom-* -prep {
+  faultsim_restore_and_reopen
+} -body {
+  execsql { INSERT INTO x2(x2) VALUES('optimize') }
+} -test {
+  faultsim_test_result {0 {}} {1 SQLITE_NOMEM}
+}
+
 
 finish_test
 

ADDED   ext/fts5/test/fts5fuzz1.test
Index: ext/fts5/test/fts5fuzz1.test
==================================================================
--- /dev/null
+++ ext/fts5/test/fts5fuzz1.test
@@ -0,0 +1,93 @@
+# 2014 June 17
+#
+# The author disclaims copyright to this source code.  In place of
+# a legal notice, here is a blessing:
+#
+#    May you do good and not evil.
+#    May you find forgiveness for yourself and forgive others.
+#    May you share freely, never taking more than you give.
+#
+#*************************************************************************
+# This file implements regression tests for SQLite library.  The
+# focus of this script is testing the FTS5 module.
+#
+
+source [file join [file dirname [info script]] fts5_common.tcl]
+return_if_no_fts5
+set testprefix fts5fuzz1
+
+
+#-------------------------------------------------------------------------
+reset_db
+do_catchsql_test 1.1 {
+  CREATE VIRTUAL TABLE f1 USING fts5(a b);
+} {/1 {parse error in.*}/}
+
+
+#-------------------------------------------------------------------------
+reset_db
+do_execsql_test 2.1 {
+  CREATE VIRTUAL TABLE f1 USING fts5(a, b);
+  INSERT INTO f1 VALUES('a b', 'c d');
+  INSERT INTO f1 VALUES('e f', 'a b');
+}
+
+do_execsql_test 2.2.1 {
+  SELECT rowid FROM f1('""');
+} {}
+
+do_execsql_test 2.2.2 {
+  SELECT rowid FROM f1('"" AND a');
+} {}
+
+
+do_execsql_test 2.2.3 {
+  SELECT rowid FROM f1('"" a');
+} {1 2}
+
+do_execsql_test 2.2.4 {
+  SELECT rowid FROM f1('"" OR a');
+} {1 2}
+
+do_execsql_test 2.3 {
+  SELECT a, b FROM f1('NEAR("")');
+} {}
+
+do_execsql_test 2.4 {
+  SELECT a, b FROM f1('NEAR("", 5)');
+} {}
+
+do_execsql_test 2.5 {
+  SELECT a, b FROM f1('NEAR("" c, 5)');
+} {{a b} {c d}}
+
+do_execsql_test 2.6 {
+  SELECT a, b FROM f1('NEAR("" c d, 5)');
+} {{a b} {c d}}
+
+do_execsql_test 2.7 {
+  SELECT a, b FROM f1('NEAR(c d, 5)');
+} {{a b} {c d}}
+
+do_execsql_test 2.8 {
+  SELECT rowid FROM f1('NEAR("a" "b", 5)');
+} {1 2}
+
+#-------------------------------------------------------------------------
+reset_db
+do_execsql_test 3.2 {
+  CREATE VIRTUAL TABLE f2 USING fts5(o, t, tokenize="ascii separators abc");
+  SELECT * FROM f2('a+4');
+} {}
+
+
+
+#-------------------------------------------------------------------------
+reset_db
+do_catchsql_test 4.1 {
+  CREATE VIRTUAL TABLE f2 USING fts5(o, t);
+  SELECT * FROM f2('(8 AND 9)`AND 10');
+} {1 {fts5: syntax error near "`"}}
+
+finish_test
+

Index: ext/fts5/test/fts5merge.test
==================================================================
--- ext/fts5/test/fts5merge.test
+++ ext/fts5/test/fts5merge.test
@@ -43,11 +43,11 @@
       INSERT INTO x8 SELECT repeat('x y ', i % 16) FROM ii;
 
     WITH ii(i) AS (SELECT 1 UNION ALL SELECT i+1 FROM ii WHERE i<$::nRowPerSeg)
       INSERT INTO x8 SELECT repeat('x y ', i % 16) FROM ii;
 
-    INSERT INTO x8(x8, rank) VALUES('automerge', 2);
+    INSERT INTO x8(x8, rank) VALUES('usermerge', 2);
   }
 
   for {set tn 1} {[lindex [fts5_level_segs x8] 0]>0} {incr tn} {
     do_execsql_test $testname.$tn {
       INSERT INTO x8(x8, rank) VALUES('merge', 1);
@@ -82,13 +82,13 @@
   do_test $testname.1 {
     for {set i 0} {$i < $::nRow} {incr i} {
       execsql { INSERT INTO x8 VALUES( rnddoc(($i%16) + 5) ) }
       while {[not_merged x8]} {
         execsql {
-          INSERT INTO x8(x8, rank) VALUES('automerge', 2);
+          INSERT INTO x8(x8, rank) VALUES('usermerge', 2);
           INSERT INTO x8(x8, rank) VALUES('merge', 1);
-          INSERT INTO x8(x8, rank) VALUES('automerge', 16);
+          INSERT INTO x8(x8, rank) VALUES('usermerge', 16);
           INSERT INTO x8(x8) VALUES('integrity-check');
         }
       }
     }
   } {}
@@ -102,13 +102,13 @@
 do_merge2_test 2.1    5
 do_merge2_test 2.2   10
 do_merge2_test 2.3   20
 
 #-------------------------------------------------------------------------
-# Test that an auto-merge will complete any merge that has already been
+# Test that a merge will complete any merge that has already been
 # started, even if the number of input segments is less than the current
-# value of the 'automerge' configuration parameter.
+# value of the 'usermerge' configuration parameter.
 #
 db func rnddoc fts5_rnddoc
 
 do_execsql_test 3.1 {
   DROP TABLE IF EXISTS x8;
@@ -117,26 +117,26 @@
   INSERT INTO x8 VALUES(rnddoc(100));
   INSERT INTO x8 VALUES(rnddoc(100));
 }
 do_test 3.2 {
   execsql {
-    INSERT INTO x8(x8, rank) VALUES('automerge', 4);
+    INSERT INTO x8(x8, rank) VALUES('usermerge', 4);
     INSERT INTO x8(x8, rank) VALUES('merge', 1);
   }
   fts5_level_segs x8
 } {2}
 
 do_test 3.3 {
   execsql {
-    INSERT INTO x8(x8, rank) VALUES('automerge', 2);
+    INSERT INTO x8(x8, rank) VALUES('usermerge', 2);
     INSERT INTO x8(x8, rank) VALUES('merge', 1);
   }
   fts5_level_segs x8
 } {2 1}
 
 do_test 3.4 {
-  execsql { INSERT INTO x8(x8, rank) VALUES('automerge', 4) }
+  execsql { INSERT INTO x8(x8, rank) VALUES('usermerge', 4) }
   while {[not_merged x8]} {
     execsql { INSERT INTO x8(x8, rank) VALUES('merge', 1) }
   }
   fts5_level_segs x8
 } {0 1}
@@ -174,11 +174,11 @@
   do_execsql_test 4.$tn.3 {
     WITH ii(i) AS (SELECT 1 UNION ALL SELECT i+1 FROM ii WHERE i<100)
       INSERT INTO x8 SELECT mydoc() FROM ii;
     WITH ii(i) AS (SELECT 1 UNION ALL SELECT i+1 FROM ii WHERE i<100)
       INSERT INTO x8 SELECT mydoc() FROM ii;
-    INSERT INTO x8(x8, rank) VALUES('automerge', 2);
+    INSERT INTO x8(x8, rank) VALUES('usermerge', 2);
   }
 
   set expect [mycount]
     for {set i 0} {$i < 20} {incr i} {
       do_test 4.$tn.4.$i {
@@ -187,8 +187,58 @@
       } $expect
       break
     }
 #  db eval {SELECT fts5_decode(rowid, block) AS r FROM x8_data} { puts $r }
 }
+
+#-------------------------------------------------------------------------
+# Test that the 'merge' command does not modify the database if there is
+# no work to do. 
+
+do_execsql_test 5.1 {
+  CREATE VIRTUAL TABLE x9 USING fts5(one, two);
+  INSERT INTO x9(x9, rank) VALUES('pgsz', 32);
+  INSERT INTO x9(x9, rank) VALUES('automerge', 2);
+  INSERT INTO x9(x9, rank) VALUES('usermerge', 2);
+  INSERT INTO x9 VALUES(rnddoc(100), rnddoc(100));
+  INSERT INTO x9 VALUES(rnddoc(100), rnddoc(100));
+  INSERT INTO x9 VALUES(rnddoc(100), rnddoc(100));
+  INSERT INTO x9 VALUES(rnddoc(100), rnddoc(100));
+  INSERT INTO x9 VALUES(rnddoc(100), rnddoc(100));
+  INSERT INTO x9 VALUES(rnddoc(100), rnddoc(100));
+  INSERT INTO x9 VALUES(rnddoc(100), rnddoc(100));
+  INSERT INTO x9 VALUES(rnddoc(100), rnddoc(100));
+}
+
+do_test 5.2 {
+  while 1 {
+    set nChange [db total_changes]
+    execsql { INSERT INTO x9(x9, rank) VALUES('merge', 1); }
+    set nChange [expr [db total_changes] - $nChange]
+    #puts $nChange
+    if {$nChange<2} break
+  }
+} {}
+
+
+#--------------------------------------------------------------------------
+# Test that running 'merge' on an empty database does not cause a 
+# problem.
+#
+reset_db
+do_execsql_test 6.0 {
+  CREATE VIRTUAL TABLE g1 USING fts5(a, b);
+}
+do_execsql_test 6.1 {
+  INSERT INTO g1(g1, rank) VALUES('merge', 10);
+}
+do_execsql_test 6.2 {
+  INSERT INTO g1(g1, rank) VALUES('merge', -10);
+}
+do_execsql_test 6.3 {
+  INSERT INTO g1(g1) VALUES('integrity-check');
+}
+
+
 
 finish_test
 

Index: ext/fts5/test/fts5optimize.test
==================================================================
--- ext/fts5/test/fts5optimize.test
+++ ext/fts5/test/fts5optimize.test
@@ -17,10 +17,16 @@
 # If SQLITE_ENABLE_FTS5 is defined, omit this file.
 ifcapable !fts5 {
   finish_test
   return
 }
+
+#
+# 1.* - Warm body tests for index optimization using ('optimize')
+#
+# 2.* - Warm body tests for index optimization using ('merge', -1)
+#
 
 proc rnddoc {nWord} {
   set vocab {a b c d e f g h i j k l m n o p q r s t u v w x y z}
   set nVocab [llength $vocab]
   set ret [list]
@@ -28,18 +34,16 @@
     lappend ret [lindex $vocab [expr {int(rand() * $nVocab)}]]
   }
   return $ret
 }
 
-
 foreach {tn nStep} {
   1 2
   2 10
   3 50
   4 500
 } {
-if {$tn!=4} continue
   reset_db
   db func rnddoc rnddoc
   do_execsql_test 1.$tn.1 {
     CREATE VIRTUAL TABLE t1 USING fts5(x, y);
   }
@@ -58,9 +62,48 @@
   }
 
   do_execsql_test 1.$tn.5 {
     INSERT INTO t1(t1) VALUES('integrity-check');
   }
+
+  do_test 1.$tn.6 { fts5_segcount t1 } 1
 }
 
+foreach {tn nStep} {
+  1 2
+  2 10
+  3 50
+  4 500
+} {
+  reset_db
+  db func rnddoc rnddoc
+  do_execsql_test 1.$tn.1 {
+    CREATE VIRTUAL TABLE t1 USING fts5(x, y);
+  }
+  do_test 2.$tn.2 {
+    for {set i 0} {$i < $nStep} {incr i} {
+      execsql { INSERT INTO t1 VALUES( rnddoc(5), rnddoc(5) ) }
+    }
+  } {}
+
+  do_execsql_test 2.$tn.3 {
+    INSERT INTO t1(t1) VALUES('integrity-check');
+  }
+
+  do_test 2.$tn.4 {
+    execsql { INSERT INTO t1(t1, rank) VALUES('merge', -1) }
+    while 1 {
+      set c [db total_changes]
+      execsql { INSERT INTO t1(t1, rank) VALUES('merge', 1) }
+      set c [expr [db total_changes]-$c]
+      if {$c<2} break
+    }
+  } {}
+
+  do_execsql_test 2.$tn.5 {
+    INSERT INTO t1(t1) VALUES('integrity-check');
+  }
+
+  do_test 2.$tn.6 { fts5_segcount t1 } 1
+}
 finish_test
 

Index: ext/misc/spellfix.c
==================================================================
--- ext/misc/spellfix.c
+++ ext/misc/spellfix.c
@@ -1732,10 +1732,11 @@
   const unsigned char *zIn = sqlite3_value_text(argv[0]);
   int nIn = sqlite3_value_bytes(argv[0]);
   int c, sz;
   int scriptMask = 0;
   int res;
+  int seenDigit = 0;
 # define SCRIPT_LATIN       0x0001
 # define SCRIPT_CYRILLIC    0x0002
 # define SCRIPT_GREEK       0x0004
 # define SCRIPT_HEBREW      0x0008
 # define SCRIPT_ARABIC      0x0010
@@ -1742,12 +1743,16 @@
 
   while( nIn>0 ){
     c = utf8Read(zIn, nIn, &sz);
     zIn += sz;
     nIn -= sz;
-    if( c<0x02af && (c>=0x80 || midClass[c&0x7f]<CCLASS_DIGIT) ){
-      scriptMask |= SCRIPT_LATIN;
+    if( c<0x02af ){
+      if( c>=0x80 || midClass[c&0x7f]<CCLASS_DIGIT ){
+        scriptMask |= SCRIPT_LATIN;
+      }else if( c>='0' && c<='9' ){
+        seenDigit = 1;
+      }
     }else if( c>=0x0400 && c<=0x04ff ){
       scriptMask |= SCRIPT_CYRILLIC;
     }else if( c>=0x0386 && c<=0x03ce ){
       scriptMask |= SCRIPT_GREEK;
     }else if( c>=0x0590 && c<=0x05ff ){
@@ -1754,10 +1759,11 @@
       scriptMask |= SCRIPT_HEBREW;
     }else if( c>=0x0600 && c<=0x06ff ){
       scriptMask |= SCRIPT_ARABIC;
     }
   }
+  if( scriptMask==0 && seenDigit ) scriptMask = SCRIPT_LATIN;
   switch( scriptMask ){
     case 0:                res = 999; break;
     case SCRIPT_LATIN:     res = 215; break;
     case SCRIPT_CYRILLIC:  res = 220; break;
     case SCRIPT_GREEK:     res = 200; break;

Index: src/expr.c
==================================================================
--- src/expr.c
+++ src/expr.c
@@ -1566,27 +1566,26 @@
   if( sqlite3StrICmp(z, "OID")==0 ) return 1;
   return 0;
 }
 
 /*
-** Return true if we are able to the IN operator optimization on a
-** query of the form
-**
-**       x IN (SELECT ...)
-**
-** Where the SELECT... clause is as specified by the parameter to this
-** routine.
-**
-** The Select object passed in has already been preprocessed and no
-** errors have been found.
+** pX is the RHS of an IN operator.  If pX is a SELECT statement 
+** that can be simplified to a direct table access, then return
+** a pointer to the SELECT statement.  If pX is not a SELECT statement,
+** or if the SELECT statement needs to be manifested into a transient
+** table, then return NULL.
 */
 #ifndef SQLITE_OMIT_SUBQUERY
-static int isCandidateForInOpt(Select *p){
+static Select *isCandidateForInOpt(Expr *pX){
+  Select *p;
   SrcList *pSrc;
   ExprList *pEList;
+  Expr *pRes;
   Table *pTab;
-  if( p==0 ) return 0;                   /* right-hand side of IN is SELECT */
+  if( !ExprHasProperty(pX, EP_xIsSelect) ) return 0;  /* Not a subquery */
+  if( ExprHasProperty(pX, EP_VarSelect)  ) return 0;  /* Correlated subq */
+  p = pX->x.pSelect;
   if( p->pPrior ) return 0;              /* Not a compound SELECT */
   if( p->selFlags & (SF_Distinct|SF_Aggregate) ){
     testcase( (p->selFlags & (SF_Distinct|SF_Aggregate))==SF_Distinct );
     testcase( (p->selFlags & (SF_Distinct|SF_Aggregate))==SF_Aggregate );
     return 0; /* No DISTINCT keyword and no aggregate functions */
@@ -1598,17 +1597,19 @@
   pSrc = p->pSrc;
   assert( pSrc!=0 );
   if( pSrc->nSrc!=1 ) return 0;          /* Single term in FROM clause */
   if( pSrc->a[0].pSelect ) return 0;     /* FROM is not a subquery or view */
   pTab = pSrc->a[0].pTab;
-  if( NEVER(pTab==0) ) return 0;
+  assert( pTab!=0 );
   assert( pTab->pSelect==0 );            /* FROM clause is not a view */
   if( IsVirtual(pTab) ) return 0;        /* FROM clause not a virtual table */
   pEList = p->pEList;
   if( pEList->nExpr!=1 ) return 0;       /* One column in the result set */
-  if( pEList->a[0].pExpr->op!=TK_COLUMN ) return 0; /* Result is a column */
-  return 1;
+  pRes = pEList->a[0].pExpr;
+  if( pRes->op!=TK_COLUMN ) return 0;    /* Result is a column */
+  assert( pRes->iTable==pSrc->a[0].iCursor );  /* Not a correlated subquery */
+  return p;
 }
 #endif /* SQLITE_OMIT_SUBQUERY */
 
 /*
 ** Code an OP_Once instruction and allocate space for its flag. Return the 
@@ -1736,19 +1737,17 @@
 
   /* Check to see if an existing table or index can be used to
   ** satisfy the query.  This is preferable to generating a new 
   ** ephemeral table.
   */
-  p = (ExprHasProperty(pX, EP_xIsSelect) ? pX->x.pSelect : 0);
-  if( pParse->nErr==0 && isCandidateForInOpt(p) ){
+  if( pParse->nErr==0 && (p = isCandidateForInOpt(pX))!=0 ){
     sqlite3 *db = pParse->db;              /* Database connection */
     Table *pTab;                           /* Table <table>. */
     Expr *pExpr;                           /* Expression <column> */
     i16 iCol;                              /* Index of column <column> */
     i16 iDb;                               /* Database idx for pTab */
 
-    assert( p );                        /* Because of isCandidateForInOpt(p) */
     assert( p->pEList!=0 );             /* Because of isCandidateForInOpt(p) */
     assert( p->pEList->a[0].pExpr!=0 ); /* Because of isCandidateForInOpt(p) */
     assert( p->pSrc!=0 );               /* Because of isCandidateForInOpt(p) */
     pTab = p->pSrc->a[0].pTab;
     pExpr = p->pEList->a[0].pExpr;

Index: src/pager.c
==================================================================
--- src/pager.c
+++ src/pager.c
@@ -7165,10 +7165,11 @@
 ** Return true if the underlying VFS for the given pager supports the
 ** primitives necessary for write-ahead logging.
 */
 int sqlite3PagerWalSupported(Pager *pPager){
   const sqlite3_io_methods *pMethods = pPager->fd->pMethods;
+  if( pPager->noLock ) return 0;
   return pPager->exclusiveMode || (pMethods->iVersion>=2 && pMethods->xShmMap);
 }
 
 /*
 ** Attempt to take an exclusive lock on the database file. If a PENDING lock

Index: src/sqliteInt.h
==================================================================
--- src/sqliteInt.h
+++ src/sqliteInt.h
@@ -449,10 +449,17 @@
 # define SQLITE_NEED_ERR_NAME
 #else
 # undef  SQLITE_NEED_ERR_NAME
 #endif
 
+/*
+** SQLITE_ENABLE_EXPLAIN_COMMENTS is incompatible with SQLITE_OMIT_EXPLAIN
+*/
+#ifdef SQLITE_OMIT_EXPLAIN
+# undef SQLITE_ENABLE_EXPLAIN_COMMENTS
+#endif
+
 /*
 ** Return true (non-zero) if the input is an integer that is too large
 ** to fit in 32-bits.  This macro is used inside of various testcase()
 ** macros to verify that we have tested SQLite for large-file support.
 */

Index: src/util.c
==================================================================
--- src/util.c
+++ src/util.c
@@ -1422,11 +1422,16 @@
   if( x<10 ) return 1;
   n = x%10;
   x /= 10;
   if( n>=5 ) n -= 2;
   else if( n>=1 ) n -= 1;
-  if( x>=3 ){
-    return x>60 ? (u64)LARGEST_INT64 : (n+8)<<(x-3);
-  }
-  return (n+8)>>(3-x);
+#if defined(SQLITE_ENABLE_STMT_SCANSTATUS) || \
+    defined(SQLITE_EXPLAIN_ESTIMATED_ROWS)
+  if( x>60 ) return (u64)LARGEST_INT64;
+#else
+  /* If only SQLITE_ENABLE_STAT3_OR_STAT4 is on, then the largest input
+  ** possible to this routine is 310, resulting in a maximum x of 31 */
+  assert( x<=60 );
+#endif
+  return x>=3 ? (n+8)<<(x-3) : (n+8)>>(3-x);
 }
 #endif /* defined SCANSTAT or STAT4 or ESTIMATED_ROWS */

Index: src/where.c
==================================================================
--- src/where.c
+++ src/where.c
@@ -1977,10 +1977,11 @@
 */
 static int whereLoopInsert(WhereLoopBuilder *pBuilder, WhereLoop *pTemplate){
   WhereLoop **ppPrev, *p;
   WhereInfo *pWInfo = pBuilder->pWInfo;
   sqlite3 *db = pWInfo->pParse->db;
+  int rc;
 
   /* If pBuilder->pOrSet is defined, then only keep track of the costs
   ** and prereqs.
   */
   if( pBuilder->pOrSet!=0 ){
@@ -2059,18 +2060,18 @@
       }
 #endif
       whereLoopDelete(db, pToDel);
     }
   }
-  whereLoopXfer(db, p, pTemplate);
+  rc = whereLoopXfer(db, p, pTemplate);
   if( (p->wsFlags & WHERE_VIRTUALTABLE)==0 ){
     Index *pIndex = p->u.btree.pIndex;
     if( pIndex && pIndex->tnum==0 ){
       p->u.btree.pIndex = 0;
     }
   }
-  return SQLITE_OK;
+  return rc;
 }
 
 /*
 ** Adjust the WhereLoop.nOut value downward to account for terms of the
 ** WHERE clause that reference the loop but which are not used by an
@@ -2884,20 +2885,20 @@
   if( pIdxInfo->idxFlags & SQLITE_INDEX_SCAN_UNIQUE ){
     pNew->wsFlags |= WHERE_ONEROW;
   }else{
     pNew->wsFlags &= ~WHERE_ONEROW;
   }
-  whereLoopInsert(pBuilder, pNew);
+  rc = whereLoopInsert(pBuilder, pNew);
   if( pNew->u.vtab.needFree ){
     sqlite3_free(pNew->u.vtab.idxStr);
     pNew->u.vtab.needFree = 0;
   }
   WHERETRACE(0xffff, ("  bIn=%d prereqIn=%04llx prereqOut=%04llx\n",
                       *pbIn, (sqlite3_uint64)mPrereq,
                       (sqlite3_uint64)(pNew->prereq & ~mPrereq)));
 
-  return SQLITE_OK;
+  return rc;
 }
 
 
 /*
 ** Add all WhereLoop objects for a table of the join identified by

Index: test/analyzer1.test
==================================================================
--- test/analyzer1.test
+++ test/analyzer1.test
@@ -23,13 +23,16 @@
   set PROG "sqlite3_analyzer.exe"
 } else {
   set PROG "./sqlite3_analyzer"
 }
 if {![file exe $PROG]} {
-  puts "analyzer1 cannot run because $PROG is not available"
-  finish_test
-  return
+  set PROG [file normalize [file join $::cmdlinearg(TESTFIXTURE_HOME) $PROG]]
+  if {![file exe $PROG]} {
+    puts "analyzer1 cannot run because $PROG is not available"
+    finish_test
+    return
+  }
 }
 db close
 forcedelete test.db test.db-journal test.db-wal
 sqlite3 db test.db
 

Index: test/autovacuum.test
==================================================================
--- test/autovacuum.test
+++ test/autovacuum.test
@@ -267,11 +267,11 @@
     SELECT rootpage FROM sqlite_master ORDER by rootpage
   }
 } {3 4 5 6 7 8 9 10}
 
 # Right now there are 5 free pages in the database. Consume and then free
-# a 520 pages. Then create 520 tables. This ensures that at least some of the
+# all 520 pages. Then create 520 tables. This ensures that at least some of the
 # desired root-pages reside on the second free-list trunk page, and that the
 # trunk itself is required at some point.
 do_test autovacuum-2.4.4 {
   execsql "
     INSERT INTO av3 VALUES ('[make_str abcde [expr 1020*520 + 500]]');
@@ -278,13 +278,24 @@
     DELETE FROM av3;
   "
 } {}
 set root_page_list [list]
 set pending_byte_page [expr ($::sqlite_pending_byte / 1024) + 1]
+
+# unusable_pages
+# These are either the pending_byte page or the pointer map pages
+#
+unset -nocomplain unusable_page
+if {[sqlite3 -has-codec]} {
+  array set unusable_page {205 1 408 1}
+} else {
+  array set unusable_page {207 1 412 1}
+}
+set unusable_page($pending_byte_page) 1
+
 for {set i 3} {$i<=532} {incr i} {
-  # 207 and 412 are pointer-map pages.
-  if { $i!=207 && $i!=412 && $i != $pending_byte_page} {
+  if {![info exists unusable_page($i)]} {
     lappend root_page_list $i
   }
 }
 if {$i >= $pending_byte_page} {
   lappend root_page_list $i

Index: test/backcompat.test
==================================================================
--- test/backcompat.test
+++ test/backcompat.test
@@ -83,11 +83,12 @@
 
   foreach bin $::BC(binaries) {
     set nErr [set_test_counter errors]
     foreach dir {0 1} {
 
-      set bintag [string map {testfixture {}} $bin]
+      set bintag $bin
+      regsub {.*testfixture\.} $bintag {} bintag
       set bintag [string map {\.exe {}} $bintag]
       if {$bintag == ""} {set bintag self}
       set ::bcname ".$bintag.$dir."
 
       rename do_test _do_test

Index: test/backup4.test
==================================================================
--- test/backup4.test
+++ test/backup4.test
@@ -20,10 +20,15 @@
 #
 
 set testdir [file dirname $argv0]
 source $testdir/tester.tcl
 set testprefix backup4
+
+# The codec logic does not work for zero-length database files.  A database
+# file must contain at least one page in order to be recognized as an
+# encrypted database.
+do_not_use_codec
 
 #-------------------------------------------------------------------------
 # At one point this test was failing because [db] was using an out of
 # date schema in test case 1.2.
 #

Index: test/bc_common.tcl
==================================================================
--- test/bc_common.tcl
+++ test/bc_common.tcl
@@ -5,11 +5,11 @@
   # Search for binaries to test against. Any executable files that match
   # our naming convention are assumed to be testfixture binaries to test
   # against.
   #
   set binaries [list]
-  set self [file tail [info nameofexec]]
+  set self [info nameofexec]
   set pattern "$self?*"
   if {$::tcl_platform(platform)=="windows"} {
     set pattern [string map {\.exe {}} $pattern]
   }
   foreach file [glob -nocomplain $pattern] {
@@ -50,11 +50,12 @@
   proc sql2 sql { code2 [list db eval $sql] }
 
   code1 { sqlite3 db test.db }
   code2 { sqlite3 db test.db }
 
-  set bintag [string map {testfixture {}} $bin]
+  set bintag $bin
+  regsub {.*testfixture\.} $bintag {} bintag
   set bintag [string map {\.exe {}} $bintag]
   if {$bintag == ""} {set bintag self}
   set saved_prefix $::testprefix
   append ::testprefix ".$bintag"
 

Index: test/bestindex1.test
==================================================================
--- test/bestindex1.test
+++ test/bestindex1.test
@@ -12,10 +12,15 @@
 #
 
 set testdir [file dirname $argv0]
 source $testdir/tester.tcl
 set testprefix bestindex1
+
+ifcapable !vtab {
+  finish_test
+  return
+}
 
 register_tcl_module db
 
 proc vtab_command {method args} {
   switch -- $method {
@@ -159,7 +164,5 @@
     SELECT rowid FROM t1 WHERE a IN ('one', 'four') ORDER BY +rowid
   } $plan($mode)
 }
 
 finish_test
-
-

Index: test/bestindex2.test
==================================================================
--- test/bestindex2.test
+++ test/bestindex2.test
@@ -11,10 +11,14 @@
 
 set testdir [file dirname $argv0]
 source $testdir/tester.tcl
 set testprefix bestindex2
 
+ifcapable !vtab {
+  finish_test
+  return
+}
 
 #-------------------------------------------------------------------------
 # Virtual table callback for table named $tbl, with the columns specified
 # by list argument $cols. e.g. if the function is invoked as:
 #
@@ -133,6 +137,5 @@
   0 2 2 {SCAN TABLE t2 VIRTUAL TABLE INDEX 0:indexed(c=?)} 
   0 3 3 {SCAN TABLE t3 VIRTUAL TABLE INDEX 0:indexed(e=?)}
 }
 
 finish_test
-

Index: test/close.test
==================================================================
--- test/close.test
+++ test/close.test
@@ -14,10 +14,14 @@
 
 
 set testdir [file dirname $argv0]
 source $testdir/tester.tcl
 set ::testprefix close
+
+# This module bypasses the "-key" logic in tester.tcl, so it cannot run
+# with the codec enabled.
+do_not_use_codec
 
 do_execsql_test 1.0 {
   CREATE TABLE t1(x);
   INSERT INTO t1 VALUES('one');
   INSERT INTO t1 VALUES('two');

Index: test/corrupt3.test
==================================================================
--- test/corrupt3.test
+++ test/corrupt3.test
@@ -16,14 +16,13 @@
 # $Id: corrupt3.test,v 1.2 2007/04/06 21:42:22 drh Exp $
 
 set testdir [file dirname $argv0]
 source $testdir/tester.tcl
 
-# Do not use a codec for tests in this file, as the database file is
-# manipulated directly using tcl scripts (using the [hexio_write] command).
-#
-do_not_use_codec
+# This module uses hard-coded offsets which do not work if the reserved_bytes
+# value is nonzero.
+if {[nonzero_reserved_bytes]} {finish_test; return;}
 
 # These tests deal with corrupt database files
 #
 database_may_be_corrupt
 

Index: test/corrupt4.test
==================================================================
--- test/corrupt4.test
+++ test/corrupt4.test
@@ -16,14 +16,13 @@
 # $Id: corrupt4.test,v 1.1 2007/09/07 14:32:07 drh Exp $
 
 set testdir [file dirname $argv0]
 source $testdir/tester.tcl
 
-# Do not use a codec for tests in this file, as the database file is
-# manipulated directly using tcl scripts (using the [hexio_write] command).
-#
-do_not_use_codec
+# This module uses hard-coded offsets which do not work if the reserved_bytes
+# value is nonzero.
+if {[nonzero_reserved_bytes]} {finish_test; return;}
 
 # These tests deal with corrupt database files
 #
 database_may_be_corrupt
 

Index: test/corrupt6.test
==================================================================
--- test/corrupt6.test
+++ test/corrupt6.test
@@ -17,14 +17,13 @@
 # $Id: corrupt6.test,v 1.2 2008/05/19 15:37:10 shane Exp $
 
 set testdir [file dirname $argv0]
 source $testdir/tester.tcl
 
-# Do not use a codec for tests in this file, as the database file is
-# manipulated directly using tcl scripts (using the [hexio_write] command).
-#
-do_not_use_codec
+# This module uses hard-coded offsets which do not work if the reserved_bytes
+# value is nonzero.
+if {[nonzero_reserved_bytes]} {finish_test; return;}
 
 # These tests deal with corrupt database files
 #
 database_may_be_corrupt
 

Index: test/corrupt7.test
==================================================================
--- test/corrupt7.test
+++ test/corrupt7.test
@@ -17,14 +17,13 @@
 # $Id: corrupt7.test,v 1.8 2009/08/10 10:18:08 danielk1977 Exp $
 
 set testdir [file dirname $argv0]
 source $testdir/tester.tcl
 
-# Do not use a codec for tests in this file, as the database file is
-# manipulated directly using tcl scripts (using the [hexio_write] command).
-#
-do_not_use_codec
+# This module uses hard-coded offsets which do not work if the reserved_bytes
+# value is nonzero.
+if {[nonzero_reserved_bytes]} {finish_test; return;}
 
 # These tests deal with corrupt database files
 #
 database_may_be_corrupt
 

Index: test/corruptE.test
==================================================================
--- test/corruptE.test
+++ test/corruptE.test
@@ -16,14 +16,13 @@
 #
 
 set testdir [file dirname $argv0]
 source $testdir/tester.tcl
 
-# Do not use a codec for tests in this file, as the database file is
-# manipulated directly using tcl scripts (using the [hexio_write] command).
-#
-do_not_use_codec
+# This module uses hard-coded offsets which do not work if the reserved_bytes
+# value is nonzero.
+if {[nonzero_reserved_bytes]} {finish_test; return;}
 
 # These tests deal with corrupt database files
 #
 database_may_be_corrupt
 

Index: test/corruptG.test
==================================================================
--- test/corruptG.test
+++ test/corruptG.test
@@ -12,14 +12,13 @@
 
 set testdir [file dirname $argv0]
 source $testdir/tester.tcl
 set testprefix corruptG
 
-# Do not use a codec for tests in this file, as the database file is
-# manipulated directly using tcl scripts (using the [hexio_write] command).
-#
-do_not_use_codec
+# This module uses hard-coded offsets which do not work if the reserved_bytes
+# value is nonzero.
+if {[nonzero_reserved_bytes]} {finish_test; return;}
 
 # These tests deal with corrupt database files
 #
 database_may_be_corrupt
 

Index: test/corruptH.test
==================================================================
--- test/corruptH.test
+++ test/corruptH.test
@@ -12,14 +12,14 @@
 
 set testdir [file dirname $argv0]
 source $testdir/tester.tcl
 set testprefix corruptH
 
-# Do not use a codec for tests in this file, as the database file is
-# manipulated directly using tcl scripts (using the [hexio_write] command).
-#
-do_not_use_codec
+# This module uses hard-coded offsets which do not work if the reserved_bytes
+# value is nonzero.
+if {[nonzero_reserved_bytes]} {finish_test; return;}
+
 database_may_be_corrupt
 
 # The corruption migrations tested by the code in this file are not detected
 # mmap mode.
 #

Index: test/corruptI.test
==================================================================
--- test/corruptI.test
+++ test/corruptI.test
@@ -17,14 +17,14 @@
 if {[permutation]=="mmap"} {
   finish_test
   return
 }
 
-# Do not use a codec for tests in this file, as the database file is
-# manipulated directly using tcl scripts (using the [hexio_write] command).
-#
-do_not_use_codec
+# This module uses hard-coded offsets which do not work if the reserved_bytes
+# value is nonzero.
+if {[nonzero_reserved_bytes]} {finish_test; return;}
+
 database_may_be_corrupt
 
 # Initialize the database.
 #
 do_execsql_test 1.1 {

Index: test/corruptJ.test
==================================================================
--- test/corruptJ.test
+++ test/corruptJ.test
@@ -20,14 +20,14 @@
 if {[permutation]=="mmap"} {
   finish_test
   return
 }
 
-# Do not use a codec for tests in this file, as the database file is
-# manipulated directly using tcl scripts (using the [hexio_write] command).
-#
-do_not_use_codec
+# This module uses hard-coded offsets which do not work if the reserved_bytes
+# value is nonzero.
+if {[nonzero_reserved_bytes]} {finish_test; return;}
+
 database_may_be_corrupt
 
 # Initialize the database.
 #
 do_execsql_test 1.1 {

Index: test/crash8.test
==================================================================
--- test/crash8.test
+++ test/crash8.test
@@ -23,10 +23,11 @@
 
 ifcapable !crashtest {
   finish_test
   return
 }
+do_not_use_codec
 
 do_test crash8-1.1 {
   execsql {
     PRAGMA auto_vacuum=OFF;
     CREATE TABLE t1(a, b);

Index: test/e_uri.test
==================================================================
--- test/e_uri.test
+++ test/e_uri.test
@@ -11,11 +11,11 @@
 #
 
 set testdir [file dirname $argv0]
 source $testdir/tester.tcl
 set testprefix e_uri
-
+do_not_use_codec
 db close
 
 proc parse_uri {uri} {
   testvfs tvfs2
   testvfs tvfs 

Index: test/e_vacuum.test
==================================================================
--- test/e_vacuum.test
+++ test/e_vacuum.test
@@ -157,39 +157,41 @@
   execsql { PRAGMA page_size = 2048 }
   execsql { PRAGMA auto_vacuum = NONE }
   execsql { PRAGMA page_size ; PRAGMA auto_vacuum }
 } {1024 1}
 
-# EVIDENCE-OF: R-08570-19916 However, when not in write-ahead log mode,
-# the page_size and/or auto_vacuum properties of an existing database
-# may be changed by using the page_size and/or pragma auto_vacuum
-# pragmas and then immediately VACUUMing the database.
-#
-do_test e_vacuum-1.3.2.1 {
-  execsql { PRAGMA journal_mode = delete }
-  execsql { PRAGMA page_size = 2048 }
-  execsql { PRAGMA auto_vacuum = NONE }
-  execsql VACUUM
-  execsql { PRAGMA page_size ; PRAGMA auto_vacuum }
-} {2048 0}
-
-# EVIDENCE-OF: R-48521-51450 When in write-ahead log mode, only the
-# auto_vacuum support property can be changed using VACUUM.
-#
-ifcapable wal {
-do_test e_vacuum-1.3.3.1 {
-  execsql { PRAGMA journal_mode = wal }
-  execsql { PRAGMA page_size ; PRAGMA auto_vacuum }
-} {2048 0}
-do_test e_vacuum-1.3.3.2 {
-  execsql { PRAGMA page_size = 1024 }
-  execsql { PRAGMA auto_vacuum = FULL }
-  execsql VACUUM
-  execsql { PRAGMA page_size ; PRAGMA auto_vacuum }
-} {2048 1}
-}
-
+if {![nonzero_reserved_bytes]} {
+  # EVIDENCE-OF: R-08570-19916 However, when not in write-ahead log mode,
+  # the page_size and/or auto_vacuum properties of an existing database
+  # may be changed by using the page_size and/or pragma auto_vacuum
+  # pragmas and then immediately VACUUMing the database.
+  #
+  do_test e_vacuum-1.3.2.1 {
+    execsql { PRAGMA journal_mode = delete }
+    execsql { PRAGMA page_size = 2048 }
+    execsql { PRAGMA auto_vacuum = NONE }
+    execsql VACUUM
+    execsql { PRAGMA page_size ; PRAGMA auto_vacuum }
+  } {2048 0}
+  
+  # EVIDENCE-OF: R-48521-51450 When in write-ahead log mode, only the
+  # auto_vacuum support property can be changed using VACUUM.
+  #
+  ifcapable wal {
+    do_test e_vacuum-1.3.3.1 {
+      execsql { PRAGMA journal_mode = wal }
+      execsql { PRAGMA page_size ; PRAGMA auto_vacuum }
+    } {2048 0}
+    do_test e_vacuum-1.3.3.2 {
+      execsql { PRAGMA page_size = 1024 }
+      execsql { PRAGMA auto_vacuum = FULL }
+      execsql VACUUM
+      execsql { PRAGMA page_size ; PRAGMA auto_vacuum }
+    } {2048 1}
+  }
+}
+  
 # EVIDENCE-OF: R-38001-03952 VACUUM only works on the main database. It
 # is not possible to VACUUM an attached database file.
 forcedelete test.db2
 create_db { PRAGMA auto_vacuum = NONE }
 do_execsql_test e_vacuum-2.1.1 {

Index: test/e_walauto.test
==================================================================
--- test/e_walauto.test
+++ test/e_walauto.test
@@ -21,10 +21,15 @@
 #
 if {$tcl_platform(os) == "OpenBSD"} {
   finish_test
   return
 }
+
+# This module uses hard-coded offsets which do not work if the reserved_bytes
+# value is nonzero.
+if {[nonzero_reserved_bytes]} {finish_test; return;}
+
 
 proc read_nbackfill {} {
   seek $::shmfd 96
   binary scan [read $::shmfd 4] n nBackfill
   set nBackfill

Index: test/eqp.test
==================================================================
--- test/eqp.test
+++ test/eqp.test
@@ -514,49 +514,51 @@
   2 0 0 {USE TEMP B-TREE FOR ORDER BY}
   0 0 0 {COMPOUND SUBQUERIES 1 AND 2 (EXCEPT)}
 }
 
 
-#-------------------------------------------------------------------------
-# The following tests - eqp-6.* - test that the example C code on 
-# documentation page eqp.html works. The C code is duplicated in test1.c
-# and wrapped in Tcl command [print_explain_query_plan] 
-#
-set boilerplate {
-  proc explain_query_plan {db sql} {
-    set stmt [sqlite3_prepare_v2 db $sql -1 DUMMY]
-    print_explain_query_plan $stmt
-    sqlite3_finalize $stmt
-  }
-  sqlite3 db test.db
-  explain_query_plan db {%SQL%}
-  db close
-  exit
-}
-
-# Do a "Print Explain Query Plan" test.
-proc do_peqp_test {tn sql res} {
-  set fd [open script.tcl w]
-  puts $fd [string map [list %SQL% $sql] $::boilerplate]
-  close $fd
-
-  uplevel do_test $tn [list {
-    set fd [open "|[info nameofexec] script.tcl"]
-    set data [read $fd]
-    close $fd
-    set data
-  }] [list $res]
-}
-
-do_peqp_test 6.1 {
-  SELECT a, b FROM t1 EXCEPT SELECT d, 99 FROM t2 ORDER BY 1
-} [string trimleft {
+if {![nonzero_reserved_bytes]} {
+  #-------------------------------------------------------------------------
+  # The following tests - eqp-6.* - test that the example C code on 
+  # documentation page eqp.html works. The C code is duplicated in test1.c
+  # and wrapped in Tcl command [print_explain_query_plan] 
+  #
+  set boilerplate {
+    proc explain_query_plan {db sql} {
+      set stmt [sqlite3_prepare_v2 db $sql -1 DUMMY]
+      print_explain_query_plan $stmt
+      sqlite3_finalize $stmt
+    }
+    sqlite3 db test.db
+    explain_query_plan db {%SQL%}
+    db close
+    exit
+  }
+  
+  # Do a "Print Explain Query Plan" test.
+  proc do_peqp_test {tn sql res} {
+    set fd [open script.tcl w]
+    puts $fd [string map [list %SQL% $sql] $::boilerplate]
+    close $fd
+  
+    uplevel do_test $tn [list {
+      set fd [open "|[info nameofexec] script.tcl"]
+      set data [read $fd]
+      close $fd
+      set data
+    }] [list $res]
+  }
+  
+  do_peqp_test 6.1 {
+    SELECT a, b FROM t1 EXCEPT SELECT d, 99 FROM t2 ORDER BY 1
+  } [string trimleft {
 1 0 0 SCAN TABLE t1 USING COVERING INDEX i2
 2 0 0 SCAN TABLE t2
 2 0 0 USE TEMP B-TREE FOR ORDER BY
 0 0 0 COMPOUND SUBQUERIES 1 AND 2 (EXCEPT)
 }]
+}
 
 #-------------------------------------------------------------------------
 # The following tests - eqp-7.* - test that queries that use the OP_Count
 # optimization return something sensible with EQP.
 #

Index: test/fts4opt.test
==================================================================
--- test/fts4opt.test
+++ test/fts4opt.test
@@ -163,7 +163,51 @@
 
 do_execsql_test 2.8 {
   INSERT INTO t2(words) SELECT words FROM t1;
   SELECT level, count(*) FROM t2_segdir GROUP BY level;
 } {0 2 1024 2 2048 2 3072 2}
+
+#-------------------------------------------------------------------------
+# Check that 'optimize' works when there is data in the in-memory hash
+# table, but no segments at all on disk.
+#
+do_execsql_test 3.1 {
+  CREATE VIRTUAL TABLE fts USING fts4 (t);
+  INSERT INTO fts (fts) VALUES ('optimize');
+}
+do_execsql_test 3.2 {
+  INSERT INTO fts(fts) VALUES('integrity-check');
+  SELECT count(*) FROM fts_segdir;
+} {0}
+do_execsql_test 3.3 {
+  BEGIN;
+  INSERT INTO fts (rowid, t) VALUES (2, 'test');
+  INSERT INTO fts (fts) VALUES ('optimize');
+  COMMIT;
+  SELECT level, idx FROM fts_segdir;
+} {0 0}
+do_execsql_test 3.4 {
+  INSERT INTO fts(fts) VALUES('integrity-check');
+  SELECT rowid FROM fts WHERE fts MATCH 'test';
+} {2}
+do_execsql_test 3.5 {
+  INSERT INTO fts (fts) VALUES ('optimize');
+  INSERT INTO fts(fts) VALUES('integrity-check');
+}
+do_test 3.6 {
+  set c1 [db total_changes]
+  execsql { INSERT INTO fts (fts) VALUES ('optimize') }
+  expr {[db total_changes] - $c1}
+} {1}
+do_test 3.7 {
+  execsql { INSERT INTO fts (rowid, t) VALUES (3, 'xyz') }
+  set c1 [db total_changes]
+  execsql { INSERT INTO fts (fts) VALUES ('optimize') }
+  expr {([db total_changes] - $c1) > 1}
+} {1}
+do_test 3.8 {
+  set c1 [db total_changes]
+  execsql { INSERT INTO fts (fts) VALUES ('optimize') }
+  expr {[db total_changes] - $c1}
+} {1}
 
 finish_test

Index: test/in5.test
==================================================================
--- test/in5.test
+++ test/in5.test
@@ -180,7 +180,42 @@
   CREATE TABLE x2(b);
   INSERT INTO x1 VALUES(1), (1), (2);
   INSERT INTO x2 VALUES(1), (2);
   SELECT count(*) FROM x2 WHERE b IN (SELECT DISTINCT a FROM x1 LIMIT 2);
 } {2}
+
+#-------------------------------------------------------------------------
+# Test to confirm that bug [5e3c886796e5] is fixed.
+#
+do_execsql_test 7.1 {
+  CREATE TABLE y1(a, b);
+  CREATE TABLE y2(c);
+
+  INSERT INTO y1 VALUES(1,     'one');
+  INSERT INTO y1 VALUES('two', 'two');
+  INSERT INTO y1 VALUES(3,     'three');
+
+  INSERT INTO y2 VALUES('one');
+  INSERT INTO y2 VALUES('two');
+  INSERT INTO y2 VALUES('three');
+} {}
+
+do_execsql_test 7.2.1 {
+  SELECT a FROM y1 WHERE b NOT IN (SELECT a FROM y2);
+} {1 3}
+do_execsql_test 7.2.2 {
+  SELECT a FROM y1 WHERE b IN (SELECT a FROM y2);
+} {two}
+
+do_execsql_test 7.3.1 {
+  CREATE INDEX y2c ON y2(c);
+  SELECT a FROM y1 WHERE b NOT IN (SELECT a FROM y2);
+} {1 3}
+do_execsql_test 7.3.2 {
+  SELECT a FROM y1 WHERE b IN (SELECT a FROM y2);
+} {two}
+
+finish_test
+
+
 
 finish_test

Index: test/incrblob.test
==================================================================
--- test/incrblob.test
+++ test/incrblob.test
@@ -124,10 +124,15 @@
 
   sqlite3 db test.db
   execsql "PRAGMA mmap_size = 0"
   execsql "PRAGMA auto_vacuum = $AutoVacuumMode"
 
+  # Extra value added to size answers
+  set ib2_extra 0
+  if {$AutoVacuumMode} {incr ib2_extra}
+  if {[nonzero_reserved_bytes]} {incr ib2_extra}
+
   do_test incrblob-2.$AutoVacuumMode.1 {
     set ::str [string repeat abcdefghij 2900]
     execsql {
       BEGIN;
       CREATE TABLE blobs(k PRIMARY KEY, v BLOB, i INTEGER);
@@ -134,11 +139,11 @@
       DELETE FROM blobs;
       INSERT INTO blobs VALUES('one', $::str || randstr(500,500), 45);
       COMMIT;
     }
     expr [file size test.db]/1024
-  } [expr 31 + $AutoVacuumMode]
+  } [expr 31 + $ib2_extra]
 
   ifcapable autovacuum {
     do_test incrblob-2.$AutoVacuumMode.2 {
       execsql {
         PRAGMA auto_vacuum;
@@ -161,11 +166,11 @@
     # If the database is not in auto-vacuum mode, the whole of
     # the overflow-chain must be scanned. In auto-vacuum mode,
     # sqlite uses the ptrmap pages to avoid reading the other pages.
     #
     nRead db
-  } [expr $AutoVacuumMode ? 4 : 30]
+  } [expr $AutoVacuumMode ? 4 : 30+$ib2_extra]
 
   do_test incrblob-2.$AutoVacuumMode.4 {
     string range [db one {SELECT v FROM blobs}] end-19 end
   } $::fragment
 
@@ -185,11 +190,11 @@
     # If the database is not in auto-vacuum mode, the whole of
     # the overflow-chain must be scanned. In auto-vacuum mode,
     # sqlite uses the ptrmap pages to avoid reading the other pages.
     #
     nRead db
-  } [expr $AutoVacuumMode ? 4 : 30]
+  } [expr $AutoVacuumMode ? 4 : 30 + $ib2_extra]
 
   # Pages 1 (the write-counter) and 32 (the blob data) were written.
   do_test incrblob-2.$AutoVacuumMode.6 {
     close $::blob
     nWrite db
@@ -208,11 +213,11 @@
     execsql { SELECT i FROM blobs } 
   } {45}
 
   do_test incrblob-2.$AutoVacuumMode.9 {
     nRead db
-  } [expr $AutoVacuumMode ? 4 : 30]
+  } [expr $AutoVacuumMode ? 4 : 30 + $ib2_extra]
 }
 sqlite3_soft_heap_limit $cmdlinearg(soft-heap-limit)
 
 #------------------------------------------------------------------------
 # incrblob-3.*: 
@@ -382,28 +387,28 @@
 #     Test that opening a blob in an attached database works.
 #
 ifcapable attach {
   do_test incrblob-5.1 {
     forcedelete test2.db test2.db-journal
-    set ::size [expr [file size [info script]]]
+    set ::size [expr [file size $::cmdlinearg(INFO_SCRIPT)]]
     execsql {
       ATTACH 'test2.db' AS aux;
       CREATE TABLE aux.files(name, text);
       INSERT INTO aux.files VALUES('this one', zeroblob($::size));
     }
     set fd  [db incrblob aux files text 1]
     fconfigure $fd -translation binary
-    set fd2 [open [info script]]
+    set fd2 [open $::cmdlinearg(INFO_SCRIPT)]
     fconfigure $fd2 -translation binary
     puts -nonewline $fd [read $fd2]
     close $fd
     close $fd2
     set ::text [db one {select text from aux.files}]
     string length $::text
-  } [file size [info script]]
+  } [file size $::cmdlinearg(INFO_SCRIPT)]
   do_test incrblob-5.2 {
-    set fd2 [open [info script]]
+    set fd2 [open $::cmdlinearg(INFO_SCRIPT)]
     fconfigure $fd2 -translation binary
     set ::data [read $fd2]
     close $fd2
     set ::data
   } $::text
@@ -574,11 +579,11 @@
     }
   } {15}
 
 }
 
-set fd [open [info script]]
+set fd [open $::cmdlinearg(INFO_SCRIPT)]
 fconfigure $fd -translation binary
 set ::data [read $fd 14000]
 close $fd
 
 db close

Index: test/incrblob_err.test
==================================================================
--- test/incrblob_err.test
+++ test/incrblob_err.test
@@ -22,16 +22,16 @@
 }
 
 source $testdir/malloc_common.tcl
 
 unset -nocomplain ::fd ::data
-set ::fd [open [info script]]
+set ::fd [open $::cmdlinearg(INFO_SCRIPT)]
 set ::data [read $::fd]
 close $::fd
 
 do_malloc_test 1 -tclprep {
-  set bytes [file size [info script]]
+  set bytes [file size $::cmdlinearg(INFO_SCRIPT)]
   execsql {
     CREATE TABLE blobs(k, v BLOB);
     INSERT INTO blobs VALUES(1, zeroblob($::bytes));
   }
 } -tclbody {

Index: test/io.test
==================================================================
--- test/io.test
+++ test/io.test
@@ -422,11 +422,11 @@
   } {1 0}
   do_test io-3.3 {
     # The COMMIT requires a single fsync() - to the database file.
     execsql { COMMIT }
     list [file size test.db] [nSync]
-  } {39936 1}
+  } "[expr {[nonzero_reserved_bytes]?40960:39936}] 1"
 }
 
 #----------------------------------------------------------------------
 # Test cases io-4.* test the IOCAP_SAFE_APPEND optimization.
 #

Index: test/memsubsys1.test
==================================================================
--- test/memsubsys1.test
+++ test/memsubsys1.test
@@ -253,11 +253,11 @@
 do_test memsubsys1-7.4 {
   set pg_ovfl [lindex [sqlite3_status SQLITE_STATUS_PAGECACHE_OVERFLOW 0] 2]
 } 0
 do_test memsubsys1-7.5 {
   set maxreq [lindex [sqlite3_status SQLITE_STATUS_MALLOC_SIZE 0] 2]
-  expr {$maxreq<4100}
+  expr {$maxreq<4100 + 4200*[nonzero_reserved_bytes]}
 } 1
 do_test memsubsys1-7.6 {
   set s_used [lindex [sqlite3_status SQLITE_STATUS_SCRATCH_USED 0] 2]
 } 1
 do_test memsubsys1-7.7 {

Index: test/mmap1.test
==================================================================
--- test/mmap1.test
+++ test/mmap1.test
@@ -86,11 +86,11 @@
 
     # Have connection 2 shrink the file. Check connection 1 can still read it.
     sql2 { DELETE FROM t1 WHERE rowid%2; }
     do_test $t.$tn.2 {
       sql1 "SELECT count(*) FROM t1; PRAGMA integrity_check ; PRAGMA page_count"
-    } {16 ok 42}
+    } "16 ok [expr {42+[nonzero_reserved_bytes]}]"
 
     # Have connection 2 grow the file. Check connection 1 can still read it.
     sql2 { INSERT INTO t1 SELECT rblob(500), rblob(500) FROM t1 }
     do_test $t.$tn.3 {
       sql1 "SELECT count(*) FROM t1; PRAGMA integrity_check ; PRAGMA page_count"
@@ -102,11 +102,13 @@
       sql1 "SELECT count(*) FROM t1; PRAGMA integrity_check ; PRAGMA page_count"
     } {64 ok 149}
 
     # Check that the number of pages read by connection 1 indicates that the
     # "PRAGMA mmap_size" command worked.
-    do_test $t.$tn.5 { nRead db } $nRead
+    if {[nonzero_reserved_bytes]==0} {
+      do_test $t.$tn.5 { nRead db } $nRead
+    }
   }
 }
 
 set ::rcnt 0
 proc rblob {n} {

Index: test/mmap3.test
==================================================================
--- test/mmap3.test
+++ test/mmap3.test
@@ -17,10 +17,13 @@
   return
 }
 source $testdir/lock_common.tcl
 set testprefix mmap3
 
+# A codec shuts down memory-mapped I/O
+if {[nonzero_reserved_bytes]} {finish_test; return;}
+
 do_test mmap3-1.0 {
   load_static_extension db wholenumber
   db eval {
     PRAGMA mmap_size=100000;
     CREATE TABLE t1(x, y);

Index: test/nan.test
==================================================================
--- test/nan.test
+++ test/nan.test
@@ -149,49 +149,51 @@
 # of tests writes a normal floating point value (0.5) into the database,
 # then writes directly into the database file to change the 0.5 into NaN.
 # Then it reads the value of the database to verify it is converted into
 # NULL.
 #
-do_test nan-3.1 {
-  db eval {
-    DELETE FROM t1;
-    INSERT INTO t1 VALUES(0.5);
-    PRAGMA auto_vacuum=OFF;
-    PRAGMA page_size=1024;
-    VACUUM;
-  }
-  hexio_read test.db 2040 8
-} {3FE0000000000000}
-do_test nan-3.2 {
-  db eval {
-    SELECT x, typeof(x) FROM t1
-  }
-} {0.5 real}
-do_test nan-3.3 {
-  db close
-  hexio_write test.db 2040 FFF8000000000000
-  sqlite3 db test.db
-  db eval {SELECT x, typeof(x) FROM t1}
-} {{} null}
-do_test nan-3.4 {
-  db close
-  hexio_write test.db 2040 7FF8000000000000
-  sqlite3 db test.db
-  db eval {SELECT x, typeof(x) FROM t1}
-} {{} null}
-do_test nan-3.5 {
-  db close
-  hexio_write test.db 2040 FFFFFFFFFFFFFFFF
-  sqlite3 db test.db
-  db eval {SELECT x, typeof(x) FROM t1}
-} {{} null}
-do_test nan-3.6 {
-  db close
-  hexio_write test.db 2040 7FFFFFFFFFFFFFFF
-  sqlite3 db test.db
-  db eval {SELECT x, typeof(x) FROM t1}
-} {{} null}
+if {![nonzero_reserved_bytes]} {
+  do_test nan-3.1 {
+    db eval {
+      DELETE FROM t1;
+      INSERT INTO t1 VALUES(0.5);
+      PRAGMA auto_vacuum=OFF;
+      PRAGMA page_size=1024;
+      VACUUM;
+    }
+    hexio_read test.db 2040 8
+  } {3FE0000000000000}
+  do_test nan-3.2 {
+    db eval {
+      SELECT x, typeof(x) FROM t1
+    }
+  } {0.5 real}
+  do_test nan-3.3 {
+    db close
+    hexio_write test.db 2040 FFF8000000000000
+    sqlite3 db test.db
+    db eval {SELECT x, typeof(x) FROM t1}
+  } {{} null}
+  do_test nan-3.4 {
+    db close
+    hexio_write test.db 2040 7FF8000000000000
+    sqlite3 db test.db
+    db eval {SELECT x, typeof(x) FROM t1}
+  } {{} null}
+  do_test nan-3.5 {
+    db close
+    hexio_write test.db 2040 FFFFFFFFFFFFFFFF
+    sqlite3 db test.db
+    db eval {SELECT x, typeof(x) FROM t1}
+  } {{} null}
+  do_test nan-3.6 {
+    db close
+    hexio_write test.db 2040 7FFFFFFFFFFFFFFF
+    sqlite3 db test.db
+    db eval {SELECT x, typeof(x) FROM t1}
+  } {{} null}
+}
 
 # Verify that the sqlite3AtoF routine is able to handle extreme
 # numbers.
 #
 do_test nan-4.1 {

Index: test/nolock.test
==================================================================
--- test/nolock.test
+++ test/nolock.test
@@ -180,6 +180,38 @@
 } {xLock 0 xUnlock 0 xCheckReservedLock 0 xAccess 0}
 
 db2 close
 db close
 tvfs delete
+
+# 2016-03-11:  Make sure all works when transitioning to WAL mode under nolock.
+#
+do_test nolock-4.1 {
+  forcedelete test.db
+  sqlite3 db file:test.db?nolock=1 -uri 1
+  db eval {
+     PRAGMA journal_mode=WAL;
+     CREATE TABLE t1(x);
+     INSERT INTO t1 VALUES('youngling');
+     SELECT * FROM t1;
+  }
+} {delete youngling}
+db close
+
+do_test nolock-4.2 {
+  forcedelete test.db
+  sqlite3 db test.db
+  db eval {
+    PRAGMA journal_mode=WAL;
+    CREATE TABLE t1(x);
+    INSERT INTO t1 VALUES('catbird');
+    SELECT * FROM t1;
+  }
+} {wal catbird}
+do_test nolock-4.3 {
+  db close
+  sqlite3 db file:test.db?nolock=1 -uri 1
+  set rc [catch {db eval {SELECT * FROM t1}} msg]
+  lappend rc $msg
+} {1 {unable to open database file}}
+
 finish_test

Index: test/pager1.test
==================================================================
--- test/pager1.test
+++ test/pager1.test
@@ -1394,30 +1394,51 @@
   faultsim_delete_and_reopen
 
   execsql { PRAGMA page_size = 1024 }
   for {set ii 0} {$ii < 4} {incr ii} { execsql "CREATE TABLE t${ii}(a, b)" }
 } {}
-do_test pager1-9.3.2 {
-  sqlite3 db2 test.db2
-
-  execsql {
-    PRAGMA page_size = 4096;
-    PRAGMA synchronous = OFF;
-    CREATE TABLE t1(a, b);
-    CREATE TABLE t2(a, b);
-  } db2
-
-  sqlite3_backup B db2 main db main
-  B step 30
-  list [B step 10000] [B finish]
-} {SQLITE_DONE SQLITE_OK}
-do_test pager1-9.3.3 {
-  db2 close
-  db close
-  tv delete
-  file size test.db2
-} [file size test.db]
+if {[nonzero_reserved_bytes]} {
+  # backup with a page size changes is not possible with the codec
+  #
+  do_test pager1-9.3.2codec {
+    sqlite3 db2 test.db2
+    execsql {
+      PRAGMA page_size = 4096;
+      PRAGMA synchronous = OFF;
+      CREATE TABLE t1(a, b);
+      CREATE TABLE t2(a, b);
+    } db2
+    sqlite3_backup B db2 main db main
+    B step 30
+    list [B step 10000] [B finish]
+  } {SQLITE_READONLY SQLITE_READONLY}
+  do_test pager1-9.3.3codec {
+    db2 close
+    db close
+    tv delete
+    file size test.db2
+  } [file size test.db2]
+} else {
+  do_test pager1-9.3.2 {
+    sqlite3 db2 test.db2
+    execsql {
+      PRAGMA page_size = 4096;
+      PRAGMA synchronous = OFF;
+      CREATE TABLE t1(a, b);
+      CREATE TABLE t2(a, b);
+    } db2
+    sqlite3_backup B db2 main db main
+    B step 30
+    list [B step 10000] [B finish]
+  } {SQLITE_DONE SQLITE_OK}
+  do_test pager1-9.3.3 {
+    db2 close
+    db close
+    tv delete
+    file size test.db2
+  } [file size test.db]
+}
 
 do_test pager1-9.4.1 {
   faultsim_delete_and_reopen
   sqlite3 db2 test.db2
   execsql {
@@ -2445,17 +2466,27 @@
     CREATE TABLE t1(a, b);
     INSERT INTO t1 VALUES(1, 2);
   }
   file size test.db
 } [expr 1024*3]
-do_test pager1-29.2 {
-  execsql {
-    PRAGMA page_size = 4096;
-    VACUUM;
-  }
-  file size test.db
-} [expr 4096*3]
+if {[nonzero_reserved_bytes]} {
+  # VACUUM with size changes is not possible with the codec.
+  do_test pager1-29.2 {
+    catchsql {
+      PRAGMA page_size = 4096;
+      VACUUM;
+    }
+  } {1 {attempt to write a readonly database}}
+} else {
+  do_test pager1-29.2 {
+    execsql {
+      PRAGMA page_size = 4096;
+      VACUUM;
+    }
+    file size test.db
+  } [expr 4096*3]
+}
 
 #-------------------------------------------------------------------------
 # Test that if an empty database file (size 0 bytes) is opened in 
 # exclusive-locking mode, any journal file is deleted from the file-system
 # without being rolled back. And that the RESERVED lock obtained while

Index: test/pageropt.test
==================================================================
--- test/pageropt.test
+++ test/pageropt.test
@@ -14,10 +14,11 @@
 #
 # $Id: pageropt.test,v 1.5 2008/08/20 14:49:25 danielk1977 Exp $
 
 set testdir [file dirname $argv0]
 source $testdir/tester.tcl
+do_not_use_codec
 
 ifcapable {!pager_pragmas||secure_delete||direct_read} {
   finish_test
   return
 }

Index: test/permutations.test
==================================================================
--- test/permutations.test
+++ test/permutations.test
@@ -1066,16 +1066,16 @@
     }
   }
   exit -1
 }
 
-if {[info script] == $argv0} {
+if {[file tail $argv0] == "permutations.test"} {
   proc main {argv} {
     if {[llength $argv]==0} {
       help
     } else {
-      set suite [lindex $argv 0]
+      set suite [file tail [lindex $argv 0]]
       if {[info exists ::testspec($suite)]==0} help
       set extra ""
       if {[llength $argv]>1} { set extra [list -files [lrange $argv 1 end]] }
       eval run_tests $suite $::testspec($suite) $extra
     }

Index: test/pragma.test
==================================================================
--- test/pragma.test
+++ test/pragma.test
@@ -1739,77 +1739,79 @@
 
 forcedelete data_dir
 } ;# endif windows
 
 database_may_be_corrupt
-
-do_test 21.1 {
-  # Create a corrupt database in testerr.db. And a non-corrupt at test.db.
-  #
-  db close
-  forcedelete test.db
-  sqlite3 db test.db
-  execsql { 
-    PRAGMA page_size = 1024;
-    PRAGMA auto_vacuum = 0;
-    CREATE TABLE t1(a PRIMARY KEY, b);
-    INSERT INTO t1 VALUES(1, 1);
-  }
-  for {set i 0} {$i < 10} {incr i} {
-    execsql { INSERT INTO t1 SELECT a + (1 << $i), b + (1 << $i) FROM t1 }
-  }
-  db close
-  forcecopy test.db testerr.db
-  hexio_write testerr.db 15000 [string repeat 55 100]
-} {100}
-
-set mainerr {*** in database main ***
-Multiple uses for byte 672 of page 15}
-set auxerr {*** in database aux ***
-Multiple uses for byte 672 of page 15}
-
-set mainerr {/{\*\*\* in database main \*\*\*
-Multiple uses for byte 672 of page 15}.*/}
-set auxerr {/{\*\*\* in database aux \*\*\*
-Multiple uses for byte 672 of page 15}.*/}
-
-do_test 22.2 {
-  catch { db close }
-  sqlite3 db testerr.db
-  execsql { PRAGMA integrity_check }
-} $mainerr
-
-do_test 22.3.1 {
-  catch { db close }
-  sqlite3 db test.db
-  execsql { 
-    ATTACH 'testerr.db' AS 'aux';
-    PRAGMA integrity_check;
-  }
-} $auxerr
-do_test 22.3.2 {
-  execsql { PRAGMA main.integrity_check; }
-} {ok}
-do_test 22.3.3 {
-  execsql { PRAGMA aux.integrity_check; }
-} $auxerr
-
-do_test 22.4.1 {
-  catch { db close }
-  sqlite3 db testerr.db
-  execsql { 
-    ATTACH 'test.db' AS 'aux';
-    PRAGMA integrity_check;
-  }
-} $mainerr
-do_test 22.4.2 {
-  execsql { PRAGMA main.integrity_check; }
-} $mainerr
-do_test 22.4.3 {
-  execsql { PRAGMA aux.integrity_check; }
-} {ok}
-
+if {![nonzero_reserved_bytes]} {
+
+  do_test 21.1 {
+    # Create a corrupt database in testerr.db. And a non-corrupt at test.db.
+    #
+    db close
+    forcedelete test.db
+    sqlite3 db test.db
+    execsql { 
+      PRAGMA page_size = 1024;
+      PRAGMA auto_vacuum = 0;
+      CREATE TABLE t1(a PRIMARY KEY, b);
+      INSERT INTO t1 VALUES(1, 1);
+    }
+    for {set i 0} {$i < 10} {incr i} {
+      execsql { INSERT INTO t1 SELECT a + (1 << $i), b + (1 << $i) FROM t1 }
+    }
+    db close
+    forcecopy test.db testerr.db
+    hexio_write testerr.db 15000 [string repeat 55 100]
+  } {100}
+  
+  set mainerr {*** in database main ***
+Multiple uses for byte 672 of page 15}
+  set auxerr {*** in database aux ***
+Multiple uses for byte 672 of page 15}
+  
+  set mainerr {/{\*\*\* in database main \*\*\*
+Multiple uses for byte 672 of page 15}.*/}
+  set auxerr {/{\*\*\* in database aux \*\*\*
+Multiple uses for byte 672 of page 15}.*/}
+  
+  do_test 22.2 {
+    catch { db close }
+    sqlite3 db testerr.db
+    execsql { PRAGMA integrity_check }
+  } $mainerr
+  
+  do_test 22.3.1 {
+    catch { db close }
+    sqlite3 db test.db
+    execsql { 
+      ATTACH 'testerr.db' AS 'aux';
+      PRAGMA integrity_check;
+    }
+  } $auxerr
+  do_test 22.3.2 {
+    execsql { PRAGMA main.integrity_check; }
+  } {ok}
+  do_test 22.3.3 {
+    execsql { PRAGMA aux.integrity_check; }
+  } $auxerr
+  
+  do_test 22.4.1 {
+    catch { db close }
+    sqlite3 db testerr.db
+    execsql { 
+      ATTACH 'test.db' AS 'aux';
+      PRAGMA integrity_check;
+    }
+  } $mainerr
+  do_test 22.4.2 {
+    execsql { PRAGMA main.integrity_check; }
+  } $mainerr
+  do_test 22.4.3 {
+    execsql { PRAGMA aux.integrity_check; }
+  } {ok}
+}
+  
 db close
 forcedelete test.db test.db-wal test.db-journal
 sqlite3 db test.db
 sqlite3 db2 test.db
 do_test 23.1 {

Index: test/pragma3.test
==================================================================
--- test/pragma3.test
+++ test/pragma3.test
@@ -13,10 +13,11 @@
 # This file implements tests for PRAGMA data_version command.
 #
 
 set testdir [file dirname $argv0]
 source $testdir/tester.tcl
+do_not_use_codec
 
 do_execsql_test pragma3-100 {
   PRAGMA data_version;
 } {1}
 do_execsql_test pragma3-101 {

Index: test/spellfix3.test
==================================================================
--- test/spellfix3.test
+++ test/spellfix3.test
@@ -33,11 +33,20 @@
 do_execsql_test 140 {
   SELECT spellfix1_scriptcode('فِي ذَلِكَ الوَقتِ، قالَ اللهُ: لِيَكُنْ نُورٌ. فَصَارَ نُورٌ.');
 } {160}
 do_execsql_test 200 {
   SELECT spellfix1_scriptcode('+3.14159');
-} {999}
+} {215}
 do_execsql_test 210 {
   SELECT spellfix1_scriptcode('And God said: "Да будет свет"');
 } {998}
+do_execsql_test 220 {
+  SELECT spellfix1_scriptcode('+3.14159 light');
+} {215}
+do_execsql_test 230 {
+  SELECT spellfix1_scriptcode('+3.14159 свет');
+} {220}
+do_execsql_test 240 {
+  SELECT spellfix1_scriptcode('וַיֹּ֥אמֶר +3.14159');
+} {125}
 
 finish_test

Index: test/stat.test
==================================================================
--- test/stat.test
+++ test/stat.test
@@ -19,10 +19,14 @@
 ifcapable !vtab||!compound {
   finish_test
   return
 }
 
+# This module uses hard-coded results that depend on exact measurements of
+# pages sizes at the byte level, and hence will not work if the reserved_bytes
+# value is nonzero.
+if {[nonzero_reserved_bytes]} {finish_test; return;}
 
 set ::asc 1
 proc a_string {n} { string range [string repeat [incr ::asc]. $n] 1 $n }
 db func a_string a_string
 

Index: test/superlock.test
==================================================================
--- test/superlock.test
+++ test/superlock.test
@@ -13,10 +13,11 @@
 set testdir [file dirname $argv0]
 source $testdir/tester.tcl
 source $testdir/lock_common.tcl
 
 set testprefix superlock
+do_not_use_codec
 
 # Test organization:
 #
 #   1.*: Test superlock on a rollback database. Test that once the db is
 #        superlocked, it is not possible for a second client to read from
@@ -236,17 +237,27 @@
 
 db_swap test.db2 test.db
 do_catchsql_test 6.9 { SELECT * FROM t1 } {0 {1 2 3 4}}
 do_catchsql_test 6.10 { SELECT * FROM t2 } {1 {no such table: t2}}
 
-do_execsql_test  6.11 { 
-  PRAGMA journal_mode = delete;
-  PRAGMA page_size = 512;
-  VACUUM;
-  PRAGMA journal_mode = wal;
-  INSERT INTO t1 VALUES(5, 6);
-} {delete wal}
+if {[nonzero_reserved_bytes]} {
+  # Vacuum with a size change is not allowed with the codec
+  do_execsql_test  6.11codec { 
+    PRAGMA journal_mode = delete;
+    VACUUM;
+    PRAGMA journal_mode = wal;
+    INSERT INTO t1 VALUES(5, 6);
+  } {delete wal}
+} else {
+  do_execsql_test  6.11 { 
+    PRAGMA journal_mode = delete;
+    PRAGMA page_size = 512;
+    VACUUM;
+    PRAGMA journal_mode = wal;
+    INSERT INTO t1 VALUES(5, 6);
+  } {delete wal}
+}
 
 db_swap test.db2 test.db
 do_catchsql_test 6.12 { SELECT * FROM t1 } {1 {no such table: t1}}
 do_catchsql_test 6.13 { SELECT * FROM t2 } {0 {a b}}
 

Index: test/tclsqlite.test
==================================================================
--- test/tclsqlite.test
+++ test/tclsqlite.test
@@ -20,14 +20,13 @@
 set testdir [file dirname $argv0]
 source $testdir/tester.tcl
 
 # Check the error messages generated by tclsqlite
 #
+set r "sqlite_orig HANDLE FILENAME ?-vfs VFSNAME? ?-readonly BOOLEAN? ?-create BOOLEAN? ?-nomutex BOOLEAN? ?-fullmutex BOOLEAN? ?-uri BOOLEAN?"
 if {[sqlite3 -has-codec]} {
-  set r "sqlite_orig HANDLE FILENAME ?-key CODEC-KEY?"
-} else {
-  set r "sqlite_orig HANDLE FILENAME ?-vfs VFSNAME? ?-readonly BOOLEAN? ?-create BOOLEAN? ?-nomutex BOOLEAN? ?-fullmutex BOOLEAN? ?-uri BOOLEAN?"
+  append r " ?-key CODECKEY?"
 }
 do_test tcl-1.1 {
   set v [catch {sqlite3 bogus} msg]
   regsub {really_sqlite3} $msg {sqlite3} msg
   lappend v $msg

Index: test/tester.tcl
==================================================================
--- test/tester.tcl
+++ test/tester.tcl
@@ -371,10 +371,16 @@
 #
 proc do_not_use_codec {} {
   set ::do_not_use_codec 1
   reset_db
 }
+
+# Return true if the "reserved_bytes" integer on database files is non-zero.
+#
+proc nonzero_reserved_bytes {} {
+  return [sqlite3 -has-codec]
+}
 
 # Print a HELP message and exit
 #
 proc print_help_and_quit {} {
   puts {Options:
@@ -409,10 +415,12 @@
   #   --file-retry-delay=N
   #   --start=[$permutation:]$testfile
   #   --match=$pattern
   #   --verbose=$val
   #   --output=$filename
+  #   -q                                      Reduce output
+  #   --testdir=$dir                          Run tests in subdirectory $dir
   #   --help
   #
   set cmdlinearg(soft-heap-limit)    0
   set cmdlinearg(maxerror)        1000
   set cmdlinearg(malloctrace)        0
@@ -423,10 +431,11 @@
   set cmdlinearg(file-retry-delay)   0
   set cmdlinearg(start)             ""
   set cmdlinearg(match)             ""
   set cmdlinearg(verbose)           ""
   set cmdlinearg(output)            ""
+  set cmdlinearg(testdir)           "testdir"
 
   set leftover [list]
   foreach a $argv {
     switch -regexp -- $a {
       {^-+pause$} {
@@ -452,10 +461,11 @@
         foreach {dummy cmdlinearg(backtrace)} [split $a =] break
         sqlite3_memdebug_backtrace $value
       }
       {^-+binarylog=.+$} {
         foreach {dummy cmdlinearg(binarylog)} [split $a =] break
+        set cmdlinearg(binarylog) [file normalize $cmdlinearg(binarylog)]
       }
       {^-+soak=.+$} {
         foreach {dummy cmdlinearg(soak)} [split $a =] break
         set ::G(issoak) $cmdlinearg(soak)
       }
@@ -484,10 +494,11 @@
         if {$::G(match) == ""} {unset ::G(match)}
       }
 
       {^-+output=.+$} {
         foreach {dummy cmdlinearg(output)} [split $a =] break
+        set cmdlinearg(output) [file normalize $cmdlinearg(output)]
         if {$cmdlinearg(verbose)==""} {
           set cmdlinearg(verbose) 2
         }
       }
       {^-+verbose=.+$} {
@@ -496,22 +507,33 @@
           set cmdlinearg(verbose) 2
         } elseif {[string is boolean -strict $cmdlinearg(verbose)]==0} {
           error "option --verbose= must be set to a boolean or to \"file\""
         }
       }
+      {^-+testdir=.*$} {
+        foreach {dummy cmdlinearg(testdir)} [split $a =] break
+      }
       {.*help.*} {
          print_help_and_quit
       }
       {^-q$} {
         set cmdlinearg(output) test-out.txt
         set cmdlinearg(verbose) 2
       }
 
       default {
-        lappend leftover $a
+        lappend leftover [file normalize $a]
       }
     }
+  }
+  set testdir [file normalize $testdir]
+  set cmdlinearg(TESTFIXTURE_HOME) [pwd]
+  set cmdlinearg(INFO_SCRIPT) [file normalize [info script]]
+  set argv0 [file normalize $argv0]
+  if {$cmdlinearg(testdir)!=""} {
+    file mkdir $cmdlinearg(testdir)
+    cd $cmdlinearg(testdir)
   }
   set argv $leftover
 
   # Install the malloc layer used to inject OOM errors. And the 'automatic'
   # extensions. This only needs to be done once for the process.

Index: test/tkt4018.test
==================================================================
--- test/tkt4018.test
+++ test/tkt4018.test
@@ -14,10 +14,11 @@
 # fixed.  
 #
 
 set testdir [file dirname $argv0]
 source $testdir/tester.tcl
+do_not_use_codec
 
 proc testsql {sql} {
   set fd [open tf_main.tcl w]
   puts $fd [subst -nocommands {
     sqlite3_test_control_pending_byte 0x0010000

Index: test/wal.test
==================================================================
--- test/wal.test
+++ test/wal.test
@@ -1376,10 +1376,11 @@
 } {ok}
 
 #-------------------------------------------------------------------------
 # Test reading and writing of databases with different page-sizes.
 #
+incr ::do_not_use_codec
 foreach pgsz {512 1024 2048 4096 8192 16384 32768 65536} {
   do_multiclient_test tn [string map [list %PGSZ% $pgsz] {
     do_test wal-22.%PGSZ%.$tn.1 {
       sql1 {
         PRAGMA main.page_size = %PGSZ%;
@@ -1396,10 +1397,11 @@
       sql1 {PRAGMA wal_checkpoint}
       expr {[file size test.db] % %PGSZ%}
     } {0}
   }]
 }
+incr ::do_not_use_codec -1
 
 #-------------------------------------------------------------------------
 # Test that when 1 or more pages are recovered from a WAL file, 
 # sqlite3_log() is invoked to report this to the user.
 #

Index: test/wal5.test
==================================================================
--- test/wal5.test
+++ test/wal5.test
@@ -16,10 +16,11 @@
 set testdir [file dirname $argv0]
 source $testdir/tester.tcl
 source $testdir/lock_common.tcl
 source $testdir/wal_common.tcl
 ifcapable !wal {finish_test ; return }
+do_not_use_codec
 
 set testprefix wal5
 
 proc db_page_count  {{file test.db}} { expr [file size $file] / 1024 }
 proc wal_page_count {{file test.db}} { wal_frame_count ${file}-wal 1024 }

Index: test/wal8.test
==================================================================
--- test/wal8.test
+++ test/wal8.test
@@ -25,10 +25,11 @@
 #
 set testdir [file dirname $argv0]
 source $testdir/tester.tcl
 set ::testprefix wal8
 ifcapable !wal {finish_test ; return }
+do_not_use_codec
 
 db close
 forcedelete test.db test.db-wal
 
 sqlite3 db test.db

Index: test/walbak.test
==================================================================
--- test/walbak.test
+++ test/walbak.test
@@ -125,10 +125,11 @@
       INSERT INTO t1 SELECT randomblob(500), randomblob(500) FROM t1; /* 64 */
     COMMIT;
   }
 } {}
 do_test walbak-2.2 {
+  forcedelete abc.db
   db backup abc.db
   sqlite3 db2 abc.db
   string compare [sig db] [sig db2]
 } {0}
 
@@ -237,10 +238,11 @@
       CREATE TABLE xx(x);
     }
   }
 
 } {
+  if {$tn==4 && [sqlite3 -has-codec]} continue
   foreach f [glob -nocomplain test.db*] { forcedelete $f }
 
   eval $setup
 
   do_test walbak-3.$tn.1 {

Index: test/walro.test
==================================================================
--- test/walro.test
+++ test/walro.test
@@ -210,11 +210,11 @@
       INSERT INTO t2 SELECT x||y, y||x FROM t2;
       INSERT INTO t2 SELECT x||y, y||x FROM t2;
       INSERT INTO t2 SELECT x||y, y||x FROM t2;
     }
     file size test.db-wal
-  } {147800}
+  } [expr {[nonzero_reserved_bytes]?148848:147800}]
   do_test 1.4.4.2 {
     csql1 { SELECT * FROM t1 }
   } {0 {a b c d e f g h i j k l 1 2 3 4 5 6}}
   do_test 1.4.4.3 {
     csql2 COMMIT

Index: test/where2.test
==================================================================
--- test/where2.test
+++ test/where2.test
@@ -762,7 +762,18 @@
   CREATE TABLE t13(a,b);
   CREATE INDEX t13a ON t13(a);
   INSERT INTO t13 VALUES(4,5);
   SELECT * FROM t13 WHERE (1=2 AND a=3) OR a=4;
 } {4 5}
+
+# https://www.sqlite.org/src/info/5e3c886796e5512e  (2016-03-09)
+# Correlated subquery on the RHS of an IN operator 
+#
+do_execsql_test where2-14.1 {
+  CREATE TABLE t14a(x INTEGER PRIMARY KEY);
+  INSERT INTO t14a(x) VALUES(1),(2),(3),(4);
+  CREATE TABLE t14b(y INTEGER PRIMARY KEY);
+  INSERT INTO t14b(y) VALUES(1);
+  SELECT x FROM t14a WHERE x NOT IN (SELECT x FROM t14b);
+} {}
 
 finish_test

Index: tool/build-all-msvc.bat
==================================================================
--- tool/build-all-msvc.bat
+++ tool/build-all-msvc.bat
@@ -663,15 +663,17 @@
         REM NOTE: Copy the "sqlite3.pdb" file to the appropriate directory for
         REM       the build and platform beneath the binary directory unless we
         REM       are prevented from doing so.
         REM
         IF NOT DEFINED NOSYMBOLS (
-          %__ECHO% XCOPY "%DLL_PDB_FILE_NAME%" "%BINARYDIRECTORY%\%%B\%%D\" %FFLAGS% %DFLAGS%
+          IF EXIST "%DLL_PDB_FILE_NAME%" (
+            %__ECHO% XCOPY "%DLL_PDB_FILE_NAME%" "%BINARYDIRECTORY%\%%B\%%D\" %FFLAGS% %DFLAGS%
 
-          IF ERRORLEVEL 1 (
-            ECHO Failed to copy "%DLL_PDB_FILE_NAME%" to "%BINARYDIRECTORY%\%%B\%%D\".
-            GOTO errors
+            IF ERRORLEVEL 1 (
+              ECHO Failed to copy "%DLL_PDB_FILE_NAME%" to "%BINARYDIRECTORY%\%%B\%%D\".
+              GOTO errors
+            )
           )
         )
 
         REM
         REM NOTE: If requested, also build the shell executable.
@@ -720,15 +722,17 @@
           REM NOTE: Copy the "sqlite3sh.pdb" file to the appropriate directory
           REM       for the build and platform beneath the binary directory
           REM       unless we are prevented from doing so.
           REM
           IF NOT DEFINED NOSYMBOLS (
-            %__ECHO% XCOPY "%EXE_PDB_FILE_NAME%" "%BINARYDIRECTORY%\%%B\%%D\" %FFLAGS% %DFLAGS%
+            IF EXIST "%EXE_PDB_FILE_NAME%" (
+              %__ECHO% XCOPY "%EXE_PDB_FILE_NAME%" "%BINARYDIRECTORY%\%%B\%%D\" %FFLAGS% %DFLAGS%
 
-            IF ERRORLEVEL 1 (
-              ECHO Failed to copy "%EXE_PDB_FILE_NAME%" to "%BINARYDIRECTORY%\%%B\%%D\".
-              GOTO errors
+              IF ERRORLEVEL 1 (
+                ECHO Failed to copy "%EXE_PDB_FILE_NAME%" to "%BINARYDIRECTORY%\%%B\%%D\".
+                GOTO errors
+              )
             )
           )
         )
       )
     )