Index: src/where.c
==================================================================
--- src/where.c
+++ src/where.c
@@ -641,13 +641,12 @@
 **
 ** If there are multiple terms in the WHERE clause of the form "X <op> <expr>"
 ** then try for the one with no dependencies on <expr> - in other words where
 ** <expr> is a constant expression of some kind.  Only return entries of
 ** the form "X <op> Y" where Y is a column in another table if no terms of
-** the form "X <op> <const-expr>" exist.  Other than this priority, if there
-** are two or more terms that match, then the choice of which term to return
-** is arbitrary.
+** the form "X <op> <const-expr>" exist.   If no terms with a constant RHS
+** exist, try to return a term that does not use WO_EQUIV.
 */
 static WhereTerm *findTerm(
   WhereClause *pWC,     /* The WHERE clause to be searched */
   int iCur,             /* Cursor number of LHS */
   int iColumn,          /* Column number of LHS */
@@ -702,12 +701,16 @@
               }
               if( sqlite3StrICmp(pColl->zName, pIdx->azColl[j]) ){
                 continue;
               }
             }
-            pResult = pTerm;
-            if( pTerm->prereqRight==0 ) goto findTerm_success;
+            if( pTerm->prereqRight==0 ){
+              pResult = pTerm;
+              goto findTerm_success;
+            }else if( pResult==0 ){
+              pResult = pTerm;
+            }
           }
           if( (pTerm->eOperator & WO_EQUIV)!=0
            && nEquiv<ArraySize(aEquiv)
           ){
             pX = sqlite3ExprSkipCollate(pTerm->pExpr->pRight);
@@ -4229,10 +4232,11 @@
     testcase( pTerm->wtFlags & TERM_VIRTUAL ); /* EV: R-30575-11662 */
     iRowidReg = codeEqualityTerm(pParse, pTerm, pLevel, iReleaseReg);
     addrNxt = pLevel->addrNxt;
     sqlite3VdbeAddOp2(v, OP_MustBeInt, iRowidReg, addrNxt);
     sqlite3VdbeAddOp3(v, OP_NotExists, iCur, addrNxt, iRowidReg);
+    sqlite3ExprCacheAffinityChange(pParse, iRowidReg, 1);
     sqlite3ExprCacheStore(pParse, iCur, -1, iRowidReg);
     VdbeComment((v, "pk"));
     pLevel->op = OP_Noop;
   }else if( pLevel->plan.wsFlags & WHERE_ROWID_RANGE ){
     /* Case 2:  We have an inequality comparison against the ROWID field.

ADDED   test/tkt-fc7bd6358f.test
Index: test/tkt-fc7bd6358f.test
==================================================================
--- test/tkt-fc7bd6358f.test
+++ test/tkt-fc7bd6358f.test
@@ -0,0 +1,78 @@
+# 2013 March 05
+#
+# 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. Specifically,
+# it tests that ticket [fc7bd6358f]:
+#
+# The following SQL yields an incorrect result (zero rows) in all
+# versions of SQLite between 3.6.14 and 3.7.15.2:
+#
+#    CREATE TABLE t(textid TEXT);
+#    INSERT INTO t VALUES('12');
+#    INSERT INTO t VALUES('34');
+#    CREATE TABLE i(intid INTEGER PRIMARY KEY);
+#    INSERT INTO i VALUES(12);
+#    INSERT INTO i VALUES(34);
+#
+#    SELECT t1.textid AS a, i.intid AS b, t2.textid AS c
+#      FROM t t1, i, t t2
+#     WHERE t1.textid = i.intid
+#       AND t1.textid = t2.textid;
+#
+# The correct result should be two rows, one with 12|12|12 and the other
+# with 34|34|34. With this bug, no rows are returned. Bisecting shows that
+# this bug was introduced with check-in [dd4d67a67454] on 2009-04-23. 
+#
+
+set testdir [file dirname $argv0]
+source $testdir/tester.tcl
+
+do_test tkt-fc7bd6358f.100 {
+  db eval {
+    CREATE TABLE t(textid TEXT);
+    INSERT INTO t VALUES('12');
+    INSERT INTO t VALUES('34');
+    CREATE TABLE i(intid INTEGER PRIMARY KEY);
+    INSERT INTO i VALUES(12);
+    INSERT INTO i VALUES(34);
+  }
+} {}
+unset -nocomplain from
+unset -nocomplain where
+unset -nocomplain a
+unset -nocomplain b
+foreach {a from} {
+  1 {FROM t t1, i, t t2}
+  2 {FROM i, t t1, t t2}
+  3 {FROM t t1, t t2, i}
+} {
+  foreach {b where} {
+    1 {WHERE t1.textid=i.intid AND t1.textid=t2.textid}
+    2 {WHERE i.intid=t1.textid AND t1.textid=t2.textid}
+    3 {WHERE t1.textid=i.intid AND i.intid=t2.textid}
+    4 {WHERE t1.textid=i.intid AND t2.textid=i.intid}
+    5 {WHERE i.intid=t1.textid AND i.intid=t2.textid}
+    6 {WHERE i.intid=t1.textid AND t2.textid=i.intid}
+    7 {WHERE t1.textid=t2.textid AND i.intid=t2.textid}
+    8 {WHERE t1.textid=t2.textid AND t2.textid=i.intid}
+  } {
+    do_test tkt-fc7bd6358f.110.$a.$b.1 {
+       db eval {PRAGMA automatic_index=ON}
+       db eval "SELECT t1.textid, i.intid, t2.textid $from $where"
+    } {12 12 12 34 34 34}
+    do_test tkt-fc7bd6358f.110.$a.$b.2 {
+       db eval {PRAGMA automatic_index=OFF}
+       db eval "SELECT t1.textid, i.intid, t2.textid $from $where"
+    } {12 12 12 34 34 34}
+  }
+}
+
+    
+finish_test