SQLite

}

/*
** Copy the contents of sample *pNew into the p->a[] array. If necessary,
** remove the least desirable sample from p->a[] to make room.
*/
static void sampleInsert(Stat4Accum *p, Stat4Sample *pNew, int nEqZero){
  Stat4Sample *pSample = 0;
  int i;

  assert( IsStat4 || nEqZero==0 );

#ifdef SQLITE_ENABLE_STAT4
  if( pNew->isPSample==0 ){
    Stat4Sample *pUpgrade = 0;

    Stat4Sample *pMin = &p->a[p->iMin];
    tRowcnt *anEq = pMin->anEq;
    tRowcnt *anLt = pMin->anLt;
    tRowcnt *anDLt = pMin->anDLt;
    sampleClear(p->db, pMin);
    memmove(pMin, &pMin[1], sizeof(p->a[0])*(p->nSample-p->iMin-1));
    pSample = &p->a[p->nSample-1];
    pSample->nRowid = 0;
    pSample->anEq = anEq;
    pSample->anDLt = anDLt;
    pSample->anLt = anLt;
    p->nSample = p->mxSample-1;
  }

  /* The "rows less-than" for the rowid column must be greater than that

  if( p ){
    UnpackedRecord *pRec = p->ppRec[0];

    if( pRec==0 ){
      Index *pIdx = p->pIdx;      /* Index being probed */
      int nByte;                  /* Bytes of space to allocate */
      int i;                      /* Counter variable */
      int nCol = pIdx->nColumn;   /* Number of index columns including rowid */
  
      nByte = sizeof(Mem) * nCol + sizeof(UnpackedRecord);
      pRec = (UnpackedRecord*)sqlite3DbMallocZero(db, nByte);
      if( pRec ){
        pRec->pKeyInfo = sqlite3IndexKeyinfo(p->pParse, pIdx);
        if( pRec->pKeyInfo ){
          assert( pRec->pKeyInfo->nField+pRec->pKeyInfo->nXField==nCol );

# 2013-11-04
#
# 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.
#
#***********************************************************************
#
# Test cases for partial indices in WITHOUT ROWID tables
#


set testdir [file dirname $argv0]
source $testdir/tester.tcl

ifcapable !vtab {
  finish_test
  return
}

load_static_extension db wholenumber;
do_test index7-1.1 {
  # Able to parse and manage partial indices
  execsql {
    CREATE TABLE t1(a,b,c PRIMARY KEY) WITHOUT rowid;
    CREATE INDEX t1a ON t1(a) WHERE a IS NOT NULL;
    CREATE INDEX t1b ON t1(b) WHERE b>10;
    CREATE VIRTUAL TABLE nums USING wholenumber;
    INSERT INTO t1(a,b,c)
       SELECT CASE WHEN value%3!=0 THEN value END, value, value
         FROM nums WHERE value<=20;
    SELECT count(a), count(b) FROM t1;
    PRAGMA integrity_check;
  }
} {14 20 ok}

# Make sure the count(*) optimization works correctly with
# partial indices.  Ticket [a5c8ed66cae16243be6] 2013-10-03.
#
do_execsql_test index7-1.1.1 {
  SELECT count(*) FROM t1;
} {20}

# Error conditions during parsing...
#
do_test index7-1.2 {
  catchsql {
    CREATE INDEX bad1 ON t1(a,b) WHERE x IS NOT NULL;
  }
} {1 {no such column: x}}
do_test index7-1.3 {
  catchsql {
    CREATE INDEX bad1 ON t1(a,b) WHERE EXISTS(SELECT * FROM t1);
  }
} {1 {subqueries prohibited in partial index WHERE clauses}}
do_test index7-1.4 {
  catchsql {
    CREATE INDEX bad1 ON t1(a,b) WHERE a!=?1;
  }
} {1 {parameters prohibited in partial index WHERE clauses}}
do_test index7-1.5 {
  catchsql {
    CREATE INDEX bad1 ON t1(a,b) WHERE a!=random();
  }
} {1 {functions prohibited in partial index WHERE clauses}}
do_test index7-1.6 {
  catchsql {
    CREATE INDEX bad1 ON t1(a,b) WHERE a NOT LIKE 'abc%';
  }
} {1 {functions prohibited in partial index WHERE clauses}}

do_test index7-1.10 {
  execsql {
    ANALYZE;
    SELECT idx, stat FROM sqlite_stat1 ORDER BY idx;
    PRAGMA integrity_check;
  }
} {t1 {20 1} t1a {14 1} t1b {10 1} ok}

# STAT1 shows the partial indices have a reduced number of
# rows.
#
do_test index7-1.11 {
  execsql {
    UPDATE t1 SET a=b;
    ANALYZE;
    SELECT idx, stat FROM sqlite_stat1 ORDER BY idx;
    PRAGMA integrity_check;
  }
} {t1 {20 1} t1a {20 1} t1b {10 1} ok}

do_test index7-1.11b {
  execsql {
    UPDATE t1 SET a=NULL WHERE b%3!=0;
    UPDATE t1 SET b=b+100;
    ANALYZE;
    SELECT idx, stat FROM sqlite_stat1 ORDER BY idx;
    PRAGMA integrity_check;
  }
} {t1 {20 1} t1a {6 1} t1b {20 1} ok}

do_test index7-1.12 {
  execsql {
    UPDATE t1 SET a=CASE WHEN b%3!=0 THEN b END;
    UPDATE t1 SET b=b-100;
    ANALYZE;
    SELECT idx, stat FROM sqlite_stat1 ORDER BY idx;
    PRAGMA integrity_check;
  }
} {t1 {20 1} t1a {13 1} t1b {10 1} ok}

do_test index7-1.13 {
  execsql {
    DELETE FROM t1 WHERE b BETWEEN 8 AND 12;
    ANALYZE;
    SELECT idx, stat FROM sqlite_stat1 ORDER BY idx;
    PRAGMA integrity_check;
  }
} {t1 {15 1} t1a {10 1} t1b {8 1} ok}

do_test index7-1.14 {
  execsql {
    REINDEX;
    ANALYZE;
    SELECT idx, stat FROM sqlite_stat1 ORDER BY idx;
    PRAGMA integrity_check;
  }
} {t1 {15 1} t1a {10 1} t1b {8 1} ok}

do_test index7-1.15 {
  execsql {
    CREATE INDEX t1c ON t1(c);
    ANALYZE;
    SELECT idx, stat FROM sqlite_stat1 ORDER BY idx;
    PRAGMA integrity_check;
  }
} {t1 {15 1} t1a {10 1} t1b {8 1} t1c {15 1} ok}

# Queries use partial indices as appropriate times.
#
do_test index7-2.1 {
  execsql {
    CREATE TABLE t2(a,b PRIMARY KEY) without rowid;
    INSERT INTO t2(a,b) SELECT value, value FROM nums WHERE value<1000;
    UPDATE t2 SET a=NULL WHERE b%5==0;
    CREATE INDEX t2a1 ON t2(a) WHERE a IS NOT NULL;
    SELECT count(*) FROM t2 WHERE a IS NOT NULL;
  }
} {800}
do_test index7-2.2 {
  execsql {
    EXPLAIN QUERY PLAN
    SELECT * FROM t2 WHERE a=5;
  }
} {/.* TABLE t2 USING COVERING INDEX t2a1 .*/}
ifcapable stat4||stat3 {
  do_test index7-2.3stat4 {
    execsql {
      EXPLAIN QUERY PLAN
      SELECT * FROM t2 WHERE a IS NOT NULL;
    }
  } {/.* TABLE t2 USING COVERING INDEX t2a1 .*/}
} else {
  do_test index7-2.3stat4 {
    execsql {
      EXPLAIN QUERY PLAN
      SELECT * FROM t2 WHERE a IS NOT NULL AND a>0;
    }
  } {/.* TABLE t2 USING COVERING INDEX t2a1 .*/}
}
do_test index7-2.4 {
  execsql {
    EXPLAIN QUERY PLAN
    SELECT * FROM t2 WHERE a IS NULL;
  }
} {~/.*INDEX t2a1.*/}

do_execsql_test index7-2.101 {
  DROP INDEX t2a1;
  UPDATE t2 SET a=b, b=b+10000;
  SELECT b FROM t2 WHERE a=15;
} {10015}
do_execsql_test index7-2.102 {
  CREATE INDEX t2a2 ON t2(a) WHERE a<100 OR a>200;
  SELECT b FROM t2 WHERE a=15;
  PRAGMA integrity_check;
} {10015 ok}
do_execsql_test index7-2.102eqp {
  EXPLAIN QUERY PLAN
  SELECT b FROM t2 WHERE a=15;
} {~/.*INDEX t2a2.*/}
do_execsql_test index7-2.103 {
  SELECT b FROM t2 WHERE a=15 AND a<100;
} {10015}
do_execsql_test index7-2.103eqp {
  EXPLAIN QUERY PLAN
  SELECT b FROM t2 WHERE a=15 AND a<100;
} {/.*INDEX t2a2.*/}
do_execsql_test index7-2.104 {
  SELECT b FROM t2 WHERE a=515 AND a>200;
} {10515}
do_execsql_test index7-2.104eqp {
  EXPLAIN QUERY PLAN
  SELECT b FROM t2 WHERE a=515 AND a>200;
} {/.*INDEX t2a2.*/}

# Partial UNIQUE indices
#
do_execsql_test index7-3.1 {
  CREATE TABLE t3(a,b PRIMARY KEY) without rowid;
  INSERT INTO t3 SELECT value, value FROM nums WHERE value<200;
  UPDATE t3 SET a=999 WHERE b%5!=0;
  CREATE UNIQUE INDEX t3a ON t3(a) WHERE a<>999;
} {}
do_test index7-3.2 {
  # unable to insert a duplicate row a-value that is not 999.
  catchsql {
    INSERT INTO t3(a,b) VALUES(150, 'test1');
  }
} {1 {column a is not unique}}
do_test index7-3.3 {
  # can insert multiple rows with a==999 because such rows are not
  # part of the unique index.
  catchsql {
    INSERT INTO t3(a,b) VALUES(999, 'test1'), (999, 'test2');
  }
} {0 {}}
do_execsql_test index7-3.4 {
  SELECT count(*) FROM t3 WHERE a=999;
} {162}
integrity_check index7-3.5

do_execsql_test index7-4.0 {
  VACUUM;
  PRAGMA integrity_check;
} {ok}

# Silently ignore database name qualifiers in partial indices.
#
do_execsql_test index7-5.0 {
  CREATE INDEX t3b ON t3(b) WHERE xyzzy.t3.b BETWEEN 5 AND 10;
                               /* ^^^^^-- ignored */
  ANALYZE;
  SELECT count(*) FROM t3 WHERE t3.b BETWEEN 5 AND 10;
  SELECT stat+0 FROM sqlite_stat1 WHERE idx='t3b';
} {6 6}

finish_test