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Set the TF_StatsUsed flag on tables when the query planner outcome is

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affected by the sqlite_stat1 data.  Also, change the column names of the
"PRAGMA stats" command so that they are not keywords.

FossilOrigin-Name: fb2b8ae8310e4ea4b42354bbf36c3084a9d5c6d7
This commit is contained in:
drh
2017-02-17 15:26:36 +00:00
parent 33bec3f5e8
commit a3928dd7be
8 changed files with 165 additions and 22 deletions
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13
src/where.c
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@@ -2387,6 +2387,11 @@ static int whereLoopAddBtreeIndex(
continue;
}
if( IsUniqueIndex(pProbe) && saved_nEq==pProbe->nKeyCol-1 ){
pBuilder->bldFlags |= SQLITE_BLDF_UNIQUE;
}else{
pBuilder->bldFlags |= SQLITE_BLDF_INDEXED;
}
pNew->wsFlags = saved_wsFlags;
pNew->u.btree.nEq = saved_nEq;
pNew->u.btree.nBtm = saved_nBtm;
@@ -2934,7 +2939,15 @@ static int whereLoopAddBtree(
}
}
pBuilder->bldFlags = 0;
rc = whereLoopAddBtreeIndex(pBuilder, pSrc, pProbe, 0);
if( pBuilder->bldFlags==SQLITE_BLDF_INDEXED ){
/* If a non-unique index is used, or if a prefix of the key for
** unique index is used (making the index functionally non-unique)
** then the sqlite_stat1 data becomes important for scoring the
** plan */
pTab->tabFlags |= TF_StatsUsed;
}
#ifdef SQLITE_ENABLE_STAT3_OR_STAT4
sqlite3Stat4ProbeFree(pBuilder->pRec);
pBuilder->nRecValid = 0;