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The query planner tries to avoids using indexes that use unknown collating

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functions.

FossilOrigin-Name: 02013fc120bf71a8be3550c696a588af8c92f2209f8e5db530624878ddc8aa7e
This commit is contained in:
drh
2017-12-08 19:37:04 +00:00
parent 21540ae479
commit 7e8515d8be
8 changed files with 41 additions and 31 deletions
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10
src/where.c
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@@ -2879,6 +2879,7 @@ static int whereLoopAddBtree(
testcase( pNew->iTab!=pSrc->iCursor ); /* See ticket [98d973b8f5] */
continue; /* Partial index inappropriate for this query */
}
if( pProbe->bNoQuery ) continue;
rSize = pProbe->aiRowLogEst[0];
pNew->u.btree.nEq = 0;
pNew->u.btree.nBtm = 0;
@@ -4870,16 +4871,7 @@ WhereInfo *sqlite3WhereBegin(
assert( iIndexCur>=0 );
if( op ){
sqlite3VdbeAddOp3(v, op, iIndexCur, pIx->tnum, iDb);
/* If the index is only being scanned - if there is no searching -
** then no collating functions are required. Set db->init.busy in that
** case, to prevent sqlite3VdbeSetP4KeyInfo() from raising needless
** errors about the missing collating functions. */
assert( db->init.busy==0 );
db->init.busy = (pLoop->wsFlags & ~(WHERE_IDX_ONLY|WHERE_INDEXED))==0;
sqlite3VdbeSetP4KeyInfo(pParse, pIx);
db->init.busy = 0; /* Restore db->init.busy */
if( (pLoop->wsFlags & WHERE_CONSTRAINT)!=0
&& (pLoop->wsFlags & (WHERE_COLUMN_RANGE|WHERE_SKIPSCAN))==0
&& (pWInfo->wctrlFlags&WHERE_ORDERBY_MIN)==0