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Provide hints to the btree layer Next and Previous primitives to let them

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know if they can be no-ops if the underlying index is unique.

FossilOrigin-Name: 6c643e45c274e755dc5a1a65673df79261c774be
This commit is contained in:
drh
2014-02-03 14:04:11 +00:00
parent 6645370e5b
commit e39a732ce2
6 changed files with 62 additions and 25 deletions
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15
src/where.c
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@@ -3184,6 +3184,8 @@ static Bitmask codeOneLoopStart(
pLevel->op = OP_Next;
}
pLevel->p1 = iIdxCur;
assert( (WHERE_UNQ_WANTED>>16)==1 );
pLevel->p3 = (pLoop->wsFlags>>16)&1;
if( (pLoop->wsFlags & WHERE_CONSTRAINT)==0 ){
pLevel->p5 = SQLITE_STMTSTATUS_FULLSCAN_STEP;
}else{
@@ -3986,12 +3988,13 @@ static int whereLoopAddBtreeIndex(
|| nInMul==0
);
pNew->wsFlags |= WHERE_COLUMN_EQ;
if( iCol<0
|| (pProbe->onError!=OE_None && nInMul==0
&& pNew->u.btree.nEq==pProbe->nKeyCol-1)
){
if( iCol<0 || (nInMul==0 && pNew->u.btree.nEq==pProbe->nKeyCol-1)){
assert( (pNew->wsFlags & WHERE_COLUMN_IN)==0 || iCol<0 );
pNew->wsFlags |= WHERE_ONEROW;
if( iCol>=0 && pProbe->onError==OE_None ){
pNew->wsFlags |= WHERE_UNQ_WANTED;
}else{
pNew->wsFlags |= WHERE_ONEROW;
}
}
pNew->u.btree.nEq++;
pNew->nOut = nRowEst + nInMul;
@@ -5785,7 +5788,7 @@ void sqlite3WhereEnd(WhereInfo *pWInfo){
pLoop = pLevel->pWLoop;
sqlite3VdbeResolveLabel(v, pLevel->addrCont);
if( pLevel->op!=OP_Noop ){
sqlite3VdbeAddOp2(v, pLevel->op, pLevel->p1, pLevel->p2);
sqlite3VdbeAddOp3(v, pLevel->op, pLevel->p1, pLevel->p2, pLevel->p3);
sqlite3VdbeChangeP5(v, pLevel->p5);
}
if( pLoop->wsFlags & WHERE_IN_ABLE && pLevel->u.in.nIn>0 ){