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Consolidate more of the DISTINCT processing logic into a single spot in the

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code.  Reduce the number of OP_Column operations needed to perform a
WHERE_DISTINCT_ORDERED.

FossilOrigin-Name: 79e922f7ae29bbe06d639d648fbd72523cf9a28e
This commit is contained in:
drh
2012-09-21 00:04:28 +00:00
parent 634d81dee0
commit e8e4af7697
7 changed files with 128 additions and 113 deletions
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16
src/expr.c
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@@ -2263,8 +2263,8 @@ void sqlite3ExprCacheAffinityChange(Parse *pParse, int iStart, int iCount){
void sqlite3ExprCodeMove(Parse *pParse, int iFrom, int iTo, int nReg){
int i;
struct yColCache *p;
if( NEVER(iFrom==iTo) ) return;
sqlite3VdbeAddOp3(pParse->pVdbe, OP_Move, iFrom, iTo, nReg);
assert( iFrom>=iTo+nReg || iFrom+nReg<=iTo );
sqlite3VdbeAddOp3(pParse->pVdbe, OP_Move, iFrom, iTo, nReg-1);
for(i=0, p=pParse->aColCache; i<SQLITE_N_COLCACHE; i++, p++){
int x = p->iReg;
if( x>=iFrom && x<iFrom+nReg ){
@@ -2273,18 +2273,6 @@ void sqlite3ExprCodeMove(Parse *pParse, int iFrom, int iTo, int nReg){
}
}
/*
** Generate code to copy content from registers iFrom...iFrom+nReg-1
** over to iTo..iTo+nReg-1.
*/
void sqlite3ExprCodeCopy(Parse *pParse, int iFrom, int iTo, int nReg){
int i;
if( NEVER(iFrom==iTo) ) return;
for(i=0; i<nReg; i++){
sqlite3VdbeAddOp2(pParse->pVdbe, OP_Copy, iFrom+i, iTo+i);
}
}
#if defined(SQLITE_DEBUG) || defined(SQLITE_COVERAGE_TEST)
/*
** Return true if any register in the range iFrom..iTo (inclusive)