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Simplified VDBE code for the vector NOT IN null-scanning loop.

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FossilOrigin-Name: 7ae504e62e9bbbbd85a676f3c3922b7fd0cc73d2
This commit is contained in:
drh
2016-08-24 21:54:47 +00:00
parent 72e26dec86
commit 18016ad2bb
3 changed files with 19 additions and 17 deletions
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22
src/expr.c
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@@ -2782,18 +2782,20 @@ static void sqlite3ExprCodeIN(
if( nVector>1 && destIfNull!=destIfFalse ){
int iIdx = pExpr->iTable;
int addr;
int addrTop;
int addrNext;
int addrFound;
/* Search the index for the key. */
addr = sqlite3VdbeAddOp4Int(v, OP_Found, iIdx, 0, r1, nVector);
addrFound = sqlite3VdbeAddOp4Int(v, OP_Found, iIdx, 0, r1, nVector);
VdbeCoverage(v);
/* At this point the specified key is not present in the index,
** so the result of the IN(..) operator must be either NULL or
** 0. The vdbe code generated below figures out which. */
addrNext = 1+sqlite3VdbeAddOp2(v, OP_Rewind, iIdx, destIfFalse);
addrTop = 1+sqlite3VdbeAddOp2(v, OP_Rewind, iIdx, destIfFalse);
VdbeCoverage(v);
addrNext = sqlite3VdbeMakeLabel(v);
for(i=0; i<nVector; i++){
Expr *p;
@@ -2803,21 +2805,21 @@ static void sqlite3ExprCodeIN(
pColl = sqlite3ExprCollSeq(pParse, p);
sqlite3VdbeAddOp3(v, OP_Column, iIdx, i, r2);
sqlite3VdbeAddOp4(v, OP_Eq, r1+i, 0, r2, (void*)pColl,P4_COLLSEQ);
sqlite3VdbeChangeP5(v, SQLITE_JUMPIFNULL);
sqlite3VdbeAddOp4(v, OP_Ne, r1+i, addrNext, r2,
(void*)pColl, P4_COLLSEQ);
VdbeCoverage(v);
sqlite3VdbeAddOp2(v, OP_Next, iIdx, addrNext);
VdbeCoverage(v);
sqlite3VdbeAddOp2(v, OP_Goto, 0, destIfFalse);
sqlite3VdbeJumpHere(v, sqlite3VdbeCurrentAddr(v)-3);
sqlite3ReleaseTempReg(pParse, r2);
}
sqlite3VdbeAddOp2(v, OP_Goto, 0, destIfNull);
sqlite3VdbeResolveLabel(v, addrNext);
sqlite3VdbeAddOp2(v, OP_Next, iIdx, addrTop);
VdbeCoverage(v);
sqlite3VdbeAddOp2(v, OP_Goto, 0, destIfFalse);
/* The key was found in the index. If it contains any NULL values,
** then the result of the IN(...) operator is NULL. Otherwise, the
** result is 1. */
sqlite3VdbeJumpHere(v, addr);
sqlite3VdbeJumpHere(v, addrFound);
for(i=0; i<nVector; i++){
Expr *p = sqlite3VectorFieldSubexpr(pExpr->pLeft, i);
if( sqlite3ExprCanBeNull(p) ){