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Proposed optimization to the IS NULL and NOT NULL operators that avoids

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loading the entire content of larges strings and BLOBs.  Response to
[forum:/info/3c08d4715dc05b00|forum post 3c08d4715dc05b00].

FossilOrigin-Name: 45f171565442f9fd6574fb93ae7abe83c168b20be68af42531bc55571450d3ab
This commit is contained in:
drh
2022-10-13 12:47:33 +00:00
parent 1ffb6be119
commit e995d2c226
6 changed files with 33 additions and 13 deletions
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2
src/expr.c
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@@ -5241,6 +5241,7 @@ void sqlite3ExprIfTrue(Parse *pParse, Expr *pExpr, int dest, int jumpIfNull){
assert( TK_ISNULL==OP_IsNull ); testcase( op==TK_ISNULL );
assert( TK_NOTNULL==OP_NotNull ); testcase( op==TK_NOTNULL );
r1 = sqlite3ExprCodeTemp(pParse, pExpr->pLeft, &regFree1);
sqlite3VdbeTypeofColumn(v, r1);
sqlite3VdbeAddOp2(v, op, r1, dest);
VdbeCoverageIf(v, op==TK_ISNULL);
VdbeCoverageIf(v, op==TK_NOTNULL);
@@ -5415,6 +5416,7 @@ void sqlite3ExprIfFalse(Parse *pParse, Expr *pExpr, int dest, int jumpIfNull){
case TK_ISNULL:
case TK_NOTNULL: {
r1 = sqlite3ExprCodeTemp(pParse, pExpr->pLeft, &regFree1);
sqlite3VdbeTypeofColumn(v, r1);
sqlite3VdbeAddOp2(v, op, r1, dest);
testcase( op==TK_ISNULL ); VdbeCoverageIf(v, op==TK_ISNULL);
testcase( op==TK_NOTNULL ); VdbeCoverageIf(v, op==TK_NOTNULL);