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Fix a false-postive in the sqlite3ExprImpliesNonNullRow() decision routine,

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that resulted in an incorrect LEFT JOIN strength reduction when the
WHERE clause contained a row-value comparison.
Ticket [02aa2bd02f97d0f2]

FossilOrigin-Name: ea20068e6d97c9349ebcc7d0a01e99ebf08c6f44363f71a0218a1abea209adc5
This commit is contained in:
drh
2019-11-04 02:05:52 +00:00
parent db535390db
commit 6c68d7592f
4 changed files with 33 additions and 9 deletions
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4
src/expr.c
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@@ -5212,7 +5212,7 @@ int sqlite3ExprImpliesExpr(Parse *pParse, Expr *pE1, Expr *pE2, int iTab){
}
/*
** This is the Expr node callback for sqlite3ExprImpliesNotNullRow().
** This is the Expr node callback for sqlite3ExprImpliesNonNullRow().
** If the expression node requires that the table at pWalker->iCur
** have one or more non-NULL column, then set pWalker->eCode to 1 and abort.
**
@@ -5230,6 +5230,7 @@ static int impliesNotNullRow(Walker *pWalker, Expr *pExpr){
case TK_NOTNULL:
case TK_IS:
case TK_OR:
case TK_VECTOR:
case TK_CASE:
case TK_IN:
case TK_FUNCTION:
@@ -5239,6 +5240,7 @@ static int impliesNotNullRow(Walker *pWalker, Expr *pExpr){
testcase( pExpr->op==TK_NOTNULL );
testcase( pExpr->op==TK_IS );
testcase( pExpr->op==TK_OR );
testcase( pExpr->op==TK_VECTOR );
testcase( pExpr->op==TK_CASE );
testcase( pExpr->op==TK_IN );
testcase( pExpr->op==TK_FUNCTION );