diff options
Diffstat (limited to 'src/expr.c')
| -rw-r--r-- | src/expr.c | 11 |
1 files changed, 7 insertions, 4 deletions
diff --git a/src/expr.c b/src/expr.c index 46aea5f3d..27929767c 100644 --- a/src/expr.c +++ b/src/expr.c @@ -4974,13 +4974,16 @@ int sqlite3ExprCompareSkip(Expr *pA, Expr *pB, int iTab){ /* ** Return non-zero if Expr p can only be true if pNN is not NULL. +** +** Or if seenNot is true, return non-zero if Expr p can only be +** non-NULL if pNN is not NULL */ static int exprImpliesNotNull( Parse *pParse, /* Parsing context */ Expr *p, /* The expression to be checked */ Expr *pNN, /* The expression that is NOT NULL */ int iTab, /* Table being evaluated */ - int seenNot /* True if p is an operand of NOT */ + int seenNot /* Return true only if p can be any non-NULL value */ ){ assert( p ); assert( pNN ); @@ -4999,12 +5002,12 @@ static int exprImpliesNotNull( assert( pList!=0 ); assert( pList->nExpr==2 ); if( seenNot ) return 0; - if( exprImpliesNotNull(pParse, pList->a[0].pExpr, pNN, iTab, seenNot) - || exprImpliesNotNull(pParse, pList->a[1].pExpr, pNN, iTab, seenNot) + if( exprImpliesNotNull(pParse, pList->a[0].pExpr, pNN, iTab, 1) + || exprImpliesNotNull(pParse, pList->a[1].pExpr, pNN, iTab, 1) ){ return 1; } - return exprImpliesNotNull(pParse, p->pLeft, pNN, iTab, seenNot); + return exprImpliesNotNull(pParse, p->pLeft, pNN, iTab, 1); } case TK_EQ: case TK_NE: |