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Use NOT NULL partial indexes when the query is constrained by a single

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LIKE or GLOB.

FossilOrigin-Name: 9b3a3b41b59a7ce7d3dd82c7402d6fdc6a5ca43c
This commit is contained in:
drh
2016-11-02 02:17:52 +00:00
parent d7265378fd
commit 1ad93a003d
3 changed files with 12 additions and 14 deletions
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9
src/expr.c
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@@ -4600,11 +4600,10 @@ int sqlite3ExprImpliesExpr(Expr *pE1, Expr *pE2, int iTab){
){
return 1;
}
if( pE2->op==TK_NOTNULL
&& sqlite3ExprCompare(pE1->pLeft, pE2->pLeft, iTab)==0
&& (pE1->op!=TK_ISNULL && pE1->op!=TK_IS)
){
return 1;
if( pE2->op==TK_NOTNULL && pE1->op!=TK_ISNULL && pE1->op!=TK_IS ){
Expr *pX = sqlite3ExprSkipCollate(pE1->pLeft);
testcase( pX!=pE1->pLeft );
if( sqlite3ExprCompare(pX, pE2->pLeft, iTab)==0 ) return 1;
}
return 0;
}