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Overview
| Comment: | Use NOT NULL partial indexes when the query is constrained by a single LIKE or GLOB. |
|---|---|
| Downloads: | Tarball | ZIP archive | SQL archive |
| Timelines: | family | ancestors | descendants | both | trunk |
| Files: | files | file ages | folders |
| SHA1: |
9b3a3b41b59a7ce7d3dd82c7402d6fdc |
| User & Date: | drh 2016-11-02 02:17:52 |
Context
|
2016-11-02
| ||
| 13:18 | Fix a requirement mark. No changes to code. check-in: d18f61b7 user: drh tags: trunk | |
| 02:17 | Use NOT NULL partial indexes when the query is constrained by a single LIKE or GLOB. check-in: 9b3a3b41 user: drh tags: trunk | |
|
2016-10-31
| ||
| 16:49 | Add the SQLITE_DBCONFIG_NO_CKPT_ON_CLOSE sqlite3_dbconfig() option - for disabling SQLite's default checkpoint-on-close behaviour. check-in: 6d142025 user: dan tags: trunk | |
Changes
Changes to src/expr.c.
4596 4597 4598 4599 4600 4601 4602 4603 4604 4605 4606 4607 4608 4609 4610 4611 4612 4613 4614 |
}
if( pE2->op==TK_OR
&& (sqlite3ExprImpliesExpr(pE1, pE2->pLeft, iTab)
|| sqlite3ExprImpliesExpr(pE1, pE2->pRight, 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;
}
return 0;
}
/*
** An instance of the following structure is used by the tree walker
** to determine if an expression can be evaluated by reference to the
|
| | | | < |
4596 4597 4598 4599 4600 4601 4602 4603 4604 4605 4606 4607 4608 4609 4610 4611 4612 4613 |
}
if( pE2->op==TK_OR
&& (sqlite3ExprImpliesExpr(pE1, pE2->pLeft, iTab)
|| sqlite3ExprImpliesExpr(pE1, pE2->pRight, iTab) )
){
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;
}
/*
** An instance of the following structure is used by the tree walker
** to determine if an expression can be evaluated by reference to the
|