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Overview
| Comment: | Remove an unnecessary conditional. |
|---|---|
| Downloads: | Tarball | ZIP archive | SQL archive |
| Timelines: | family | ancestors | descendants | both | query-plan-experiments |
| Files: | files | file ages | folders |
| SHA1: |
7473c4dfc10a47594affa6f4e071a08d |
| User & Date: | drh 2014-03-31 20:05:20 |
Context
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2014-04-04
| ||
| 18:20 | Merge changes to the query planner that strive to ensure that any index usage that is a proper subset of some other index usage always has a slightly higher cost. check-in: 683dd379 user: drh tags: trunk | |
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2014-03-31
| ||
| 20:05 | Remove an unnecessary conditional. Closed-Leaf check-in: 7473c4df user: drh tags: query-plan-experiments | |
| 19:49 | Also make sure an index that is a proper subset of some other index has a higher cost than that other index. Add test cases. check-in: b7830d23 user: drh tags: query-plan-experiments | |
Changes
Changes to src/where.c.
3713 3713 3714 3714 /* 3715 3715 ** Return TRUE if the set of WHERE clause terms used by pA is a proper 3716 3716 ** subset of the WHERE clause terms used by pB. 3717 3717 */ 3718 3718 static int whereLoopProperSubset(const WhereLoop *pA, const WhereLoop *pB){ 3719 3719 int i, j; 3720 - if( pA->nLTerm>=pB->nLTerm ) return 0; 3720 + assert( pA->nLTerm<pB->nLTerm ); /* Checked by calling function */ 3721 3721 for(j=0, i=pA->nLTerm-1; i>=0 && j>=0; i--){ 3722 3722 for(j=pB->nLTerm-1; j>=0; j--){ 3723 3723 if( pB->aLTerm[j]==pA->aLTerm[i] ) break; 3724 3724 } 3725 3725 } 3726 3726 return j>=0; 3727 3727 }