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Overview
| Comment: | Increase the estimated full-scan cost for an FTS3 table. |
|---|---|
| Downloads: | Tarball | ZIP archive | SQL archive |
| Timelines: | family | ancestors | descendants | both | nextgen-query-plan-exp |
| Files: | files | file ages | folders |
| SHA1: | 8d9f29f847f38612447c79a5fb366a91 |
| User & Date: | drh 2013-06-04 13:07:44 |
Context
|
2013-06-04
| ||
| 13:37 | Better determination of when an index is UNIQUE. check-in: 63fd025a user: drh tags: nextgen-query-plan-exp | |
| 13:07 | Increase the estimated full-scan cost for an FTS3 table. check-in: 8d9f29f8 user: drh tags: nextgen-query-plan-exp | |
| 12:58 | Fix a display issue with EXPLAIN QUERY PLAN. check-in: ff2fa407 user: drh tags: nextgen-query-plan-exp | |
Changes
Changes to ext/fts3/fts3.c.
1419 1420 1421 1422 1423 1424 1425 1426 1427 1428 1429 1430 1431 1432 1433 |
int iLangidCons = -1; /* Index of langid=x constraint, if present */
/* By default use a full table scan. This is an expensive option,
** so search through the constraints to see if a more efficient
** strategy is possible.
*/
pInfo->idxNum = FTS3_FULLSCAN_SEARCH;
pInfo->estimatedCost = 500000;
for(i=0; i<pInfo->nConstraint; i++){
struct sqlite3_index_constraint *pCons = &pInfo->aConstraint[i];
if( pCons->usable==0 ) continue;
/* A direct lookup on the rowid or docid column. Assign a cost of 1.0. */
if( iCons<0
&& pCons->op==SQLITE_INDEX_CONSTRAINT_EQ
|
| |
1419 1420 1421 1422 1423 1424 1425 1426 1427 1428 1429 1430 1431 1432 1433 |
int iLangidCons = -1; /* Index of langid=x constraint, if present */
/* By default use a full table scan. This is an expensive option,
** so search through the constraints to see if a more efficient
** strategy is possible.
*/
pInfo->idxNum = FTS3_FULLSCAN_SEARCH;
pInfo->estimatedCost = 5000000;
for(i=0; i<pInfo->nConstraint; i++){
struct sqlite3_index_constraint *pCons = &pInfo->aConstraint[i];
if( pCons->usable==0 ) continue;
/* A direct lookup on the rowid or docid column. Assign a cost of 1.0. */
if( iCons<0
&& pCons->op==SQLITE_INDEX_CONSTRAINT_EQ
|