Many hyperlinks are disabled.
Use anonymous login
to enable hyperlinks.
Overview
| Comment: | Fix the covering index OR optimization (check-in [fcbd6abd]) so that it works with SQLITE_MAX_ATTACHED>30. Broken by a bad cherry-pick merge. |
|---|---|
| Downloads: | Tarball | ZIP archive | SQL archive |
| Timelines: | family | ancestors | descendants | both | branch-3.8.9 |
| Files: | files | file ages | folders |
| SHA3-256: |
d227de8ad9cf757f30f5415ca8fccff3 |
| User & Date: | drh 2017-07-08 01:01:08 |
Context
|
2017-07-17
| ||
| 19:37 | Try to push relevant WHERE clause terms of the outer query down into the subquery in order to help the subquery run faster and/or use less memory. This is a cherry-pick of [6df18e949d36] with bug fixes. (check-in: cd6ac078 user: drh tags: branch-3.8.9) | |
| 19:07 | For FROM-clause subqueries that cannot be flattened, try to push relevant WHERE clause terms of the outer query down into the subquery in order to help the subquery run faster and/or use less memory. Cherry-pick from [6df18e949d36]. Still need to backport bug fixes associated with that check-in. (check-in: 043d6ce8 user: drh tags: push-down-backport) | |
|
2017-07-08
| ||
| 01:01 | Fix the covering index OR optimization (check-in [fcbd6abd]) so that it works with SQLITE_MAX_ATTACHED>30. Broken by a bad cherry-pick merge. (check-in: d227de8a user: drh tags: branch-3.8.9) | |
|
2017-07-05
| ||
| 16:20 | Make use of covering indexes in the OR optimization. (check-in: fcbd6abd user: drh tags: branch-3.8.9) | |
Changes
Changes to src/where.c.
3277 3278 3279 3280 3281 3282 3283 3284 3285 3286 3287 3288 3289 3290 3291 |
Vdbe *v = pParse->pVdbe; /* Vdbe to generate code within */
assert( iIdxCur>0 );
assert( pIdx->aiColumn[pIdx->nColumn-1]==-1 );
sqlite3VdbeAddOp3(v, OP_Seek, iCur, iRowid, iIdxCur);
if( (pWInfo->wctrlFlags & WHERE_FORCE_TABLE)
&& sqlite3ParseToplevel(pParse)->writeMask==0
){
int i;
Table *pTab = pIdx->pTable;
int *ai = (int*)sqlite3DbMallocZero(pParse->db, sizeof(int)*(pTab->nCol+1));
if( ai ){
ai[0] = pTab->nCol;
for(i=0; i<pIdx->nColumn-1; i++){
|
| |
3277 3278 3279 3280 3281 3282 3283 3284 3285 3286 3287 3288 3289 3290 3291 |
Vdbe *v = pParse->pVdbe; /* Vdbe to generate code within */ assert( iIdxCur>0 ); assert( pIdx->aiColumn[pIdx->nColumn-1]==-1 ); sqlite3VdbeAddOp3(v, OP_Seek, iCur, iRowid, iIdxCur); if( (pWInfo->wctrlFlags & WHERE_FORCE_TABLE) && DbMaskAllZero(sqlite3ParseToplevel(pParse)->writeMask) ){ int i; Table *pTab = pIdx->pTable; int *ai = (int*)sqlite3DbMallocZero(pParse->db, sizeof(int)*(pTab->nCol+1)); if( ai ){ ai[0] = pTab->nCol; for(i=0; i<pIdx->nColumn-1; i++){ |