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Overview
| Comment: | Try to factor constant subcomponents of the WHERE clause out of the loop. |
|---|---|
| Downloads: | Tarball | ZIP archive | SQL archive |
| Timelines: | family | ancestors | descendants | both | trunk |
| Files: | files | file ages | folders |
| SHA1: | 9d05777fe24e1a5ce71762de38db8409 |
| User & Date: | drh 2014-01-02 21:05:10 |
Context
|
2014-01-03
| ||
| 16:03 | Avoid some unnecessary OP_SCopy operations when inserting into a table with multiple indices. check-in: 429018b1 user: drh tags: trunk | |
|
2014-01-02
| ||
| 21:05 | Try to factor constant subcomponents of the WHERE clause out of the loop. check-in: 9d05777f user: drh tags: trunk | |
| 19:35 | Avoid unnecessary affinity transformations when building indices using data from a table. check-in: 10d85135 user: drh tags: trunk | |
Changes
Changes to src/where.c.
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whereClauseInit(&pWInfo->sWC, pWInfo);
whereSplit(&pWInfo->sWC, pWhere, TK_AND);
sqlite3CodeVerifySchema(pParse, -1); /* Insert the cookie verifier Goto */
/* Special case: a WHERE clause that is constant. Evaluate the
** expression and either jump over all of the code or fall thru.
*/
if( pWhere && (nTabList==0 || sqlite3ExprIsConstantNotJoin(pWhere)) ){
sqlite3ExprIfFalse(pParse, pWhere, pWInfo->iBreak, SQLITE_JUMPIFNULL);
pWhere = 0;
}
/* Special case: No FROM clause
*/
if( nTabList==0 ){
if( pOrderBy ) pWInfo->bOBSat = 1;
if( wctrlFlags & WHERE_WANT_DISTINCT ){
|
> | > | < > > |
5426 5427 5428 5429 5430 5431 5432 5433 5434 5435 5436 5437 5438 5439 5440 5441 5442 5443 5444 5445 |
whereClauseInit(&pWInfo->sWC, pWInfo);
whereSplit(&pWInfo->sWC, pWhere, TK_AND);
sqlite3CodeVerifySchema(pParse, -1); /* Insert the cookie verifier Goto */
/* Special case: a WHERE clause that is constant. Evaluate the
** expression and either jump over all of the code or fall thru.
*/
for(ii=0; ii<sWLB.pWC->nTerm; ii++){
if( nTabList==0 || sqlite3ExprIsConstantNotJoin(sWLB.pWC->a[ii].pExpr) ){
sqlite3ExprIfFalse(pParse, sWLB.pWC->a[ii].pExpr, pWInfo->iBreak,
SQLITE_JUMPIFNULL);
sWLB.pWC->a[ii].wtFlags |= TERM_CODED;
}
}
/* Special case: No FROM clause
*/
if( nTabList==0 ){
if( pOrderBy ) pWInfo->bOBSat = 1;
if( wctrlFlags & WHERE_WANT_DISTINCT ){
|