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Overview
| Comment: | Do not attempt to create an automatic index on a constant constraint, as doing so is pointless. |
|---|---|
| Downloads: | Tarball | ZIP archive | SQL archive |
| Timelines: | family | ancestors | descendants | both | autoindex-improvements |
| Files: | files | file ages | folders |
| SHA1: |
d6883e960f61365729f279a3c1f2c050 |
| User & Date: | drh 2014-06-17 02:46:55 |
Context
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2014-06-17
| ||
| 09:00 | Allow an automatic index on a WHERE constraint where the RHS is does not reference another table as long as the RHS is not a constant. (check-in: 58acc2a8 user: drh tags: autoindex-improvements) | |
| 02:46 | Do not attempt to create an automatic index on a constant constraint, as doing so is pointless. (check-in: d6883e96 user: drh tags: autoindex-improvements) | |
|
2014-06-16
| ||
| 22:45 | Fix CSV import issue, reported via the mailing list, in the shell when the file to be imported ends with an empty line. (check-in: fc918f7d user: mistachkin tags: trunk) | |
Changes
Changes to src/where.c.
4525 4526 4527 4528 4529 4530 4531 4532 4533 4534 4535 4536 4537 4538 |
&& !pSrc->isRecursive
){
/* Generate auto-index WhereLoops */
WhereTerm *pTerm;
WhereTerm *pWCEnd = pWC->a + pWC->nTerm;
for(pTerm=pWC->a; rc==SQLITE_OK && pTerm<pWCEnd; pTerm++){
if( pTerm->prereqRight & pNew->maskSelf ) continue;
if( termCanDriveIndex(pTerm, pSrc, 0) ){
pNew->u.btree.nEq = 1;
pNew->u.btree.nSkip = 0;
pNew->u.btree.pIndex = 0;
pNew->nLTerm = 1;
pNew->aLTerm[0] = pTerm;
/* TUNING: One-time cost for computing the automatic index is
|
> |
4525 4526 4527 4528 4529 4530 4531 4532 4533 4534 4535 4536 4537 4538 4539 |
&& !pSrc->isRecursive
){
/* Generate auto-index WhereLoops */
WhereTerm *pTerm;
WhereTerm *pWCEnd = pWC->a + pWC->nTerm;
for(pTerm=pWC->a; rc==SQLITE_OK && pTerm<pWCEnd; pTerm++){
if( pTerm->prereqRight & pNew->maskSelf ) continue;
if( pTerm->prereqRight==0 ) continue;
if( termCanDriveIndex(pTerm, pSrc, 0) ){
pNew->u.btree.nEq = 1;
pNew->u.btree.nSkip = 0;
pNew->u.btree.pIndex = 0;
pNew->nLTerm = 1;
pNew->aLTerm[0] = pTerm;
/* TUNING: One-time cost for computing the automatic index is
|