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Overview
Comment:Do not attempt to create an automatic index on a constant constraint, as doing so is pointless.
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SHA1: d6883e960f61365729f279a3c1f2c050beb49a55
User & Date: drh 2014-06-17 02:46:55.317
Context
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: 58acc2a8b3 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: d6883e960f 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: fc918f7d33 user: mistachkin tags: trunk)
Changes
Unified Diff Ignore Whitespace Patch
Changes to src/where.c.
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   && !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
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   && !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
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