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Overview
Comment:Fix the generate_series virtual table so that it correctly returns no rows if any of its constraints are NULL. Ticket [fac496b61722daf28].
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SHA3-256: 3328e828e28ca7198fd1ce84503e649ab2278913a2cf85a0f0391f31d0c9c8d7
User & Date: drh 2018-04-03 14:25:51
Context
2018-04-03
17:05
Fix a few small test script issues affecting SQLITE_TEMP_STORE=3 builds. check-in: e171f372 user: dan tags: trunk
14:25
Fix the generate_series virtual table so that it correctly returns no rows if any of its constraints are NULL. Ticket [fac496b61722daf28]. check-in: 3328e828 user: drh tags: trunk
14:04
Change the LEFT JOIN strength reduction optimization so that assumes that virtual table constraints can be true even if terms within the constraint are NULL. This works around dodgy virtual table implementations. Fix for ticket [fac496b61722daf2]. check-in: cbb977fe user: drh tags: trunk
Changes
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Changes to ext/misc/series.c.

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    pCur->mxValue = 0xffffffff;
  }
  if( idxNum & 4 ){
    pCur->iStep = sqlite3_value_int64(argv[i++]);
    if( pCur->iStep<1 ) pCur->iStep = 1;
  }else{
    pCur->iStep = 1;









  }
  if( idxNum & 8 ){
    pCur->isDesc = 1;
    pCur->iValue = pCur->mxValue;
    if( pCur->iStep>0 ){
      pCur->iValue -= (pCur->mxValue - pCur->mnValue)%pCur->iStep;
    }







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    pCur->mxValue = 0xffffffff;
  }
  if( idxNum & 4 ){
    pCur->iStep = sqlite3_value_int64(argv[i++]);
    if( pCur->iStep<1 ) pCur->iStep = 1;
  }else{
    pCur->iStep = 1;
  }
  for(i=0; i<argc; i++){
    if( sqlite3_value_type(argv[i])==SQLITE_NULL ){
      /* If any of the constraints have a NULL value, then return no rows.
      ** See ticket https://www.sqlite.org/src/info/fac496b61722daf2 */
      pCur->mnValue = 1;
      pCur->mxValue = 0;
      break;
    }
  }
  if( idxNum & 8 ){
    pCur->isDesc = 1;
    pCur->iValue = pCur->mxValue;
    if( pCur->iStep>0 ){
      pCur->iValue -= (pCur->mxValue - pCur->mnValue)%pCur->iStep;
    }