SQLite: Check-in [e1f893c6]

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Overview

Comment:	Unintentional edits mistakenly checked in. Was: Remove an obsolete and incorrect comment from the whereLoopOutputAdjust() routine in the query planner. No changes to working code.
Downloads:	Tarball \| ZIP archive \| SQL archive
Timelines:	family \| ancestors \| mistake
Files:	files \| file ages \| folders
SHA1:	e1f893c60636813495ad919ed31b6a7452cdcd0f
User & Date:	drh 2014-11-22 16:14:32
Original Comment:	Remove an obsolete and incorrect comment from the whereLoopOutputAdjust() routine in the query planner. No changes to working code.

Context

2014-11-22
16:14		Unintentional edits mistakenly checked in. Was: Remove an obsolete and incorrect comment from the whereLoopOutputAdjust() routine in the query planner. No changes to working code. Closed-Leaf check-in: e1f893c6 user: drh tags: mistake
12:22		Remove a redundant test case (probably a copy/paste error). Add an assert() to where.c to ensure that automatic indexes do not have there output row counts adjusted downward by supplementary constraints. check-in: eea47933 user: drh tags: trunk

Changes

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Changes to src/where.c.

  char aff;
  if( pTerm->leftCursor!=pSrc->iCursor ) return 0;
  if( (pTerm->eOperator & WO_EQ)==0 ) return 0;
  if( (pTerm->prereqRight & notReady)!=0 ) return 0;
  if( pTerm->u.leftColumn<0 ) return 0;
  aff = pSrc->pTab->aCol[pTerm->u.leftColumn].affinity;
  if( !sqlite3IndexAffinityOk(pTerm->pExpr, aff) ) return 0;

  return 1;
}
#endif


#ifndef SQLITE_OMIT_AUTOMATIC_INDEX
/*
................................................................................
  return SQLITE_OK;
}

/*
** Adjust the WhereLoop.nOut value downward to account for terms of the
** WHERE clause that reference the loop but which are not used by an
** index.
**
** In the current implementation, the first extra WHERE clause term reduces
** the number of output rows by a factor of 10 and each additional term
** reduces the number of output rows by sqrt(2).
*/
static void whereLoopOutputAdjust(
  WhereClause *pWC,      /* The WHERE clause */
  WhereLoop *pLoop,      /* The loop to adjust downward */
  LogEst nRow            /* Number of rows in the entire table */
){
  WhereTerm *pTerm, *pX;

  char aff;
  if( pTerm->leftCursor!=pSrc->iCursor ) return 0;
  if( (pTerm->eOperator & WO_EQ)==0 ) return 0;
  if( (pTerm->prereqRight & notReady)!=0 ) return 0;
  if( pTerm->u.leftColumn<0 ) return 0;
  aff = pSrc->pTab->aCol[pTerm->u.leftColumn].affinity;
  if( !sqlite3IndexAffinityOk(pTerm->pExpr, aff) ) return 0;
  if( sqlite3ExprIsConstant(pTerm->pExpr->pRight) ) return 0;
  return 1;
}
#endif


#ifndef SQLITE_OMIT_AUTOMATIC_INDEX
/*
................................................................................
  return SQLITE_OK;
}

/*
** Adjust the WhereLoop.nOut value downward to account for terms of the
** WHERE clause that reference the loop but which are not used by an
** index.




*/
static void whereLoopOutputAdjust(
  WhereClause *pWC,      /* The WHERE clause */
  WhereLoop *pLoop,      /* The loop to adjust downward */
  LogEst nRow            /* Number of rows in the entire table */
){
  WhereTerm *pTerm, *pX;