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Overview
Comment:Performance improvements in sqlite3WhereExprUsage().
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SHA1: fdf752394b48fb7b9afe7b8a7d83f859985cc2d2
User & Date: drh 2016-04-12 00:00:33.150
Context
2016-04-12
00:16
Avoid unnecessary calls to object destructors for a small performance gain. (check-in: aec94b6ee6 user: drh tags: trunk)
00:00
Performance improvements in sqlite3WhereExprUsage(). (check-in: fdf752394b user: drh tags: trunk)
2016-04-11
22:23
Fix typo in the MSVC makefile. (check-in: 3189a7f185 user: mistachkin tags: trunk)
Changes
Unified Diff Ignore Whitespace Patch
Changes to src/whereexpr.c.
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  Bitmask mask = 0;
  if( p==0 ) return 0;
  if( p->op==TK_COLUMN ){
    mask = sqlite3WhereGetMask(pMaskSet, p->iTable);
    return mask;
  }
  mask = sqlite3WhereExprUsage(pMaskSet, p->pRight);
  mask |= sqlite3WhereExprUsage(pMaskSet, p->pLeft);
  if( ExprHasProperty(p, EP_xIsSelect) ){
    mask |= exprSelectUsage(pMaskSet, p->x.pSelect);
  }else{
    mask |= sqlite3WhereExprListUsage(pMaskSet, p->x.pList);
  }
  return mask;
}
Bitmask sqlite3WhereExprListUsage(WhereMaskSet *pMaskSet, ExprList *pList){
  int i;
  Bitmask mask = 0;








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  Bitmask mask = 0;
  if( p==0 ) return 0;
  if( p->op==TK_COLUMN ){
    mask = sqlite3WhereGetMask(pMaskSet, p->iTable);
    return mask;
  }
  mask = sqlite3WhereExprUsage(pMaskSet, p->pRight);
  if( p->pLeft ) mask |= sqlite3WhereExprUsage(pMaskSet, p->pLeft);
  if( ExprHasProperty(p, EP_xIsSelect) ){
    mask |= exprSelectUsage(pMaskSet, p->x.pSelect);
  }else if( p->x.pList ){
    mask |= sqlite3WhereExprListUsage(pMaskSet, p->x.pList);
  }
  return mask;
}
Bitmask sqlite3WhereExprListUsage(WhereMaskSet *pMaskSet, ExprList *pList){
  int i;
  Bitmask mask = 0;
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