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Overview
| Comment: | Performance improvements in sqlite3WhereExprUsage(). |
|---|---|
| Downloads: | Tarball | ZIP archive | SQL archive |
| Timelines: | family | ancestors | descendants | both | trunk |
| Files: | files | file ages | folders |
| SHA1: |
fdf752394b48fb7b9afe7b8a7d83f859 |
| User & Date: | drh 2016-04-12 00:00:33 |
Context
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2016-04-12
| ||
| 00:16 | Avoid unnecessary calls to object destructors for a small performance gain. check-in: aec94b6e user: drh tags: trunk | |
| 00:00 | Performance improvements in sqlite3WhereExprUsage(). check-in: fdf75239 user: drh tags: trunk | |
|
2016-04-11
| ||
| 22:23 | Fix typo in the MSVC makefile. check-in: 3189a7f1 user: mistachkin tags: trunk | |
Changes
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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