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Overview
| Comment: | Optimization to sqlite3WhereExprUsage(). |
|---|---|
| Downloads: | Tarball | ZIP archive | SQL archive |
| Timelines: | family | ancestors | descendants | both | trunk |
| Files: | files | file ages | folders |
| SHA1: |
95493058fcf40306727a281f21c5a2a0 |
| User & Date: | drh 2016-08-10 20:02:21 |
Context
|
2016-08-11
| ||
| 01:24 | Fix a harmless compiler warning in FTS5. (check-in: 2ea0c8b4 user: drh tags: trunk) | |
|
2016-08-10
| ||
| 20:02 | Optimization to sqlite3WhereExprUsage(). (check-in: 95493058 user: drh tags: trunk) | |
| 19:43 | List of MATCH operator names in isMatchOfColumn() should be constant. (check-in: 7319d676 user: drh tags: trunk) | |
Changes
Changes to src/whereexpr.c.
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/*
** These routines walk (recursively) an expression tree and generate
** a bitmask indicating which tables are used in that expression
** tree.
*/
Bitmask sqlite3WhereExprUsage(WhereMaskSet *pMaskSet, Expr *p){
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;
|
| > | |
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/*
** These routines walk (recursively) an expression tree and generate
** a bitmask indicating which tables are used in that expression
** tree.
*/
Bitmask sqlite3WhereExprUsage(WhereMaskSet *pMaskSet, Expr *p){
Bitmask mask;
if( p==0 ) return 0;
if( p->op==TK_COLUMN ){
mask = sqlite3WhereGetMask(pMaskSet, p->iTable);
return mask;
}
assert( !ExprHasProperty(p, EP_TokenOnly) );
mask = p->pRight ? sqlite3WhereExprUsage(pMaskSet, p->pRight) : 0;
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;
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