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Overview
| Comment: | Small performance optimization in the expression walker. |
|---|---|
| Downloads: | Tarball | ZIP archive | SQL archive |
| Timelines: | family | ancestors | descendants | both | trunk |
| Files: | files | file ages | folders |
| SHA1: |
c6e6afb9391704d9119335f2ce17df39 |
| User & Date: | drh 2016-09-19 02:19:00 |
Context
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2016-09-19
| ||
| 10:24 | Improved performance in sqlite3ExprCodeTarget(). check-in: 75146165 user: drh tags: trunk | |
| 02:19 | Small performance optimization in the expression walker. check-in: c6e6afb9 user: drh tags: trunk | |
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2016-09-18
| ||
| 16:08 | Revise the implementation of OP_Once so that it is smaller, faster, and uses less memory. This also fixes an obscure bug introduced 3 days ago by check-in [5990a1bdb4a073]. check-in: 6bf5ba10 user: drh tags: trunk | |
Changes
Changes to src/walker.c.
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testcase( ExprHasProperty(pExpr, EP_Reduced) );
rc = pWalker->xExprCallback(pWalker, pExpr);
if( rc || ExprHasProperty(pExpr,EP_TokenOnly) ) return rc & WRC_Abort;
if( pExpr->pLeft && walkExpr(pWalker, pExpr->pLeft) ) return WRC_Abort;
if( pExpr->pRight && walkExpr(pWalker, pExpr->pRight) ) return WRC_Abort;
if( ExprHasProperty(pExpr, EP_xIsSelect) ){
if( sqlite3WalkSelect(pWalker, pExpr->x.pSelect) ) return WRC_Abort;
}else{
if( sqlite3WalkExprList(pWalker, pExpr->x.pList) ) return WRC_Abort;
}
return WRC_Continue;
}
int sqlite3WalkExpr(Walker *pWalker, Expr *pExpr){
return pExpr ? walkExpr(pWalker,pExpr) : WRC_Continue;
}
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| |
42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 |
testcase( ExprHasProperty(pExpr, EP_Reduced) );
rc = pWalker->xExprCallback(pWalker, pExpr);
if( rc || ExprHasProperty(pExpr,EP_TokenOnly) ) return rc & WRC_Abort;
if( pExpr->pLeft && walkExpr(pWalker, pExpr->pLeft) ) return WRC_Abort;
if( pExpr->pRight && walkExpr(pWalker, pExpr->pRight) ) return WRC_Abort;
if( ExprHasProperty(pExpr, EP_xIsSelect) ){
if( sqlite3WalkSelect(pWalker, pExpr->x.pSelect) ) return WRC_Abort;
}else if( pExpr->x.pList ){
if( sqlite3WalkExprList(pWalker, pExpr->x.pList) ) return WRC_Abort;
}
return WRC_Continue;
}
int sqlite3WalkExpr(Walker *pWalker, Expr *pExpr){
return pExpr ? walkExpr(pWalker,pExpr) : WRC_Continue;
}
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