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Overview
| Comment: | Performance improvement: Avoid using sqlite3WalkerSelectExpr() and sqlite3WalkerSelectFrom() twice, so that the compiler will in-line their implementation. |
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| Downloads: | Tarball | ZIP archive | SQL archive |
| Timelines: | family | ancestors | descendants | both | ticket-f09fcd17810f |
| Files: | files | file ages | folders |
| SHA3-256: | 2b9258b8b0342330ebe8c22b59ec276f |
| User & Date: | drh 2018-12-06 22:12:18 |
Context
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2018-12-07
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| 01:56 | Fix the sqlite3ExprDup() function so that it correctly duplicates the Window object list on a Select that contains window functions. Fix for ticket [f09fcd17810f65f717]. check-in: db5ed226 user: drh tags: trunk | |
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2018-12-06
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| 22:12 | Performance improvement: Avoid using sqlite3WalkerSelectExpr() and sqlite3WalkerSelectFrom() twice, so that the compiler will in-line their implementation. Closed-Leaf check-in: 2b9258b8 user: drh tags: ticket-f09fcd17810f | |
| 22:04 | Fix the sqlite3ExprDup() routine so that it makes complete duplications of subqueries containing window functions. check-in: 94017454 user: drh tags: ticket-f09fcd17810f | |
Changes
Changes to src/expr.c.
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if( pExpr->op==TK_FUNCTION && pExpr->y.pWin!=0 ){
assert( ExprHasProperty(pExpr, EP_WinFunc) );
pExpr->y.pWin->pNextWin = pWalker->u.pSelect->pWin;
pWalker->u.pSelect->pWin = pExpr->y.pWin;
}
return WRC_Continue;
}
static void gatherSelectWindows(Select *p){
Walker w;
w.xExprCallback = gatherSelectWindowsCallback;
w.xSelectCallback = 0;
w.u.pSelect = p;
sqlite3WalkSelectExpr(&w, p);
sqlite3WalkSelectFrom(&w, p);
}
#endif
/*
** The following group of routines make deep copies of expressions,
** expression lists, ID lists, and select statements. The copies can
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> > > > | | < |
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if( pExpr->op==TK_FUNCTION && pExpr->y.pWin!=0 ){
assert( ExprHasProperty(pExpr, EP_WinFunc) );
pExpr->y.pWin->pNextWin = pWalker->u.pSelect->pWin;
pWalker->u.pSelect->pWin = pExpr->y.pWin;
}
return WRC_Continue;
}
static int gatherSelectWindowsSelectCallback(Walker *pWalker, Select *p){
return p==pWalker->u.pSelect ? WRC_Continue : WRC_Prune;
}
static void gatherSelectWindows(Select *p){
Walker w;
w.xExprCallback = gatherSelectWindowsCallback;
w.xSelectCallback = gatherSelectWindowsSelectCallback;
w.xSelectCallback2 = 0;
w.u.pSelect = p;
sqlite3WalkSelect(&w, p);
}
#endif
/*
** The following group of routines make deep copies of expressions,
** expression lists, ID lists, and select statements. The copies can
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