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Enhance the automatic index logic so that it creates a partial index when

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doing so gives the same answer for less work.

FossilOrigin-Name: d95d0313c447f5baeabdb17284d8606331ab7d49
This commit is contained in:
drh
2014-10-24 19:28:09 +00:00
parent 4dd96a8315
commit 059b2d50e1
7 changed files with 143 additions and 47 deletions
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4
src/resolve.c
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@@ -28,7 +28,7 @@
** is a helper function - a callback for the tree walker.
*/
static int incrAggDepth(Walker *pWalker, Expr *pExpr){
if( pExpr->op==TK_AGG_FUNCTION ) pExpr->op2 += pWalker->u.i;
if( pExpr->op==TK_AGG_FUNCTION ) pExpr->op2 += pWalker->u.n;
return WRC_Continue;
}
static void incrAggFunctionDepth(Expr *pExpr, int N){
@@ -36,7 +36,7 @@ static void incrAggFunctionDepth(Expr *pExpr, int N){
Walker w;
memset(&w, 0, sizeof(w));
w.xExprCallback = incrAggDepth;
w.u.i = N;
w.u.n = N;
sqlite3WalkExpr(&w, pExpr);
}
}