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Evaluate multiple window functions in a single pass if they use the same

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window definition. Add xValue callbacks for other built-in aggregate
functions.

FossilOrigin-Name: c9f0f140941660ff368e5bb5752d54feb1964b7a9eac986d4bfb8f24a1c20d86
This commit is contained in:
dan
2018-05-17 19:24:08 +00:00
parent 2e362f9775
commit e2f781b9d1
9 changed files with 173 additions and 87 deletions
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16
src/window.c
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@@ -51,3 +51,19 @@ void sqlite3WindowAttach(Parse *pParse, Expr *p, Window *pWin){
sqlite3WindowDelete(pParse->db, pWin);
}
}
/*
** Return 0 if the two window objects are identical, or non-zero otherwise.
*/
int sqlite3WindowCompare(Parse *pParse, Window *p1, Window *p2){
if( p1->eType!=p2->eType ) return 1;
if( p1->eStart!=p2->eStart ) return 1;
if( p1->eEnd!=p2->eEnd ) return 1;
if( sqlite3ExprCompare(pParse, p1->pStart, p2->pStart, -1) ) return 1;
if( sqlite3ExprCompare(pParse, p1->pEnd, p2->pEnd, -1) ) return 1;
if( sqlite3ExprListCompare(p1->pPartition, p2->pPartition, -1) ) return 1;
if( sqlite3ExprListCompare(p1->pOrderBy, p2->pOrderBy, -1) ) return 1;
return 0;
}