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An optimization: avoid the use of an intermediate table on UNION ALL if there

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is no ORDER BY clause. (CVS 637)

FossilOrigin-Name: 8aa73ce61268a50d353d9a5c878461290195525f
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drh
2002-06-22 02:33:38 +00:00
parent d11d382c99
commit f46f905a1e
6 changed files with 64 additions and 31 deletions
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3
src/sqliteInt.h
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@@ -11,7 +11,7 @@
*************************************************************************
** Internal interface definitions for SQLite.
**
** @(#) $Id: sqliteInt.h,v 1.128 2002/06/21 23:01:50 drh Exp $
** @(#) $Id: sqliteInt.h,v 1.129 2002/06/22 02:33:39 drh Exp $
*/
#include "sqlite.h"
#include "hash.h"
@@ -603,6 +603,7 @@ struct Select {
#define SRT_Table 7 /* Store result as data with a unique key */
#define SRT_TempTable 8 /* Store result in a trasient table */
#define SRT_Discard 9 /* Do not save the results anywhere */
#define SRT_Sorter 10 /* Store results in the sorter */
/*
** When a SELECT uses aggregate functions (like "count(*)" or "avg(f1)")