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First cut at optimizing single-row updates to use a one-pass algorithm. (CVS 4973)

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FossilOrigin-Name: fba97f7874d723111e873d1470fc1a95e64f922d
This commit is contained in:
drh
2008-04-10 13:33:18 +00:00
parent 67ade0a2d0
commit 08c88eb0d3
7 changed files with 68 additions and 40 deletions
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15
src/sqliteInt.h
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@@ -11,7 +11,7 @@
*************************************************************************
** Internal interface definitions for SQLite.
**
** @(#) $Id: sqliteInt.h,v 1.689 2008/04/05 18:41:43 drh Exp $
** @(#) $Id: sqliteInt.h,v 1.690 2008/04/10 13:33:18 drh Exp $
*/
#ifndef _SQLITEINT_H_
#define _SQLITEINT_H_
@@ -1311,9 +1311,13 @@ struct WhereLevel {
sqlite3_index_info *pIdxInfo; /* Index info for n-th source table */
};
#define ORDERBY_NORMAL 0
#define ORDERBY_MIN 1
#define ORDERBY_MAX 2
/*
** Flags appropriate for the wflags parameter of sqlite3WhereBegin().
*/
#define WHERE_ORDERBY_NORMAL 0 /* No-op */
#define WHERE_ORDERBY_MIN 1 /* ORDER BY processing for min() func */
#define WHERE_ORDERBY_MAX 2 /* ORDER BY processing for max() func */
#define WHERE_ONEPASS_DESIRED 4 /* Want to do one-pass UPDATE/DELETE */
/*
** The WHERE clause processing routine has two halves. The
@@ -1323,7 +1327,8 @@ struct WhereLevel {
** into the second half to give some continuity.
*/
struct WhereInfo {
Parse *pParse;
Parse *pParse; /* Parsing and code generating context */
u8 okOnePass; /* Ok to use one-pass algorithm for UPDATE or DELETE */
SrcList *pTabList; /* List of tables in the join */
int iTop; /* The very beginning of the WHERE loop */
int iContinue; /* Jump here to continue with next record */