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The optimizer now uses only the index and ignores the table if it can get

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away with doing so, thus saving a single BTree search per row of result.
This could potentially double the speed of certain queries.  The
code passes all regression tests but new tests to exercise the new
functionality are yet to be added. (CVS 2170)

FossilOrigin-Name: e5aa489453bf31126da6473ef93c89ec27935cde
This commit is contained in:
drh
2004-12-19 00:11:35 +00:00
parent 51669863a8
commit 9012bcbc0a
7 changed files with 255 additions and 258 deletions
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10
src/sqliteInt.h
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@@ -11,7 +11,7 @@
*************************************************************************
** Internal interface definitions for SQLite.
**
** @(#) $Id: sqliteInt.h,v 1.347 2004/12/18 18:40:27 drh Exp $
** @(#) $Id: sqliteInt.h,v 1.348 2004/12/19 00:11:35 drh Exp $
*/
#ifndef _SQLITEINT_H_
#define _SQLITEINT_H_
@@ -309,6 +309,7 @@ typedef struct CollSeq CollSeq;
typedef struct KeyInfo KeyInfo;
typedef struct SqlCursor SqlCursor;
typedef struct Fetch Fetch;
typedef struct CursorSubst CursorSubst;
/*
** Each database file to be accessed by the system is an instance
@@ -910,8 +911,9 @@ struct SrcList {
*/
struct WhereLevel {
int iMem; /* Memory cell used by this level */
Index *pIdx; /* Index used */
int iCur; /* Cursor number used for this index */
Index *pIdx; /* Index used. NULL if no index */
int iTabCur; /* The VDBE cursor used to access the table */
int iIdxCur; /* The VDBE cursor used to acesss pIdx */
int score; /* How well this indexed scored */
int brk; /* Jump here to break out of the loop */
int cont; /* Jump here to continue with the next loop cycle */
@@ -932,6 +934,7 @@ struct WhereLevel {
struct WhereInfo {
Parse *pParse;
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 */
int iBreak; /* Jump here to break out of the loop */
int nLevel; /* Number of nested loop */
@@ -1067,7 +1070,6 @@ struct Parse {
Trigger *pNewTrigger; /* Trigger under construct by a CREATE TRIGGER */
TriggerStack *trigStack; /* Trigger actions being coded */
const char *zAuthContext; /* The 6th parameter to db->xAuth callbacks */
};
/*