database/sqlite
1
0
Fork 0
mirror of https://github.com/sqlite/sqlite.git synced 2025-11-06 15:49:35 +03:00
Code Activity

Avoid duplicate OP_Column opcodes by remembering prior results.

Browse Source 
This is similar to CSE, but only applies to columns. (CVS 4943)

FossilOrigin-Name: c29ee0fed23dcdbd9dde6b1e42b603100ea2389c
This commit is contained in:
drh
2008-03-31 23:48:03 +00:00
parent 678ccce8b3
commit e55cbd7228
9 changed files with 209 additions and 47 deletions
Download Patch File Download Diff File Expand all files Collapse all files

16
src/sqliteInt.h
View File

@@ -11,7 +11,7 @@
*************************************************************************
** Internal interface definitions for SQLite.
**
** @(#) $Id: sqliteInt.h,v 1.682 2008/03/31 18:19:54 drh Exp $
** @(#) $Id: sqliteInt.h,v 1.683 2008/03/31 23:48:05 drh Exp $
*/
#ifndef _SQLITEINT_H_
#define _SQLITEINT_H_
@@ -1463,6 +1463,14 @@ struct Parse {
int nMem; /* Number of memory cells used so far */
int nSet; /* Number of sets used so far */
int ckBase; /* Base register of data during check constraints */
int disableColCache; /* True to disable adding to column cache */
int nColCache; /* Number of entries in the column cache */
int iColCache; /* Next entry of the cache to replace */
struct {
int iTable; /* Table cursor number */
int iColumn; /* Table column number */
int iReg; /* Register holding value of this column */
} aColCache[10]; /* One for each valid column cache entry */
u32 writeMask; /* Start a write transaction on these databases */
u32 cookieMask; /* Bitmask of schema verified databases */
int cookieGoto; /* Address of OP_Goto to cookie verifier subroutine */
@@ -1829,7 +1837,11 @@ void sqlite3DeleteFrom(Parse*, SrcList*, Expr*);
void sqlite3Update(Parse*, SrcList*, ExprList*, Expr*, int);
WhereInfo *sqlite3WhereBegin(Parse*, SrcList*, Expr*, ExprList**, u8);
void sqlite3WhereEnd(WhereInfo*);
void sqlite3ExprCodeGetColumn(Vdbe*, Table*, int, int, int);
int sqlite3ExprCodeGetColumn(Parse*, Table*, int, int, int);
void sqlite3ExprCodeMove(Parse*, int, int);
void sqlite3ExprClearColumnCache(Parse*, int);
void sqlite3ExprColumnCacheDisable(Parse*, int);
void sqlite3ExprExpireColumnCacheLines(Parse*, int, int);
int sqlite3ExprCode(Parse*, Expr*, int);
int sqlite3ExprCodeTemp(Parse*, Expr*, int*);
int sqlite3ExprCodeTarget(Parse*, Expr*, int);