database/sqlite
1
0
Fork 0
mirror of https://github.com/sqlite/sqlite.git synced 2025-11-14 00:22:38 +03:00
Code Activity

Added the %fallback directive to the lemon parser generator and used this

Browse Source 
in the parser to make the parse tables much smaller.  This reduced the size
of the library by 15K. (CVS 605)

FossilOrigin-Name: 7ac5bd293cbb2bf252f31f1571f7efac7e77280a
This commit is contained in:
drh
2002-06-06 18:54:39 +00:00
parent bd790ee395
commit 0bd1f4ea5a
8 changed files with 227 additions and 77 deletions
Download Patch File Download Diff File Expand all files Collapse all files

16
src/select.c
View File

@@ -12,7 +12,7 @@
** This file contains C code routines that are called by the parser
** to handle SELECT statements in SQLite.
**
** $Id: select.c,v 1.90 2002/06/02 16:09:02 drh Exp $
** $Id: select.c,v 1.91 2002/06/06 18:54:40 drh Exp $
*/
#include "sqliteInt.h"
@@ -326,12 +326,9 @@ static int selectInnerLoop(
** part of the result.
*/
if( distinct>=0 && pEList && pEList->nExpr>0 ){
/* For the purposes of the DISTINCT keyword to a SELECT, NULLs
** are indistinct. This was confirmed by experiment in Oracle
** and PostgreSQL. It seems contradictory, but it appears to be
** true.
** sqliteVdbeAddOp(v, OP_IsNull, -pEList->nExpr,sqliteVdbeCurrentAddr(v)+7);
*/
#if NULL_ALWAYS_DISTINCT
sqliteVdbeAddOp(v, OP_IsNull, -pEList->nExpr, sqliteVdbeCurrentAddr(v)+7);
#endif
sqliteVdbeAddOp(v, OP_MakeKey, pEList->nExpr, 1);
sqliteVdbeAddOp(v, OP_Distinct, distinct, sqliteVdbeCurrentAddr(v)+3);
sqliteVdbeAddOp(v, OP_Pop, pEList->nExpr+1, 0);
@@ -363,7 +360,7 @@ static int selectInnerLoop(
** table iParm.
*/
if( eDest==SRT_Union ){
sqliteVdbeAddOp(v, OP_MakeRecord, nColumn, 0);
sqliteVdbeAddOp(v, OP_MakeRecord, nColumn, NULL_ALWAYS_DISTINCT);
sqliteVdbeAddOp(v, OP_String, 0, 0);
sqliteVdbeAddOp(v, OP_PutStrKey, iParm, 0);
}else
@@ -382,7 +379,8 @@ static int selectInnerLoop(
** the temporary table iParm.
*/
if( eDest==SRT_Except ){
int addr = sqliteVdbeAddOp(v, OP_MakeRecord, nColumn, 0);
int addr;
addr = sqliteVdbeAddOp(v, OP_MakeRecord, nColumn, NULL_ALWAYS_DISTINCT);
sqliteVdbeAddOp(v, OP_NotFound, iParm, addr+3);
sqliteVdbeAddOp(v, OP_Delete, iParm, 0);
}else