database/sqlite
1
0
Fork 0
mirror of https://github.com/sqlite/sqlite.git synced 2025-11-08 03:22:21 +03:00
Code Activity

VDBE cursors numbers for tables in a join do not have to be consecutive.

Browse Source 
This is one step on the road to fixing ticket #272. (CVS 947)

FossilOrigin-Name: be7aed2011b4af868b6a0c370c3d41354ae0cdf4
This commit is contained in:
drh
2003-05-02 14:32:12 +00:00
parent 56e452cf3a
commit 6a3ea0e6ef
15 changed files with 315 additions and 322 deletions
Download Patch File Download Diff File Expand all files Collapse all files

31
src/expr.c
View File

@@ -12,7 +12,7 @@
** This file contains routines used for analyzing expressions and
** for generating VDBE code that evaluates expressions in SQLite.
**
** $Id: expr.c,v 1.94 2003/04/22 20:30:39 drh Exp $
** $Id: expr.c,v 1.95 2003/05/02 14:32:13 drh Exp $
*/
#include "sqliteInt.h"
#include <ctype.h>
@@ -194,6 +194,7 @@ SrcList *sqliteSrcListDup(SrcList *p){
pNew->a[i].zName = sqliteStrDup(p->a[i].zName);
pNew->a[i].zAlias = sqliteStrDup(p->a[i].zAlias);
pNew->a[i].jointype = p->a[i].jointype;
pNew->a[i].iCursor = p->a[i].iCursor;
pNew->a[i].pTab = 0;
pNew->a[i].pSelect = sqliteSelectDup(p->a[i].pSelect);
pNew->a[i].pOn = sqliteExprDup(p->a[i].pOn);
@@ -402,13 +403,16 @@ int sqliteIsRowid(const char *z){
*/
int sqliteExprResolveIds(
Parse *pParse, /* The parser context */
int base, /* VDBE cursor number for first entry in pTabList */
SrcList *pTabList, /* List of tables used to resolve column names */
ExprList *pEList, /* List of expressions used to resolve "AS" */
Expr *pExpr /* The expression to be analyzed. */
){
int i;
if( pExpr==0 || pTabList==0 ) return 0;
assert( base+pTabList->nSrc<=pParse->nTab );
for(i=0; i<pTabList->nSrc; i++){
assert( pTabList->a[i].iCursor>=0 && pTabList->a[i].iCursor<pParse->nTab );
}
switch( pExpr->op ){
/* Double-quoted strings (ex: "abc") are used as identifiers if
** possible. Otherwise they remain as strings. Single-quoted
@@ -430,7 +434,6 @@ int sqliteExprResolveIds(
*/
case TK_ID: {
int cnt = 0; /* Number of matches */
int i; /* Loop counter */
char *z;
int iDb = -1;
@@ -447,7 +450,7 @@ int sqliteExprResolveIds(
for(j=0; j<pTab->nCol; j++){
if( sqliteStrICmp(pTab->aCol[j].zName, z)==0 ){
cnt++;
pExpr->iTable = i + base;
pExpr->iTable = pTabList->a[i].iCursor;
pExpr->iDb = pTab->iDb;
if( j==pTab->iPKey ){
/* Substitute the record number for the INTEGER PRIMARY KEY */
@@ -476,7 +479,7 @@ int sqliteExprResolveIds(
}
if( cnt==0 && iDb>=0 && sqliteIsRowid(z) ){
pExpr->iColumn = -1;
pExpr->iTable = base;
pExpr->iTable = pTabList->a[0].iCursor;
pExpr->iDb = iDb;
cnt = 1 + (pTabList->nSrc>1);
pExpr->op = TK_COLUMN;
@@ -491,7 +494,7 @@ int sqliteExprResolveIds(
return 1;
}
if( pExpr->op==TK_COLUMN ){
sqliteAuthRead(pParse, pExpr, pTabList, base);
sqliteAuthRead(pParse, pExpr, pTabList);
}
break;
}
@@ -550,13 +553,13 @@ int sqliteExprResolveIds(
}
}
if( 0==(cntTab++) ){
pExpr->iTable = i + base;
pExpr->iTable = pTabList->a[i].iCursor;
pExpr->iDb = pTab->iDb;
}
for(j=0; j<pTab->nCol; j++){
if( sqliteStrICmp(pTab->aCol[j].zName, zRight)==0 ){
cnt++;
pExpr->iTable = i + base;
pExpr->iTable = pTabList->a[i].iCursor;
pExpr->iDb = pTab->iDb;
/* Substitute the rowid (column -1) for the INTEGER PRIMARY KEY */
pExpr->iColumn = j==pTab->iPKey ? -1 : j;
@@ -620,14 +623,14 @@ int sqliteExprResolveIds(
sqliteExprDelete(pExpr->pRight);
pExpr->pRight = 0;
pExpr->op = TK_COLUMN;
sqliteAuthRead(pParse, pExpr, pTabList, base);
sqliteAuthRead(pParse, pExpr, pTabList);
break;
}
case TK_IN: {
Vdbe *v = sqliteGetVdbe(pParse);
if( v==0 ) return 1;
if( sqliteExprResolveIds(pParse, base, pTabList, pEList, pExpr->pLeft) ){
if( sqliteExprResolveIds(pParse, pTabList, pEList, pExpr->pLeft) ){
return 1;
}
if( pExpr->pSelect ){
@@ -697,11 +700,11 @@ int sqliteExprResolveIds(
/* For all else, just recursively walk the tree */
default: {
if( pExpr->pLeft
&& sqliteExprResolveIds(pParse, base, pTabList, pEList, pExpr->pLeft) ){
&& sqliteExprResolveIds(pParse, pTabList, pEList, pExpr->pLeft) ){
return 1;
}
if( pExpr->pRight
&& sqliteExprResolveIds(pParse, base, pTabList, pEList, pExpr->pRight) ){
&& sqliteExprResolveIds(pParse, pTabList, pEList, pExpr->pRight) ){
return 1;
}
if( pExpr->pList ){
@@ -709,7 +712,7 @@ int sqliteExprResolveIds(
ExprList *pList = pExpr->pList;
for(i=0; i<pList->nExpr; i++){
Expr *pArg = pList->a[i].pExpr;
if( sqliteExprResolveIds(pParse, base, pTabList, pEList, pArg) ){
if( sqliteExprResolveIds(pParse, pTabList, pEList, pArg) ){
return 1;
}
}