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Make sure the IS NULL optimization introduced by check-in (3494) correctly

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handles a LEFT JOIN where the a term from the right table of the join uses
an IS NULL constraint.  Ticket #2177.  This check-in also adds the new test
cases that were suppose to have been added with (3494) but which were
mistakenly omitted. (CVS 3595)

FossilOrigin-Name: 335863e4d16113fb9ecebce35d2db043771d98b1
This commit is contained in:
drh
2007-01-19 01:06:01 +00:00
parent cb6c565eab
commit c49de5d98c
5 changed files with 176 additions and 14 deletions
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9
src/sqliteInt.h
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@@ -11,7 +11,7 @@
*************************************************************************
** Internal interface definitions for SQLite.
**
** @(#) $Id: sqliteInt.h,v 1.532 2006/12/21 01:29:23 drh Exp $
** @(#) $Id: sqliteInt.h,v 1.533 2007/01/19 01:06:02 drh Exp $
*/
#ifndef _SQLITEINT_H_
#define _SQLITEINT_H_
@@ -1091,6 +1091,11 @@ typedef unsigned int Bitmask;
** is modified by an INSERT, DELETE, or UPDATE statement. In standard SQL,
** such a table must be a simple name: ID. But in SQLite, the table can
** now be identified by a database name, a dot, then the table name: ID.ID.
**
** The jointype starts out showing the join type between the current table
** and the next table on the list. The parser builds the list this way.
** But sqlite3SrcListShiftJoinType() later shifts the jointypes so that each
** jointype expresses the join between the table and the previous table.
*/
struct SrcList {
i16 nSrc; /* Number of tables or subqueries in the FROM clause */
@@ -1102,7 +1107,7 @@ struct SrcList {
Table *pTab; /* An SQL table corresponding to zName */
Select *pSelect; /* A SELECT statement used in place of a table name */
u8 isPopulated; /* Temporary table associated with SELECT is populated */
u8 jointype; /* Type of join between this table and the next */
u8 jointype; /* Type of join between this able and the previous */
i16 iCursor; /* The VDBE cursor number used to access this table */
Expr *pOn; /* The ON clause of a join */
IdList *pUsing; /* The USING clause of a join */