From: eugene
Date: December 9 2005 10:13pm
Subject: bk commit into 5.0 tree (evgen:1.1994) BUG#15347
List-Archive: http://lists.mysql.com/commits/57
X-Bug: 15347
Message-Id: <20051209221323.68B812C06C@localhost.moonbone.local>

Below is the list of changes that have just been committed into a local
5.0 repository of evgen. When evgen does a push these changes will
be propagated to the main repository and, within 24 hours after the
push, to the public repository.
For information on how to access the public repository
see http://dev.mysql.com/doc/mysql/en/installing-source-tree.html

ChangeSet
  1.1994 05/12/10 01:13:17 evgen@stripped +3 -0
  Fix bug #15347 Wrong result of subselect when records cache and grouping 
  was involved
  
  When subselect is a join with grouping and no records is found, end_send_group
  sets null_row for all tables so grouping functions can correctly calculate their
  values. Normally this null_row cleared for each pass in sub_select(), but
  when flush_cached_records doesn't clear it. This results that values from this
  table always null thus producing wrong result.
  
  flush_cached_records() now clears null_row flag at the very begining.

  mysql-test/r/select.result
    1.115 05/12/10 01:12:26 evgen@stripped +11 -0
    Test case for bug#15347 Wrong result of subselect when records cache and grouping was involved

  mysql-test/t/select.test
    1.94 05/12/10 01:12:11 evgen@stripped +13 -0
    Test case for bug#15347 Wrong result of subselect when records cache and grouping was involved

  sql/sql_select.cc
    1.381 05/12/10 01:11:36 evgen@stripped +1 -0
    Fix bug #15347 Wrong result of subselect when records cache and grouping was involved
    flush_cached_records() now clears null_row flag at the very begining.

# This is a BitKeeper patch.  What follows are the unified diffs for the
# set of deltas contained in the patch.  The rest of the patch, the part
# that BitKeeper cares about, is below these diffs.
# User:	evgen
# Host:	moonbone.local
# Root:	/work/15347-bug-5.0-mysql

--- 1.380/sql/sql_select.cc	2005-12-07 17:01:08 +03:00
+++ 1.381/sql/sql_select.cc	2005-12-10 01:11:36 +03:00
@@ -9853,6 +9853,7 @@
   int error;
   READ_RECORD *info;
 
+  join_tab->table->null_row= 0;
   if (!join_tab->cache.records)
     return NESTED_LOOP_OK;                      /* Nothing to do */
   if (skip_last)

--- 1.114/mysql-test/r/select.result	2005-11-26 05:51:39 +03:00
+++ 1.115/mysql-test/r/select.result	2005-12-10 01:12:26 +03:00
@@ -3337,3 +3337,14 @@
 1	SIMPLE	t2	const	PRIMARY	PRIMARY	4	const	1	Using index
 1	SIMPLE	t3	const	PRIMARY	PRIMARY	8	const,const	1	
 DROP TABLE t1,t2,t3;
+create  table t1 (f1 int);
+insert into t1 values(1),(2);
+create table t2 (f2 int, f3 int, key(f2));
+insert into t2 values(1,1),(2,2);
+create table t3 (f4 int not null);
+insert into t3 values (2),(2),(2);
+select f1,(select count(*) from t2,t3 where f2=f1 and f3=f4) as count from t1;
+f1	count
+1	0
+2	3
+drop table t1,t2,t3;

--- 1.93/mysql-test/t/select.test	2005-11-26 05:51:39 +03:00
+++ 1.94/mysql-test/t/select.test	2005-12-10 01:12:11 +03:00
@@ -2805,3 +2805,16 @@
     WHERE t2.key_a=2 and key_b=5;
 
 DROP TABLE t1,t2,t3;
+
+#
+# Bug#15347 Wrong result of subselect when records cache and grouping 
+#           was involved
+#
+create  table t1 (f1 int);
+insert into t1 values(1),(2);
+create table t2 (f2 int, f3 int, key(f2));
+insert into t2 values(1,1),(2,2);
+create table t3 (f4 int not null);
+insert into t3 values (2),(2),(2);
+select f1,(select count(*) from t2,t3 where f2=f1 and f3=f4) as count from t1;
+drop table t1,t2,t3;