From 07e0cd2f4ecada460bae12e1b1031f893eb7eb78 Mon Sep 17 00:00:00 2001
From: "igor@olga.mysql.com" <>
Date: Fri, 20 Jul 2007 22:56:19 -0700
Subject: Fixed bug #29911. This bug manifested itself for join queries with
 GROUP BY and HAVING clauses whose SELECT lists contained DISTINCT. It
 occurred when the optimizer could deduce that the result set would have not
 more than one row. The bug could lead to wrong result sets for queries of
 this type because HAVING conditions were erroneously ignored in some cases in
 the function remove_duplicates.

---
 mysql-test/r/having.result | 19 +++++++++++++++++++
 mysql-test/t/having.test   | 26 ++++++++++++++++++++++++++
 sql/sql_select.cc          |  2 +-
 3 files changed, 46 insertions(+), 1 deletion(-)

diff --git a/mysql-test/r/having.result b/mysql-test/r/having.result
index ccd1f0e61e7..7b4340a133b 100644
--- a/mysql-test/r/having.result
+++ b/mysql-test/r/having.result
@@ -158,3 +158,22 @@ EXPLAIN SELECT 0 AS x, a FROM t1 GROUP BY x,a HAVING x=1 AND a > 1;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
 1	SIMPLE	NULL	NULL	NULL	NULL	NULL	NULL	NULL	Impossible HAVING
 DROP table t1;
+CREATE TABLE t1 (a int PRIMARY KEY);
+CREATE TABLE t2 (b int PRIMARY KEY, a int);
+CREATE TABLE t3 (b int, flag int);
+INSERT INTO t1 VALUES (1);
+INSERT INTO t2 VALUES (1,1), (2,1), (3,1);
+INSERT INTO t3(b,flag) VALUES (2, 1);
+SELECT t1.a
+FROM t1 INNER JOIN t2 ON t1.a=t2.a LEFT JOIN t3 ON t2.b=t3.b
+GROUP BY t1.a, t2.b HAVING MAX(t3.flag)=0;
+a
+SELECT DISTINCT t1.a, MAX(t3.flag)
+FROM t1 INNER JOIN t2 ON t1.a=t2.a LEFT JOIN t3 ON t2.b=t3.b
+GROUP BY t1.a, t2.b HAVING MAX(t3.flag)=0;
+a	MAX(t3.flag)
+SELECT DISTINCT t1.a
+FROM t1 INNER JOIN t2 ON t1.a=t2.a LEFT JOIN t3 ON t2.b=t3.b
+GROUP BY t1.a, t2.b HAVING MAX(t3.flag)=0;
+a
+DROP TABLE t1,t2,t3;
diff --git a/mysql-test/t/having.test b/mysql-test/t/having.test
index 8b39e3bd454..c0ce3cbace7 100644
--- a/mysql-test/t/having.test
+++ b/mysql-test/t/having.test
@@ -151,4 +151,30 @@ EXPLAIN SELECT 0 AS x, a FROM t1 GROUP BY x,a HAVING x=1 AND a > 1;
 
 DROP table t1;  
 
+#
+# Bug #29911: HAVING clause depending on constant table and evaluated to false
+#
+
+CREATE TABLE t1 (a int PRIMARY KEY);
+CREATE TABLE t2 (b int PRIMARY KEY, a int);
+CREATE TABLE t3 (b int, flag int);
+
+INSERT INTO t1 VALUES (1);
+INSERT INTO t2 VALUES (1,1), (2,1), (3,1);
+INSERT INTO t3(b,flag) VALUES (2, 1);
+
+SELECT t1.a
+  FROM t1 INNER JOIN t2 ON t1.a=t2.a LEFT JOIN t3 ON t2.b=t3.b
+    GROUP BY t1.a, t2.b HAVING MAX(t3.flag)=0;
+
+SELECT DISTINCT t1.a, MAX(t3.flag)
+  FROM t1 INNER JOIN t2 ON t1.a=t2.a LEFT JOIN t3 ON t2.b=t3.b
+    GROUP BY t1.a, t2.b HAVING MAX(t3.flag)=0;
+
+SELECT DISTINCT t1.a
+  FROM t1 INNER JOIN t2 ON t1.a=t2.a LEFT JOIN t3 ON t2.b=t3.b
+    GROUP BY t1.a, t2.b HAVING MAX(t3.flag)=0;
+
+DROP TABLE t1,t2,t3;
+
 # End of 4.1 tests
diff --git a/sql/sql_select.cc b/sql/sql_select.cc
index 8b5664a7f96..afbffc499ad 100644
--- a/sql/sql_select.cc
+++ b/sql/sql_select.cc
@@ -8118,7 +8118,7 @@ remove_duplicates(JOIN *join, TABLE *entry,List<Item> &fields, Item *having)
       field_count++;
   }
 
-  if (!field_count && !(join->select_options & OPTION_FOUND_ROWS)) 
+  if (!field_count && !(join->select_options & OPTION_FOUND_ROWS) && !having) 
   {                    // only const items with no OPTION_FOUND_ROWS
     join->unit->select_limit_cnt= 1;		// Only send first row
     DBUG_RETURN(0);
-- 
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