From eaad6119dadcdfeea4f71fab6401a19b648b5fa6 Mon Sep 17 00:00:00 2001
From: "Tatiana A. Nurnberg" <azundris@mysql.com>
Date: Thu, 29 Oct 2009 16:01:54 -0700
Subject: [PATCH] Bug#48295: explain extended crash with subquery and
 ONLY_FULL_GROUP_BY sql_mode

If an outer query is broken, a subquery might not even get set up.
EXPLAIN EXTENDED did not expect this and merrily tried to de-ref all
of the half-setup info.

We now catch this case and print as much as we have, as it doesn't cost us
anything (doesn't make regular execution slower).

mysql-test/r/explain.result:
  Show that EXPLAIN EXTENDED with subquery and illegal out query doesn't crash.
  Show also that SHOW WARNINGS will render an additional Note in the hope of
  being, well, helpful.
mysql-test/t/explain.test:
  If we have only half a query for EXPLAIN EXTENDED to print (i.e.,
  incomplete subquery info as outer query is illegal), we should
  provide the user with as much info as we easily can if they ask
  for it. What we should not do is crash when they come asking for
  help, that violates etiquette in some countries.
sql/item_subselect.cc:
  If the sub-query's actually set up, print it. Otherwise, elide.
---
 mysql-test/r/explain.result | 16 ++++++++++++++++
 mysql-test/t/explain.test   | 20 ++++++++++++++++++++
 sql/item_subselect.cc       | 11 ++++++++---
 3 files changed, 44 insertions(+), 3 deletions(-)

diff --git a/mysql-test/r/explain.result b/mysql-test/r/explain.result
index 96fcbc33d3f..5a1bf1a1290 100644
--- a/mysql-test/r/explain.result
+++ b/mysql-test/r/explain.result
@@ -194,4 +194,20 @@ dt
 2001-01-01 01:01:01
 2001-01-01 01:01:01
 drop tables t1, t2;
+#
+# Bug#48295:
+# explain extended crash with subquery and ONLY_FULL_GROUP_BY sql_mode
+#
+CREATE TABLE t1 (f1 INT);
+SELECT @@session.sql_mode INTO @old_sql_mode;
+SET SESSION sql_mode='ONLY_FULL_GROUP_BY';
+EXPLAIN EXTENDED SELECT 1 FROM t1
+WHERE f1 > ALL( SELECT t.f1 FROM t1,t1 AS t );
+ERROR 42000: Mixing of GROUP columns (MIN(),MAX(),COUNT(),...) with no GROUP columns is illegal if there is no GROUP BY clause
+SHOW WARNINGS;
+Level	Code	Message
+Error	1140	Mixing of GROUP columns (MIN(),MAX(),COUNT(),...) with no GROUP columns is illegal if there is no GROUP BY clause
+Note	1003	select 1 AS `1` from `test`.`t1` where <not>(<exists>(...))
+SET SESSION sql_mode=@old_sql_mode;
+DROP TABLE t1;
 End of 5.1 tests.
diff --git a/mysql-test/t/explain.test b/mysql-test/t/explain.test
index 18f1145a25d..77b49a8b1a5 100644
--- a/mysql-test/t/explain.test
+++ b/mysql-test/t/explain.test
@@ -167,4 +167,24 @@ flush tables;
 SELECT OUTR.dt FROM t1 AS OUTR WHERE OUTR.dt IN ( SELECT INNR.dt FROM t2 AS INNR WHERE OUTR.t < '2005-11-13 7:41:31' );
 drop tables t1, t2;
 
+--echo #
+--echo # Bug#48295:
+--echo # explain extended crash with subquery and ONLY_FULL_GROUP_BY sql_mode
+--echo #
+
+CREATE TABLE t1 (f1 INT);
+
+SELECT @@session.sql_mode INTO @old_sql_mode;
+SET SESSION sql_mode='ONLY_FULL_GROUP_BY';
+
+# EXPLAIN EXTENDED (with subselect). used to crash. should give NOTICE.
+--error ER_MIX_OF_GROUP_FUNC_AND_FIELDS
+EXPLAIN EXTENDED SELECT 1 FROM t1
+                          WHERE f1 > ALL( SELECT t.f1 FROM t1,t1 AS t );
+SHOW WARNINGS;
+
+SET SESSION sql_mode=@old_sql_mode;
+
+DROP TABLE t1;
+
 --echo End of 5.1 tests.
diff --git a/sql/item_subselect.cc b/sql/item_subselect.cc
index da651cec70c..29db9eb0903 100644
--- a/sql/item_subselect.cc
+++ b/sql/item_subselect.cc
@@ -311,9 +311,14 @@ void Item_subselect::update_used_tables()
 
 void Item_subselect::print(String *str, enum_query_type query_type)
 {
-  str->append('(');
-  engine->print(str, query_type);
-  str->append(')');
+  if (engine)
+  {
+    str->append('(');
+    engine->print(str, query_type);
+    str->append(')');
+  }
+  else
+    str->append("(...)");
 }