From d2cfad167b15ba3276c7855bfcc4950a706b0f3d Mon Sep 17 00:00:00 2001
From: "igor@rurik.mysql.com" <>
Date: Fri, 6 Jan 2006 22:28:26 -0800
Subject: [PATCH] Fixed bug #16016: MIN/MAX optimization was not applied to
 views.

---
 mysql-test/r/view.result | 29 +++++++++++++++++++++++++++++
 mysql-test/t/view.test   | 24 ++++++++++++++++++++++++
 sql/opt_sum.cc           | 10 +++++-----
 3 files changed, 58 insertions(+), 5 deletions(-)

diff --git a/mysql-test/r/view.result b/mysql-test/r/view.result
index b9380dcf033..8b6d0787ada 100644
--- a/mysql-test/r/view.result
+++ b/mysql-test/r/view.result
@@ -2475,3 +2475,32 @@ alias1	alias2
 5	5
 drop view v2, v1;
 drop table t1;
+CREATE TABLE t1 (a int PRIMARY KEY, b int);
+INSERT INTO t1 VALUES (2,20), (3,10), (1,10), (0,30), (5,10);
+CREATE VIEW v1 AS SELECT * FROM t1;
+SELECT MAX(a) FROM t1;
+MAX(a)
+5
+SELECT MAX(a) FROM v1;
+MAX(a)
+5
+EXPLAIN SELECT MAX(a) FROM t1;
+id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
+1	SIMPLE	NULL	NULL	NULL	NULL	NULL	NULL	NULL	Select tables optimized away
+EXPLAIN SELECT MAX(a) FROM v1;
+id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
+1	PRIMARY	NULL	NULL	NULL	NULL	NULL	NULL	NULL	Select tables optimized away
+SELECT MIN(a) FROM t1;
+MIN(a)
+0
+SELECT MIN(a) FROM v1;
+MIN(a)
+0
+EXPLAIN SELECT MIN(a) FROM t1;
+id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
+1	SIMPLE	NULL	NULL	NULL	NULL	NULL	NULL	NULL	Select tables optimized away
+EXPLAIN SELECT MIN(a) FROM v1;
+id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
+1	PRIMARY	NULL	NULL	NULL	NULL	NULL	NULL	NULL	Select tables optimized away
+DROP VIEW v1;
+DROP TABLE t1;
diff --git a/mysql-test/t/view.test b/mysql-test/t/view.test
index db6c12fdacb..5f3678215f2 100644
--- a/mysql-test/t/view.test
+++ b/mysql-test/t/view.test
@@ -2339,3 +2339,27 @@ order by v2.receipt_id;
 
 drop view v2, v1;
 drop table t1;
+
+#
+# Bug#16016: MIN/MAX optimization for views
+#
+
+CREATE TABLE t1 (a int PRIMARY KEY, b int);
+INSERT INTO t1 VALUES (2,20), (3,10), (1,10), (0,30), (5,10);
+
+CREATE VIEW v1 AS SELECT * FROM t1;
+
+SELECT MAX(a) FROM t1;
+SELECT MAX(a) FROM v1;
+
+EXPLAIN SELECT MAX(a) FROM t1;
+EXPLAIN SELECT MAX(a) FROM v1;
+
+SELECT MIN(a) FROM t1;
+SELECT MIN(a) FROM v1;
+
+EXPLAIN SELECT MIN(a) FROM t1;
+EXPLAIN SELECT MIN(a) FROM v1;
+
+DROP VIEW v1;
+DROP TABLE t1;
diff --git a/sql/opt_sum.cc b/sql/opt_sum.cc
index 37acce2934b..ed8e694dcb7 100644
--- a/sql/opt_sum.cc
+++ b/sql/opt_sum.cc
@@ -180,14 +180,14 @@ int opt_sum_query(TABLE_LIST *tables, List<Item> &all_fields,COND *conds)
           indexes to find the key.
         */
         Item *expr=item_sum->args[0];
-        if (expr->type() == Item::FIELD_ITEM)
+        if (expr->real_item()->type() == Item::FIELD_ITEM)
         {
           byte key_buff[MAX_KEY_LENGTH];
           TABLE_REF ref;
           uint range_fl, prefix_len;
 
           ref.key_buff= key_buff;
-          Item_field *item_field= ((Item_field*) expr);
+          Item_field *item_field= (Item_field*) (expr->real_item());
           TABLE *table= item_field->field->table;
 
           /* 
@@ -267,14 +267,14 @@ int opt_sum_query(TABLE_LIST *tables, List<Item> &all_fields,COND *conds)
           indexes to find the key.
         */
         Item *expr=item_sum->args[0];
-        if (expr->type() == Item::FIELD_ITEM)
+        if (expr->real_item()->type() == Item::FIELD_ITEM)
         {
           byte key_buff[MAX_KEY_LENGTH];
           TABLE_REF ref;
-	      uint range_fl, prefix_len;
+          uint range_fl, prefix_len;
 
           ref.key_buff= key_buff;
-	      Item_field *item_field= ((Item_field*) expr);
+          Item_field *item_field= (Item_field*) (expr->real_item());
           TABLE *table= item_field->field->table;
 
           /*