From def42df9feebef4d513e834cfeacf73691927110 Mon Sep 17 00:00:00 2001
From: unknown <evgen@moonbone.local>
Date: Mon, 15 Aug 2005 23:05:05 +0400
Subject: [PATCH] Fix bug #10624 Views with multiple UNION and UNION ALL
 produce incorrect results.

st_select_lex_unit::print() was losing UNION ALL if in statement were present
UNION DISTINCT.


mysql-test/r/view.result:
  Test case for bug #10624  Views with multiple UNION and UNION ALL produce incorrect results.
mysql-test/t/view.test:
  Test case for bug #10624  Views with multiple UNION and UNION ALL produce incorrect results.
sql/sql_lex.cc:
  Fix bug #10624 Views with multiple UNION and UNION ALL produce incorrect results.
---
 mysql-test/r/view.result | 12 ++++++++++++
 mysql-test/t/view.test   | 12 ++++++++++++
 sql/sql_lex.cc           |  5 ++++-
 3 files changed, 28 insertions(+), 1 deletion(-)

diff --git a/mysql-test/r/view.result b/mysql-test/r/view.result
index 2af2f06ad52..a1566fa30c2 100644
--- a/mysql-test/r/view.result
+++ b/mysql-test/r/view.result
@@ -2097,3 +2097,15 @@ select * from v1;
 f1
 1
 drop view v1;
+create table t1 (f1 int);
+create table t2 (f1 int);
+insert into t1 values (1);
+insert into t2 values (2);
+create view v1 as select * from t1 union select * from t2 union all select * from t2;
+select * from v1;
+f1
+1
+2
+2
+drop view v1;
+drop table t1,t2;
diff --git a/mysql-test/t/view.test b/mysql-test/t/view.test
index ceff7af401c..f2fe5f460e2 100644
--- a/mysql-test/t/view.test
+++ b/mysql-test/t/view.test
@@ -1942,3 +1942,15 @@ DROP TABLE t1,t2,t3,t4,t5;
 create view v1 as select timestampdiff(day,'1997-01-01 00:00:00','1997-01-02 00:00:00') as f1;
 select * from v1;
 drop view v1;
+
+#
+# Bug #10624 Views with multiple UNION and UNION ALL produce incorrect results
+#
+create table t1 (f1 int);
+create table t2 (f1 int);
+insert into t1 values (1);
+insert into t2 values (2);
+create view v1 as select * from t1 union select * from t2 union all select * from t2;
+select * from v1;
+drop view v1;
+drop table t1,t2;
diff --git a/sql/sql_lex.cc b/sql/sql_lex.cc
index 86e677cc8dc..bbff64e516f 100644
--- a/sql/sql_lex.cc
+++ b/sql/sql_lex.cc
@@ -1511,13 +1511,16 @@ bool st_select_lex::setup_ref_array(THD *thd, uint order_group_num)
 
 void st_select_lex_unit::print(String *str)
 {
+  bool union_all= !union_distinct;
   for (SELECT_LEX *sl= first_select(); sl; sl= sl->next_select())
   {
     if (sl != first_select())
     {
       str->append(" union ", 7);
-      if (!union_distinct)
+      if (union_all)
 	str->append("all ", 4);
+      else if (union_distinct == sl)
+        union_all= true;
     }
     if (sl->braces)
       str->append('(');