Fixed LP bug #806097.

The value of THD::used tables should be re-evaluated after merges
of views and derived tables into the main query. 
Now it's done in the function SELECT_LEX::update_used_tables.
The re-evaluation of the 'used_table' bitmaps for the items
in HAVING, GROUP BY and ORDER BY clauses has been added as well.
 

1 files changed, 28 insertions, 0 deletions

diff --git a/mysql-test/t/derived_view.test b/mysql-test/t/derived_view.test
index 26f428571ee..d7055f71382 100644
--- a/mysql-test/t/derived_view.test
+++ b/mysql-test/t/derived_view.test
@@ -503,3 +503,31 @@ SELECT * FROM v1 t
 
 DROP VIEW v1;
 DROP TABLE t1,t2,t3;
+
+--echo #
+--echo # LP bug #806097: left join over a view + DISTINCT           
+--echo #
+
+CREATE TABLE t1 (a int, b int);
+INSERT INTO t1 VALUES (252,6), (232,0), (174,232);
+
+CREATE TABLE t2 (a int);
+INSERT INTO t2 VALUES (232), (174);
+
+CREATE TABLE t3 (c int);
+INSERT INTO t3 VALUES (1), (2);
+
+CREATE VIEW v1 AS SELECT t2.a FROM t3,t2;
+
+SELECT v1.a FROM t1 LEFT JOIN v1 ON t1.b = 0;
+
+SELECT DISTINCT t2.a FROM t1 LEFT JOIN (t3,t2) ON t1.b = 0;
+EXPLAIN
+SELECT DISTINCT t2.a FROM t1 LEFT JOIN (t3,t2) ON t1.b = 0;
+
+SELECT DISTINCT v1.a FROM t1 LEFT JOIN v1 ON t1.b = 0;
+EXPLAIN
+SELECT DISTINCT v1.a FROM t1 LEFT JOIN v1 ON t1.b = 0;
+
+DROP VIEW v1;
+DROP TABLE t1,t2,t3;