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-rw-r--r--mysql-test/r/derived.result23
1 files changed, 23 insertions, 0 deletions
diff --git a/mysql-test/r/derived.result b/mysql-test/r/derived.result
index 2f6662e0132..c8736b557de 100644
--- a/mysql-test/r/derived.result
+++ b/mysql-test/r/derived.result
@@ -1013,6 +1013,29 @@ David Yes 210
Edward Yes 150
DROP TABLE example1463;
set sql_mode= @save_sql_mode;
+#
+# MDEV-9028: SELECT DISTINCT constant column of derived table
+# used as the second operand of LEFT JOIN
+#
+create table t1 (id int, data varchar(255));
+insert into t1 values (1,'yes'),(2,'yes');
+select distinct t1.id, tt.id, tt.data
+from t1
+left join
+(select t1.id, 'yes' as data from t1) as tt
+on t1.id = tt.id;
+id id data
+1 1 yes
+2 2 yes
+select distinct t1.id, tt.id, tt.data
+from t1
+left join
+(select t1.id, 'yes' as data from t1 where id > 1) as tt
+on t1.id = tt.id;
+id id data
+2 2 yes
+1 NULL NULL
+drop table t1;
# end of 5.5
#
# Start of 10.1 tests