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-rw-r--r--mysql-test/t/func_gconcat.test5
1 files changed, 5 insertions, 0 deletions
diff --git a/mysql-test/t/func_gconcat.test b/mysql-test/t/func_gconcat.test
index e30dcfae973..fc7ce8e38a5 100644
--- a/mysql-test/t/func_gconcat.test
+++ b/mysql-test/t/func_gconcat.test
@@ -350,4 +350,9 @@ SELECT COUNT(*), GROUP_CONCAT(DISTINCT t2.somename SEPARATOR ' |')
DROP TABLE t1,t2;
+#
+# Bug #12861 hang with group_concat insubquery FROM DUAL
+#
+select * from (select group_concat('c') from DUAL) t;
+
# End of 4.1 tests