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-rw-r--r--mysql-test/t/user_var.test6
1 files changed, 6 insertions, 0 deletions
diff --git a/mysql-test/t/user_var.test b/mysql-test/t/user_var.test
index 601724e68c8..3816af42c55 100644
--- a/mysql-test/t/user_var.test
+++ b/mysql-test/t/user_var.test
@@ -120,3 +120,9 @@ show binlog events from 79;
drop table t1, t2;
+#
+# Bug #6321 strange error:
+# string function FIELD(<uservariable content NULL>, ...)
+#
+set @var= NULL ;
+select FIELD( @var,'1it','Hit') as my_column;