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-rw-r--r--mysql-test/t/func_str.test6
1 files changed, 6 insertions, 0 deletions
diff --git a/mysql-test/t/func_str.test b/mysql-test/t/func_str.test
index ffbcc1d774b..a69febef340 100644
--- a/mysql-test/t/func_str.test
+++ b/mysql-test/t/func_str.test
@@ -479,3 +479,9 @@ EXPLAIN
WHERE a = CONV('e251273eb74a8ee3', 16, 10);
DROP TABLE t1;
+
+#
+# Bug #6317: string function CHAR, parameter is NULL, wrong result
+#
+SELECT CHAR(NULL,121,83,81,'76') as my_column;
+SELECT CHAR_LENGTH(CHAR(NULL,121,83,81,'76')) as my_column;