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-rw-r--r--mysql-test/r/type_bit.result15
1 files changed, 15 insertions, 0 deletions
diff --git a/mysql-test/r/type_bit.result b/mysql-test/r/type_bit.result
index e8c8c6c65a4..f2f21b90e06 100644
--- a/mysql-test/r/type_bit.result
+++ b/mysql-test/r/type_bit.result
@@ -785,4 +785,19 @@ t1 CREATE TABLE `t1` (
KEY `a` (`a`)
) ENGINE=MyISAM DEFAULT CHARSET=latin1
drop table t1;
+#
+# Bug#50591 bit(31) causes Duplicate entry '1-NULL' for key 'group_key'
+#
+CREATE TABLE t1(a INT, b BIT(7) NOT NULL);
+INSERT INTO t1 VALUES (NULL, 0),(NULL, 0);
+SELECT SUM(a) FROM t1 GROUP BY b, a;
+SUM(a)
+NULL
+DROP TABLE t1;
+CREATE TABLE t1(a INT, b BIT(7) NOT NULL, c BIT(8) NOT NULL);
+INSERT INTO t1 VALUES (NULL, 0, 0),(NULL, 0, 0);
+SELECT SUM(a) FROM t1 GROUP BY c, b, a;
+SUM(a)
+NULL
+DROP TABLE t1;
End of 5.1 tests