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-rw-r--r--mysql-test/r/func_misc.result6
-rw-r--r--mysql-test/t/func_misc.test8
2 files changed, 14 insertions, 0 deletions
diff --git a/mysql-test/r/func_misc.result b/mysql-test/r/func_misc.result
index 35101e26ff6..db2490bd261 100644
--- a/mysql-test/r/func_misc.result
+++ b/mysql-test/r/func_misc.result
@@ -185,4 +185,10 @@ ERROR 21000: Operand should contain 1 column(s)
drop table table_26093;
drop function func_26093_a;
drop function func_26093_b;
+create table t1 (a int not null);
+insert into t1 values (-1), (-2);
+select min(a) from t1 group by inet_ntoa(a);
+min(a)
+-2
+drop table t1;
End of 5.0 tests
diff --git a/mysql-test/t/func_misc.test b/mysql-test/t/func_misc.test
index 8ff62f68e45..5a70daa50e8 100644
--- a/mysql-test/t/func_misc.test
+++ b/mysql-test/t/func_misc.test
@@ -189,4 +189,12 @@ drop table table_26093;
drop function func_26093_a;
drop function func_26093_b;
+#
+# Bug #31349: ERROR 1062 (23000): Duplicate entry '' for key 'group_key'
+#
+create table t1 (a int not null);
+insert into t1 values (-1), (-2);
+select min(a) from t1 group by inet_ntoa(a);
+drop table t1;
+
--echo End of 5.0 tests