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-rw-r--r--mysql-test/r/func_gconcat.result9
-rw-r--r--mysql-test/t/func_gconcat.test9
2 files changed, 18 insertions, 0 deletions
diff --git a/mysql-test/r/func_gconcat.result b/mysql-test/r/func_gconcat.result
index 7ae7806baea..d257e526abf 100644
--- a/mysql-test/r/func_gconcat.result
+++ b/mysql-test/r/func_gconcat.result
@@ -867,4 +867,13 @@ select group_concat(distinct a, c order by a desc, c desc) from t1;
group_concat(distinct a, c order by a desc, c desc)
31,11,10,01,00
drop table t1;
+create table t1 (f1 char(20));
+insert into t1 values (''),('');
+select group_concat(distinct f1) from t1;
+group_concat(distinct f1)
+
+select group_concat(f1) from t1;
+group_concat(f1)
+,
+drop table t1;
End of 5.0 tests
diff --git a/mysql-test/t/func_gconcat.test b/mysql-test/t/func_gconcat.test
index 4c5dd6467bd..322be2b7b8e 100644
--- a/mysql-test/t/func_gconcat.test
+++ b/mysql-test/t/func_gconcat.test
@@ -590,4 +590,13 @@ select group_concat(distinct a, c order by a desc, c desc) from t1;
drop table t1;
+#
+# Bug#30897 GROUP_CONCAT returns extra comma on empty fields
+#
+create table t1 (f1 char(20));
+insert into t1 values (''),('');
+select group_concat(distinct f1) from t1;
+select group_concat(f1) from t1;
+drop table t1;
+
--echo End of 5.0 tests