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-rw-r--r--mysql-test/suite/innodb/r/instant_alter_charset.result11
1 files changed, 11 insertions, 0 deletions
diff --git a/mysql-test/suite/innodb/r/instant_alter_charset.result b/mysql-test/suite/innodb/r/instant_alter_charset.result
index f8c21978327..cbb49819bfe 100644
--- a/mysql-test/suite/innodb/r/instant_alter_charset.result
+++ b/mysql-test/suite/innodb/r/instant_alter_charset.result
@@ -1918,3 +1918,14 @@ check table t;
Table Op Msg_type Msg_text
test.t check status OK
drop table t;
+#
+# MDEV-20726: InnoDB: Assertion failure in file data0type.cc line 67
+#
+CREATE TABLE t (
+id int(10) unsigned NOT NULL PRIMARY KEY,
+a text CHARSET utf8mb3,
+KEY a_idx(a(1))
+) ENGINE=InnoDB;
+INSERT INTO t VALUES (1, 'something in the air');
+ALTER TABLE t MODIFY a text CHARSET utf8mb4;
+DROP TABLE t;