1 files changed, 50 insertions, 0 deletions
diff --git a/mysql-test/t/alter_table.test b/mysql-test/t/alter_table.test
index ee9616e233d..28dfbaa27ec 100644
--- a/mysql-test/t/alter_table.test
+++ b/mysql-test/t/alter_table.test
@@ -1272,3 +1272,53 @@ ALTER COLUMN `consultant_id` DROP DEFAULT,
 MODIFY COLUMN `consultant_id` BIGINT;
 SHOW CREATE TABLE t1;
 DROP TABLE t1;
+
+--echo #
+--echo # BUG#27788685: NO WARNING WHEN TRUNCATING A STRING WITH DATA LOSS
+--echo #
+
+SET GLOBAL max_allowed_packet=17825792;
+
+--connect(con1, localhost, root,,)
+CREATE TABLE t1 (t1_fld1 TEXT);
+CREATE TABLE t2 (t2_fld1 MEDIUMTEXT);
+CREATE TABLE t3 (t3_fld1 LONGTEXT);
+
+INSERT INTO t1 VALUES (REPEAT('a',300));
+INSERT INTO t2 VALUES (REPEAT('b',65680));
+INSERT INTO t3 VALUES (REPEAT('c',16777300));
+
+SELECT LENGTH(t1_fld1) FROM t1;
+SELECT LENGTH(t2_fld1) FROM t2;
+SELECT LENGTH(t3_fld1) FROM t3;
+
+--echo # With strict mode
+SET SQL_MODE='STRICT_ALL_TABLES';
+
+--error ER_DATA_TOO_LONG
+ALTER TABLE t1 CHANGE `t1_fld1` `my_t1_fld1` TINYTEXT;
+--error ER_DATA_TOO_LONG
+ALTER TABLE t2 CHANGE `t2_fld1` `my_t2_fld1` TEXT;
+--error ER_DATA_TOO_LONG
+ALTER TABLE t3 CHANGE `t3_fld1` `my_t3_fld1` MEDIUMTEXT;
+
+--echo # With non-strict mode
+SET SQL_MODE='';
+
+ALTER TABLE t1 CHANGE `t1_fld1` `my_t1_fld1` TINYTEXT;
+ALTER TABLE t2 CHANGE `t2_fld1` `my_t2_fld1` TEXT;
+ALTER TABLE t3 CHANGE `t3_fld1` `my_t3_fld1` MEDIUMTEXT;
+
+SELECT LENGTH(my_t1_fld1) FROM t1;
+SELECT LENGTH(my_t2_fld1) FROM t2;
+SELECT LENGTH(my_t3_fld1) FROM t3;
+
+# Cleanup
+--disconnect con1
+--source include/wait_until_disconnected.inc
+
+--connection default
+DROP TABLE t1, t2, t3;
+
+SET SQL_MODE=default;
+SET GLOBAL max_allowed_packet=default;