Fix for BUG#27610: ALTER TABLE ROW_FORMAT=... does not

rebuild the table.

The problem was that ROW_FORMAT clause in ALTER TABLE did not trigger
table reconstruction.

The fix is to rebuild a table if ROW_FORMAT is specified.

mysql-test/include/mix1.inc

@@ -1019,6 +1019,55 @@ SELECT * FROM t1 ORDER BY b DESC, a ASC;
 
 DROP TABLE t1;
 
+###########################################################################
+
+--echo
+--echo #
+--echo # Bug#27610: ALTER TABLE ROW_FORMAT=... does not rebuild the table.
+--echo #
+
+--echo
+--echo # - prepare;
+--echo
+
+--disable_warnings
+DROP TABLE IF EXISTS t1;
+--enable_warnings
+
+--echo
+
+CREATE TABLE t1(c INT)
+  ENGINE = InnoDB
+  ROW_FORMAT = COMPACT;
+
+--echo
+--echo # - initial check;
+--echo
+
+SELECT table_schema, table_name, row_format
+FROM INFORMATION_SCHEMA.TABLES
+WHERE table_schema = DATABASE() AND table_name = 't1';
+
+--echo
+--echo # - change ROW_FORMAT and check;
+--echo
+
+ALTER TABLE t1 ROW_FORMAT = REDUNDANT;
+
+--echo
+
+SELECT table_schema, table_name, row_format
+FROM INFORMATION_SCHEMA.TABLES
+WHERE table_schema = DATABASE() AND table_name = 't1';
+
+--echo
+--echo # - that's it, cleanup.
+--echo
+
+DROP TABLE t1;
+
+###########################################################################
+
 --echo End of 5.0 tests
 
 # Fix for BUG#19243 "wrong LAST_INSERT_ID() after ON DUPLICATE KEY

mysql-test/r/innodb_mysql.result

@@ -1286,6 +1286,40 @@ a	b
 2	2
 3	2
 1	1
+DROP TABLE t1;
+
+#
+# Bug#27610: ALTER TABLE ROW_FORMAT=... does not rebuild the table.
+#
+
+# - prepare;
+
+DROP TABLE IF EXISTS t1;
+
+CREATE TABLE t1(c INT)
+ENGINE = InnoDB
+ROW_FORMAT = COMPACT;
+
+# - initial check;
+
+SELECT table_schema, table_name, row_format
+FROM INFORMATION_SCHEMA.TABLES
+WHERE table_schema = DATABASE() AND table_name = 't1';
+table_schema	table_name	row_format
+test	t1	Compact
+
+# - change ROW_FORMAT and check;
+
+ALTER TABLE t1 ROW_FORMAT = REDUNDANT;
+
+SELECT table_schema, table_name, row_format
+FROM INFORMATION_SCHEMA.TABLES
+WHERE table_schema = DATABASE() AND table_name = 't1';
+table_schema	table_name	row_format
+test	t1	Redundant
+
+# - that's it, cleanup.
+
 DROP TABLE t1;
 End of 5.0 tests
 CREATE TABLE `t2` (

sql/sql_table.cc

@@ -4985,6 +4985,7 @@ compare_tables(TABLE *table,
       create_info->used_fields & HA_CREATE_USED_ENGINE ||
       create_info->used_fields & HA_CREATE_USED_CHARSET ||
       create_info->used_fields & HA_CREATE_USED_DEFAULT_CHARSET ||
+      create_info->used_fields & HA_CREATE_USED_ROW_FORMAT ||
       (alter_info->flags & (ALTER_RECREATE | ALTER_FOREIGN_KEY)) ||
       order_num ||
       !table->s->mysql_version ||