MDEV-14641 Incompatible key or row definition between the MariaDB .frm file and the information in the storage engine

make sure that mysql_create_frm_image() and fast_alter_partition_table()
use the same code to derive HA_OPTION_PACK_RECORD from
create_info->row_type.

mysql-test/suite/parts/r/partition_alter_myisam.result

@@ -0,0 +1,10 @@
+CREATE TABLE t1 (i INT) ENGINE=MYISAM
+PARTITION BY LIST(i) (
+PARTITION p0 VALUES IN (1),
+PARTITION p1 VALUES IN (2)
+);
+ALTER TABLE t1 ROW_FORMAT=COMPRESSED;
+ALTER TABLE t1 DROP PARTITION p1;
+SELECT * FROM t1;
+i
+DROP TABLE t1;

mysql-test/suite/parts/t/partition_alter_myisam.test

@@ -0,0 +1,17 @@
+#
+# MDEV-14641 Incompatible key or row definition between the MariaDB .frm file and the information in the storage engine
+#
+
+--source include/have_partition.inc
+
+CREATE TABLE t1 (i INT) ENGINE=MYISAM
+PARTITION BY LIST(i) (
+  PARTITION p0 VALUES IN (1),
+  PARTITION p1 VALUES IN (2)
+);
+ALTER TABLE t1 ROW_FORMAT=COMPRESSED;
+ALTER TABLE t1 DROP PARTITION p1;
+SELECT * FROM t1;
+
+# Cleanup
+DROP TABLE t1;

sql/handler.h

@@ -1666,6 +1666,13 @@ struct HA_CREATE_INFO
     used_fields|= (HA_CREATE_USED_CHARSET | HA_CREATE_USED_DEFAULT_CHARSET);  
     return false;
   }
+  ulong table_options_with_row_type()
+  {
+    if (row_type == ROW_TYPE_DYNAMIC || row_type == ROW_TYPE_PAGE)
+      return table_options | HA_OPTION_PACK_RECORD;
+    else
+      return table_options;
+  }
 };
 
 

sql/sql_partition.cc

@@ -6834,10 +6834,7 @@ uint fast_alter_partition_table(THD *thd, TABLE *table,
   lpt->part_info= part_info;
   lpt->alter_info= alter_info;
   lpt->create_info= create_info;
-  lpt->db_options= create_info->table_options;
-  if (create_info->row_type != ROW_TYPE_FIXED &&
-      create_info->row_type != ROW_TYPE_DEFAULT)
-    lpt->db_options|= HA_OPTION_PACK_RECORD;
+  lpt->db_options= create_info->table_options_with_row_type();
   lpt->table= table;
   lpt->key_info_buffer= 0;
   lpt->key_count= 0;

sql/sql_table.cc

@@ -4405,10 +4405,7 @@ handler *mysql_create_frm_image(THD *thd,
 
   set_table_default_charset(thd, create_info, (char*) db);
 
-  db_options= create_info->table_options;
-  if (create_info->row_type == ROW_TYPE_DYNAMIC ||
-      create_info->row_type == ROW_TYPE_PAGE)
-    db_options|= HA_OPTION_PACK_RECORD;
+  db_options= create_info->table_options_with_row_type();
 
   if (!(file= get_new_handler((TABLE_SHARE*) 0, thd->mem_root,
                               create_info->db_type)))