MDEV-27065 Partitioning tables with custom data directories moves data back to default directory

The partitioning engine does not support the table-level DATA/INDEX
DIRECTORY specification.

If one create a non-partitioned table with the DATA/INDEX DIRECTORY
option and then performs ALTER TABLE ... PARTITION BY on it, the
DATA/INDEX DIRECTORY specification of the old schema is ignored.

The behavior might be a bit surprising for users because the value
of a usual table option applies to all the partitions. Thus, we raise
a warning on such ALTER TABLE ... PARTITION BY.

mysql-test/suite/parts/inc/part_alter_values.inc

@@ -36,12 +36,43 @@ ALTER TABLE t1 REORGANIZE PARTITION p1 INTO
 );
 DROP TABLE t1;
 
-#
-# MDEV-15456 Server crashes upon adding or dropping a partition in ALTER under LOCK TABLE after ER_SAME_NAME_PARTITION
-#
+--echo #
+--echo # MDEV-15456 Server crashes upon adding or dropping a partition in ALTER under LOCK TABLE after ER_SAME_NAME_PARTITION
+--echo #
 --eval create table t1 (i int) engine=$engine partition by range(i) (partition p0 values less than (10))
 lock table t1 write;
 --error ER_SAME_NAME_PARTITION
 alter table t1 add partition (partition p0 values less than (20));
 alter table t1 add partition (partition p1 values less than (20)) /* comment */;
 drop table t1;
+
+--echo #
+--echo # MDEV-27065 Partitioning tables with custom data directories moves data back to default directory
+--echo #
+
+--mkdir $MYSQLTEST_VARDIR/tmp/mdev_27065
+
+--disable_query_log
+--eval CREATE TABLE t1 (id INT) ENGINE=$engine DATA DIRECTORY='$MYSQLTEST_VARDIR/tmp/mdev_27065'
+--enable_query_log
+ALTER TABLE t1 PARTITION BY RANGE(id)(
+  PARTITION p0 VALUES LESS THAN (1000),
+  PARTITION p1 VALUES LESS THAN MAXVALUE
+);
+DROP TABLE t1;
+
+# InnoDB doesn't support INDEX DIRECTORY.
+if (`SELECT IF('$engine' != 'InnoDB', 1, 0)`)
+{
+  --disable_query_log
+  --eval CREATE TABLE t2 (id INT) ENGINE=$engine INDEX DIRECTORY='$MYSQLTEST_VARDIR/tmp/mdev_27065'
+  --enable_query_log
+  ALTER TABLE t2 PARTITION BY RANGE(id)(
+    PARTITION p0 VALUES LESS THAN (1000),
+    PARTITION p1 VALUES LESS THAN MAXVALUE
+  );
+  DROP TABLE t2;
+}
+
+--remove_files_wildcard $MYSQLTEST_VARDIR/tmp/mdev_27065 *
+--rmdir $MYSQLTEST_VARDIR/tmp/mdev_27065

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

@@ -42,9 +42,22 @@ PARTITION p3 VALUES IN (4,5,6)
 );
 ERROR HY000: Syntax error: LIST PARTITIONING requires definition of VALUES IN for each partition
 DROP TABLE t1;
+#
+# MDEV-15456 Server crashes upon adding or dropping a partition in ALTER under LOCK TABLE after ER_SAME_NAME_PARTITION
+#
 create table t1 (i int) engine=InnoDB partition by range(i) (partition p0 values less than (10));
 lock table t1 write;
 alter table t1 add partition (partition p0 values less than (20));
 ERROR HY000: Duplicate partition name p0
 alter table t1 add partition (partition p1 values less than (20)) /* comment */;
 drop table t1;
+#
+# MDEV-27065 Partitioning tables with custom data directories moves data back to default directory
+#
+ALTER TABLE t1 PARTITION BY RANGE(id)(
+PARTITION p0 VALUES LESS THAN (1000),
+PARTITION p1 VALUES LESS THAN MAXVALUE
+);
+Warnings:
+Warning	1618	<DATA DIRECTORY> table option of old schema is ignored
+DROP TABLE t1;

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

@@ -69,9 +69,29 @@ PARTITION p3 VALUES IN (4,5,6)
 );
 ERROR HY000: Syntax error: LIST PARTITIONING requires definition of VALUES IN for each partition
 DROP TABLE t1;
+#
+# MDEV-15456 Server crashes upon adding or dropping a partition in ALTER under LOCK TABLE after ER_SAME_NAME_PARTITION
+#
 create table t1 (i int) engine=Aria partition by range(i) (partition p0 values less than (10));
 lock table t1 write;
 alter table t1 add partition (partition p0 values less than (20));
 ERROR HY000: Duplicate partition name p0
 alter table t1 add partition (partition p1 values less than (20)) /* comment */;
 drop table t1;
+#
+# MDEV-27065 Partitioning tables with custom data directories moves data back to default directory
+#
+ALTER TABLE t1 PARTITION BY RANGE(id)(
+PARTITION p0 VALUES LESS THAN (1000),
+PARTITION p1 VALUES LESS THAN MAXVALUE
+);
+Warnings:
+Warning	1618	<DATA DIRECTORY> table option of old schema is ignored
+DROP TABLE t1;
+ALTER TABLE t2 PARTITION BY RANGE(id)(
+PARTITION p0 VALUES LESS THAN (1000),
+PARTITION p1 VALUES LESS THAN MAXVALUE
+);
+Warnings:
+Warning	1618	<INDEX DIRECTORY> table option of old schema is ignored
+DROP TABLE t2;

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

@@ -42,12 +42,32 @@ PARTITION p3 VALUES IN (4,5,6)
 );
 ERROR HY000: Syntax error: LIST PARTITIONING requires definition of VALUES IN for each partition
 DROP TABLE t1;
+#
+# MDEV-15456 Server crashes upon adding or dropping a partition in ALTER under LOCK TABLE after ER_SAME_NAME_PARTITION
+#
 create table t1 (i int) engine=MyISAM partition by range(i) (partition p0 values less than (10));
 lock table t1 write;
 alter table t1 add partition (partition p0 values less than (20));
 ERROR HY000: Duplicate partition name p0
 alter table t1 add partition (partition p1 values less than (20)) /* comment */;
 drop table t1;
+#
+# MDEV-27065 Partitioning tables with custom data directories moves data back to default directory
+#
+ALTER TABLE t1 PARTITION BY RANGE(id)(
+PARTITION p0 VALUES LESS THAN (1000),
+PARTITION p1 VALUES LESS THAN MAXVALUE
+);
+Warnings:
+Warning	1618	<DATA DIRECTORY> table option of old schema is ignored
+DROP TABLE t1;
+ALTER TABLE t2 PARTITION BY RANGE(id)(
+PARTITION p0 VALUES LESS THAN (1000),
+PARTITION p1 VALUES LESS THAN MAXVALUE
+);
+Warnings:
+Warning	1618	<INDEX DIRECTORY> table option of old schema is ignored
+DROP TABLE t2;
 create table t1 ( c1 int, c2 int, c3 varchar(100)) delay_key_write=1
 partition by key(c1) (
 partition p01 data directory = 'MYSQL_TMP_DIR'

sql/ha_partition.cc

@@ -678,6 +678,7 @@ int ha_partition::create(const char *name, TABLE *table_arg,
 			 HA_CREATE_INFO *create_info)
 {
   int error;
+  THD *thd= ha_thd();
   char name_buff[FN_REFLEN + 1], name_lc_buff[FN_REFLEN];
   char *name_buffer_ptr;
   const char *path;
@@ -695,8 +696,27 @@ int ha_partition::create(const char *name, TABLE *table_arg,
     my_error(ER_PARTITION_NO_TEMPORARY, MYF(0));
     DBUG_RETURN(TRUE);
   }
+  /*
+    The following block should be removed once the table-level data directory
+    specification is supported by the partitioning engine (MDEV-28108).
+  */
+  if (thd_sql_command(thd) == SQLCOM_ALTER_TABLE && create_info)
+  {
+    if (create_info->data_file_name)
+    {
+      push_warning_printf(
+          thd, Sql_condition::WARN_LEVEL_WARN, WARN_OPTION_IGNORED,
+          "<DATA DIRECTORY> table option of old schema is ignored");
+    }
+    if (create_info->index_file_name)
+    {
+      push_warning_printf(
+          thd, Sql_condition::WARN_LEVEL_WARN, WARN_OPTION_IGNORED,
+          "<INDEX DIRECTORY> table option of old schema is ignored");
+    }
+  }
 
-  if (get_from_handler_file(name, ha_thd()->mem_root, false))
+  if (get_from_handler_file(name, thd->mem_root, false))
     DBUG_RETURN(TRUE);
   DBUG_ASSERT(m_file_buffer);
   DBUG_PRINT("enter", ("name: (%s)", name));