MDEV-15953 Alter InnoDB Partitioned Table ignores pre-existing DATA DIRECTORY attribute

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

+#
+# MDEV-15953 Alter InnoDB Partitioned Table Moves Files (which were originally not in the datadir) to the datadir
+#
+CREATE TABLE t (
+a INT NOT NULL
+) ENGINE=INNODB
+PARTITION BY HASH (a) (
+PARTITION p1 DATA DIRECTORY = 'MYSQLTEST_VARDIR/tmp/partitions_here/' ENGINE = INNODB,
+PARTITION p2 DATA DIRECTORY = 'MYSQLTEST_VARDIR/tmp/partitions_here/' ENGINE = INNODB
+);
+INSERT INTO t VALUES (1);
+SHOW CREATE TABLE t;
+Table	Create Table
+t	CREATE TABLE `t` (
+  `a` int(11) NOT NULL
+) ENGINE=InnoDB DEFAULT CHARSET=latin1
+/*!50100 PARTITION BY HASH (a)
+(PARTITION p1 DATA DIRECTORY = 'MYSQLTEST_VARDIR/tmp/partitions_here' ENGINE = InnoDB,
+ PARTITION p2 DATA DIRECTORY = 'MYSQLTEST_VARDIR/tmp/partitions_here' ENGINE = InnoDB) */
+ALTER TABLE t ADD PRIMARY KEY pk(a), ALGORITHM=INPLACE;
+SHOW CREATE TABLE t;
+Table	Create Table
+t	CREATE TABLE `t` (
+  `a` int(11) NOT NULL,
+  PRIMARY KEY (`a`)
+) ENGINE=InnoDB DEFAULT CHARSET=latin1
+/*!50100 PARTITION BY HASH (a)
+(PARTITION p1 DATA DIRECTORY = 'MYSQLTEST_VARDIR/tmp/partitions_here' ENGINE = InnoDB,
+ PARTITION p2 DATA DIRECTORY = 'MYSQLTEST_VARDIR/tmp/partitions_here' ENGINE = InnoDB) */
+ALTER TABLE t DROP PRIMARY KEY, ALGORITHM=COPY;
+SHOW CREATE TABLE t;
+Table	Create Table
+t	CREATE TABLE `t` (
+  `a` int(11) NOT NULL
+) ENGINE=InnoDB DEFAULT CHARSET=latin1
+/*!50100 PARTITION BY HASH (a)
+(PARTITION p1 DATA DIRECTORY = 'MYSQLTEST_VARDIR/tmp/partitions_here' ENGINE = InnoDB,
+ PARTITION p2 DATA DIRECTORY = 'MYSQLTEST_VARDIR/tmp/partitions_here' ENGINE = InnoDB) */
+SET @TMP = @@GLOBAL.INNODB_FILE_PER_TABLE;
+SET GLOBAL INNODB_FILE_PER_TABLE=OFF;
+ALTER TABLE t ADD PRIMARY KEY pk(a), ALGORITHM=INPLACE;
+SHOW CREATE TABLE t;
+Table	Create Table
+t	CREATE TABLE `t` (
+  `a` int(11) NOT NULL,
+  PRIMARY KEY (`a`)
+) ENGINE=InnoDB DEFAULT CHARSET=latin1
+/*!50100 PARTITION BY HASH (a)
+(PARTITION p1 DATA DIRECTORY = 'MYSQLTEST_VARDIR/tmp/partitions_here' ENGINE = InnoDB,
+ PARTITION p2 DATA DIRECTORY = 'MYSQLTEST_VARDIR/tmp/partitions_here' ENGINE = InnoDB) */
+SET GLOBAL INNODB_FILE_PER_TABLE=@TMP;
+ALTER TABLE t REORGANIZE PARTITION p1,p2 INTO (
+PARTITION p1 DATA DIRECTORY = 'MYSQLTEST_VARDIR/tmp/partitions_somewhere_else/' ENGINE = INNODB,
+PARTITION p2 DATA DIRECTORY = 'MYSQLTEST_VARDIR/tmp/partitions_somewhere_else/' ENGINE = INNODB
+);
+SHOW CREATE TABLE t;
+Table	Create Table
+t	CREATE TABLE `t` (
+  `a` int(11) NOT NULL,
+  PRIMARY KEY (`a`)
+) ENGINE=InnoDB DEFAULT CHARSET=latin1
+/*!50100 PARTITION BY HASH (a)
+(PARTITION p1 DATA DIRECTORY = 'MYSQLTEST_VARDIR/tmp/partitions_here' ENGINE = InnoDB,
+ PARTITION p2 DATA DIRECTORY = 'MYSQLTEST_VARDIR/tmp/partitions_here' ENGINE = InnoDB) */
+DROP TABLE t;

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

+--source include/have_innodb.inc
+--source include/have_partition.inc
+
+--echo #
+--echo # MDEV-15953 Alter InnoDB Partitioned Table Moves Files (which were originally not in the datadir) to the datadir
+--echo #
+
+mkdir $MYSQLTEST_VARDIR/tmp/partitions_here;
+
+--replace_result $MYSQLTEST_VARDIR MYSQLTEST_VARDIR
+eval CREATE TABLE t (
+  a INT NOT NULL
+) ENGINE=INNODB
+PARTITION BY HASH (a) (
+  PARTITION p1 DATA DIRECTORY = '$MYSQLTEST_VARDIR/tmp/partitions_here/' ENGINE = INNODB,
+  PARTITION p2 DATA DIRECTORY = '$MYSQLTEST_VARDIR/tmp/partitions_here/' ENGINE = INNODB
+);
+INSERT INTO t VALUES (1);
+
+--replace_result $MYSQLTEST_VARDIR MYSQLTEST_VARDIR
+SHOW CREATE TABLE t;
+ALTER TABLE t ADD PRIMARY KEY pk(a), ALGORITHM=INPLACE;
+--replace_result $MYSQLTEST_VARDIR MYSQLTEST_VARDIR
+SHOW CREATE TABLE t;
+ALTER TABLE t DROP PRIMARY KEY, ALGORITHM=COPY;
+--replace_result $MYSQLTEST_VARDIR MYSQLTEST_VARDIR
+SHOW CREATE TABLE t;
+SET @TMP = @@GLOBAL.INNODB_FILE_PER_TABLE;
+SET GLOBAL INNODB_FILE_PER_TABLE=OFF;
+ALTER TABLE t ADD PRIMARY KEY pk(a), ALGORITHM=INPLACE;
+--replace_result $MYSQLTEST_VARDIR MYSQLTEST_VARDIR
+SHOW CREATE TABLE t;
+SET GLOBAL INNODB_FILE_PER_TABLE=@TMP;
+
+--replace_result $MYSQLTEST_VARDIR MYSQLTEST_VARDIR
+eval ALTER TABLE t REORGANIZE PARTITION p1,p2 INTO (
+  PARTITION p1 DATA DIRECTORY = '$MYSQLTEST_VARDIR/tmp/partitions_somewhere_else/' ENGINE = INNODB,
+  PARTITION p2 DATA DIRECTORY = '$MYSQLTEST_VARDIR/tmp/partitions_somewhere_else/' ENGINE = INNODB
+);
+--replace_result $MYSQLTEST_VARDIR MYSQLTEST_VARDIR
+SHOW CREATE TABLE t;
+
+DROP TABLE t;
+
+rmdir $MYSQLTEST_VARDIR/tmp/partitions_here/test;
+rmdir $MYSQLTEST_VARDIR/tmp/partitions_here;

storage/innobase/handler/handler0alter.cc

@@ -3572,6 +3572,12 @@ ha_innobase::prepare_inplace_alter_table(
 		goto err_exit_no_heap;
 	}
 
+	/* Preserve this flag, because it currenlty can't be changed during
+	ALTER TABLE*/
+	if (flags2 & DICT_TF2_USE_TABLESPACE) {
+		flags |= prebuilt->table->flags & 1U << DICT_TF_POS_DATA_DIR;
+	}
+
 	max_col_len = DICT_MAX_FIELD_LEN_BY_FORMAT_FLAG(flags);
 
 	/* Check each index's column length to make sure they do not

storage/xtradb/handler/handler0alter.cc

@@ -3586,6 +3586,12 @@ ha_innobase::prepare_inplace_alter_table(
 		goto err_exit_no_heap;
 	}
 
+	/* Preserve this flag, because it currenlty can't be changed during
+	ALTER TABLE*/
+	if (flags2 & DICT_TF2_USE_TABLESPACE) {
+		flags |= prebuilt->table->flags & 1U << DICT_TF_POS_DATA_DIR;
+	}
+
 	max_col_len = DICT_MAX_FIELD_LEN_BY_FORMAT_FLAG(flags);
 
 	/* Check each index's column length to make sure they do not