MDEV-25917 create table like fails if source table is partitioned and engine is myisam or aria with data directory.

Create table like removes data_file_path/index_file_path from the
thd->work_partition_info.

mysql-test/r/partition_symlink.result

@@ -177,3 +177,97 @@ partition by key (a)
 (partition p0,
 partition p1 DATA DIRECTORY 'part-data' INDEX DIRECTORY 'part-data');
 Got one of the listed errors
+#
+# MDEV-25917 create table like fails if source table is partitioned and engine is myisam or aria with data directory.
+#
+CREATE TABLE t1 (a INT)
+ENGINE = MyISAM
+PARTITION BY LIST (a)
+(PARTITION p0 VALUES IN (0)
+DATA DIRECTORY 'MYSQLTEST_VARDIR/tmp'
+  INDEX DIRECTORY 'MYSQLTEST_VARDIR/tmp',
+PARTITION p1 VALUES IN (1)
+DATA DIRECTORY 'MYSQLTEST_VARDIR/tmp'
+  INDEX DIRECTORY 'MYSQLTEST_VARDIR/tmp',
+PARTITION p2 VALUES IN (2));
+CREATE TABLE t2 LIKE t1;
+SHOW CREATE TABLE t1;
+Table	Create Table
+t1	CREATE TABLE `t1` (
+  `a` int(11) DEFAULT NULL
+) ENGINE=MyISAM DEFAULT CHARSET=latin1
+ PARTITION BY LIST (`a`)
+(PARTITION `p0` VALUES IN (0) DATA DIRECTORY = 'MYSQLTEST_VARDIR/tmp' INDEX DIRECTORY = 'MYSQLTEST_VARDIR/tmp' ENGINE = MyISAM,
+ PARTITION `p1` VALUES IN (1) DATA DIRECTORY = 'MYSQLTEST_VARDIR/tmp' INDEX DIRECTORY = 'MYSQLTEST_VARDIR/tmp' ENGINE = MyISAM,
+ PARTITION `p2` VALUES IN (2) ENGINE = MyISAM)
+SHOW CREATE TABLE t2;
+Table	Create Table
+t2	CREATE TABLE `t2` (
+  `a` int(11) DEFAULT NULL
+) ENGINE=MyISAM DEFAULT CHARSET=latin1
+ PARTITION BY LIST (`a`)
+(PARTITION `p0` VALUES IN (0) ENGINE = MyISAM,
+ PARTITION `p1` VALUES IN (1) ENGINE = MyISAM,
+ PARTITION `p2` VALUES IN (2) ENGINE = MyISAM)
+DROP TABLE t1, t2;
+CREATE TABLE t1 (
+ID int(11) NOT NULL,
+type int(11)) Engine=MyISAM
+PARTITION BY RANGE(ID)
+SUBPARTITION BY HASH(type)
+(
+PARTITION p01 VALUES LESS THAN(100)
+(SUBPARTITION s11
+DATA DIRECTORY 'MYSQLTEST_VARDIR/tmp'
+           INDEX DIRECTORY 'MYSQLTEST_VARDIR/tmp',
+SUBPARTITION s12
+DATA DIRECTORY 'MYSQLTEST_VARDIR/tmp'
+           INDEX DIRECTORY 'MYSQLTEST_VARDIR/tmp'
+      ),
+PARTITION p11 VALUES LESS THAN(200)
+(SUBPARTITION s21, SUBPARTITION s22),
+PARTITION p21 VALUES LESS THAN MAXVALUE
+(SUBPARTITION s31
+DATA DIRECTORY 'MYSQLTEST_VARDIR/tmp'
+           INDEX DIRECTORY 'MYSQLTEST_VARDIR/tmp',
+SUBPARTITION s32
+DATA DIRECTORY 'MYSQLTEST_VARDIR/tmp'
+           INDEX DIRECTORY 'MYSQLTEST_VARDIR/tmp'
+      )
+);
+CREATE TABLE t2 LIKE t1;
+SHOW CREATE TABLE t1;
+Table	Create Table
+t1	CREATE TABLE `t1` (
+  `ID` int(11) NOT NULL,
+  `type` int(11) DEFAULT NULL
+) ENGINE=MyISAM DEFAULT CHARSET=latin1
+ PARTITION BY RANGE (`ID`)
+SUBPARTITION BY HASH (`type`)
+(PARTITION `p01` VALUES LESS THAN (100)
+ (SUBPARTITION `s11` DATA DIRECTORY = 'MYSQLTEST_VARDIR/tmp' INDEX DIRECTORY = 'MYSQLTEST_VARDIR/tmp' ENGINE = MyISAM,
+  SUBPARTITION `s12` DATA DIRECTORY = 'MYSQLTEST_VARDIR/tmp' INDEX DIRECTORY = 'MYSQLTEST_VARDIR/tmp' ENGINE = MyISAM),
+ PARTITION `p11` VALUES LESS THAN (200)
+ (SUBPARTITION `s21` ENGINE = MyISAM,
+  SUBPARTITION `s22` ENGINE = MyISAM),
+ PARTITION `p21` VALUES LESS THAN MAXVALUE
+ (SUBPARTITION `s31` DATA DIRECTORY = 'MYSQLTEST_VARDIR/tmp' INDEX DIRECTORY = 'MYSQLTEST_VARDIR/tmp' ENGINE = MyISAM,
+  SUBPARTITION `s32` DATA DIRECTORY = 'MYSQLTEST_VARDIR/tmp' INDEX DIRECTORY = 'MYSQLTEST_VARDIR/tmp' ENGINE = MyISAM))
+SHOW CREATE TABLE t2;
+Table	Create Table
+t2	CREATE TABLE `t2` (
+  `ID` int(11) NOT NULL,
+  `type` int(11) DEFAULT NULL
+) ENGINE=MyISAM DEFAULT CHARSET=latin1
+ PARTITION BY RANGE (`ID`)
+SUBPARTITION BY HASH (`type`)
+(PARTITION `p01` VALUES LESS THAN (100)
+ (SUBPARTITION `s11` ENGINE = MyISAM,
+  SUBPARTITION `s12` ENGINE = MyISAM),
+ PARTITION `p11` VALUES LESS THAN (200)
+ (SUBPARTITION `s21` ENGINE = MyISAM,
+  SUBPARTITION `s22` ENGINE = MyISAM),
+ PARTITION `p21` VALUES LESS THAN MAXVALUE
+ (SUBPARTITION `s31` ENGINE = MyISAM,
+  SUBPARTITION `s32` ENGINE = MyISAM))
+DROP TABLE t1, t2;

mysql-test/t/partition_symlink.test

@@ -220,3 +220,58 @@ ENGINE = MyISAM
 partition by key (a)
 (partition p0,
  partition p1 DATA DIRECTORY 'part-data' INDEX DIRECTORY 'part-data');
+
+--echo #
+--echo # MDEV-25917 create table like fails if source table is partitioned and engine is myisam or aria with data directory.
+--echo #
+--replace_result $MYSQLTEST_VARDIR MYSQLTEST_VARDIR
+eval CREATE TABLE t1 (a INT)
+ENGINE = MyISAM
+PARTITION BY LIST (a)
+(PARTITION p0 VALUES IN (0)
+  DATA DIRECTORY '$MYSQLTEST_VARDIR/tmp'
+  INDEX DIRECTORY '$MYSQLTEST_VARDIR/tmp',
+ PARTITION p1 VALUES IN (1)
+  DATA DIRECTORY '$MYSQLTEST_VARDIR/tmp'
+  INDEX DIRECTORY '$MYSQLTEST_VARDIR/tmp',
+ PARTITION p2 VALUES IN (2));
+
+CREATE TABLE t2 LIKE t1;
+--replace_result $MYSQLTEST_VARDIR MYSQLTEST_VARDIR
+SHOW CREATE TABLE t1;
+SHOW CREATE TABLE t2;
+DROP TABLE t1, t2;
+
+--replace_result $MYSQLTEST_VARDIR MYSQLTEST_VARDIR
+eval CREATE TABLE t1 (
+    ID int(11) NOT NULL,
+    type int(11)) Engine=MyISAM
+PARTITION BY RANGE(ID)
+SUBPARTITION BY HASH(type)
+(
+    PARTITION p01 VALUES LESS THAN(100)
+      (SUBPARTITION s11
+           DATA DIRECTORY '$MYSQLTEST_VARDIR/tmp'
+           INDEX DIRECTORY '$MYSQLTEST_VARDIR/tmp',
+       SUBPARTITION s12
+           DATA DIRECTORY '$MYSQLTEST_VARDIR/tmp'
+           INDEX DIRECTORY '$MYSQLTEST_VARDIR/tmp'
+      ),
+    PARTITION p11 VALUES LESS THAN(200)
+      (SUBPARTITION s21, SUBPARTITION s22),
+    PARTITION p21 VALUES LESS THAN MAXVALUE
+      (SUBPARTITION s31
+           DATA DIRECTORY '$MYSQLTEST_VARDIR/tmp'
+           INDEX DIRECTORY '$MYSQLTEST_VARDIR/tmp',
+       SUBPARTITION s32
+           DATA DIRECTORY '$MYSQLTEST_VARDIR/tmp'
+           INDEX DIRECTORY '$MYSQLTEST_VARDIR/tmp'
+      )
+);
+
+CREATE TABLE t2 LIKE t1;
+--replace_result $MYSQLTEST_VARDIR MYSQLTEST_VARDIR
+SHOW CREATE TABLE t1;
+SHOW CREATE TABLE t2;
+
+DROP TABLE t1, t2;

sql/partition_element.h

@@ -132,7 +132,9 @@ public:
     connect_string(null_lex_str),
     part_state(part_elem->part_state),
     nodegroup_id(part_elem->nodegroup_id),
-    has_null_value(FALSE)
+    has_null_value(FALSE),
+    signed_flag(part_elem->signed_flag),
+    max_value(part_elem->max_value)
   {
   }
   ~partition_element() {}

sql/partition_info.cc

@@ -35,7 +35,7 @@
 #include "ha_partition.h"
 
 
-partition_info *partition_info::get_clone(THD *thd)
+partition_info *partition_info::get_clone(THD *thd, bool empty_data_and_index_file)
 {
   MEM_ROOT *mem_root= thd->mem_root;
   DBUG_ENTER("partition_info::get_clone");
@@ -57,25 +57,28 @@ partition_info *partition_info::get_clone(THD *thd)
   {
     List_iterator<partition_element> subpart_it(part->subpartitions);
     partition_element *subpart;
-    partition_element *part_clone= new (mem_root) partition_element();
+    partition_element *part_clone= new (mem_root) partition_element(*part);
     if (!part_clone)
     {
       mem_alloc_error(sizeof(partition_element));
       DBUG_RETURN(NULL);
     }
-    *part_clone= *part;
     part_clone->subpartitions.empty();
     while ((subpart= (subpart_it++)))
     {
-      partition_element *subpart_clone= new (mem_root) partition_element();
+      partition_element *subpart_clone= new (mem_root) partition_element(*subpart);
       if (!subpart_clone)
       {
         mem_alloc_error(sizeof(partition_element));
         DBUG_RETURN(NULL);
       }
-      *subpart_clone= *subpart;
+      if (empty_data_and_index_file)
+        subpart_clone->data_file_name= subpart_clone->index_file_name= NULL;
       part_clone->subpartitions.push_back(subpart_clone, mem_root);
     }
+
+    if (empty_data_and_index_file)
+      part_clone->data_file_name= part_clone->index_file_name= NULL;
     clone->partitions.push_back(part_clone, mem_root);
     part_clone->list_val_list.empty();
     List_iterator<part_elem_value> list_val_it(part->list_val_list);

sql/partition_info.h

@@ -281,7 +281,7 @@ public:
   }
   ~partition_info() {}
 
-  partition_info *get_clone(THD *thd);
+  partition_info *get_clone(THD *thd, bool empty_data_and_index_file= FALSE);
   bool set_named_partition_bitmap(const char *part_name, uint length);
   bool set_partition_bitmaps(TABLE_LIST *table_list);
   /* Answers the question if subpartitioning is used for a certain table */

sql/sql_table.cc

@@ -5547,8 +5547,15 @@ bool mysql_create_like_table(THD* thd, TABLE_LIST* table,
 #ifdef WITH_PARTITION_STORAGE_ENGINE
   /* Partition info is not handled by mysql_prepare_alter_table() call. */
   if (src_table->table->part_info)
-    thd->work_part_info= src_table->table->part_info->get_clone(thd);
+  {
-#endif
+    /*
+      The CREATE TABLE LIKE should not inherit the DATA DIRECTORY
+      and INDEX DIRECTORY from the base table.
+      So that TRUE argument for the get_clone.
+    */
+    thd->work_part_info= src_table->table->part_info->get_clone(thd, TRUE);
+  }
+#endif /*WITH_PARTITION_STORAGE_ENGINE*/
 
   /*
     Adjust description of source table before using it for creation of