Bug#49477: Assertion `0' failed in ha_partition.cc:5530

with temporary table and partitions

It was possible to create temporary partitioned tables
via create table ... like ... (which is not allowed with
create temporary table). This lead to a new HA_EXTRA flag
(HA_EXTRA_MMAP) was sent to the partitioning handler,
which was caught on an assert in debug builds.

Solution was to check for partitioned tables when
doing create table ... like ... and disallow it.

mysql-test/r/partition_error.result

 drop table if exists t1;
+#
+# Bug#49477: Assertion `0' failed in ha_partition.cc:5530
+# with temporary table and partitions
+#
+CREATE TABLE t1 (a INT) PARTITION BY HASH(a);
+CREATE TEMPORARY TABLE tmp_t1 LIKE t1;
+ERROR HY000: Cannot create temporary table with partitions
+DROP TABLE t1;
 CREATE TABLE t1 (a INTEGER NOT NULL, PRIMARY KEY (a));
 INSERT INTO t1 VALUES (1),(1);
 ERROR 23000: Duplicate entry '1' for key 'PRIMARY'

mysql-test/t/partition_error.test

@@ -8,6 +8,15 @@
 drop table if exists t1;
 --enable_warnings
  
+--echo #
+--echo # Bug#49477: Assertion `0' failed in ha_partition.cc:5530
+--echo # with temporary table and partitions
+--echo #
+CREATE TABLE t1 (a INT) PARTITION BY HASH(a);
+--error ER_PARTITION_NO_TEMPORARY
+CREATE TEMPORARY TABLE tmp_t1 LIKE t1;
+DROP TABLE t1;
+
 #
 # Bug#38719: Partitioning returns a different error code for a
 # duplicate key error

sql/sql_table.cc

@@ -5257,6 +5257,11 @@ bool mysql_create_like_table(THD* thd, TABLE_LIST* table, TABLE_LIST* src_table,
   */
   if (create_info->options & HA_LEX_CREATE_TMP_TABLE)
   {
+    if (src_table->table->file->ht == partition_hton)
+    {
+      my_error(ER_PARTITION_NO_TEMPORARY, MYF(0));
+      goto err;
+    }
     if (find_temporary_table(thd, db, table_name))
       goto table_exists;
     dst_path_length= build_tmptable_filename(thd, dst_path, sizeof(dst_path));
@@ -5321,14 +5326,15 @@ bool mysql_create_like_table(THD* thd, TABLE_LIST* table, TABLE_LIST* src_table,
   /*
     For partitioned tables we need to copy the .par file as well since
     it is used in open_table_def to even be able to create a new handler.
-    There is no way to find out here if the original table is a
-    partitioned table so we copy the file and ignore any errors.
   */
-  fn_format(tmp_path, dst_path, reg_ext, ".par", MYF(MY_REPLACE_EXT));
-  strmov(dst_path, tmp_path);
-  fn_format(tmp_path, src_path, reg_ext, ".par", MYF(MY_REPLACE_EXT));
-  strmov(src_path, tmp_path);
-  my_copy(src_path, dst_path, MYF(MY_DONT_OVERWRITE_FILE));
+  if (src_table->table->file->ht == partition_hton)
+  {
+    fn_format(tmp_path, dst_path, reg_ext, ".par", MYF(MY_REPLACE_EXT));
+    strmov(dst_path, tmp_path);
+    fn_format(tmp_path, src_path, reg_ext, ".par", MYF(MY_REPLACE_EXT));
+    strmov(src_path, tmp_path);
+    my_copy(src_path, dst_path, MYF(MY_DONT_OVERWRITE_FILE));
+  }
 #endif
 
   DBUG_EXECUTE_IF("sleep_create_like_before_ha_create", my_sleep(6000000););