Removed redundant partitioning check

This check was introduced in 602a2225 and then became redundant in ad1553e,
where we attempt to open a table even for non-copy algorithms.

Added missing test case from 602a2225.

Part of MDEV-17805 - Remove InnoDB cache for temporary tables.

mysql-test/main/partition_innodb.result

@@ -580,6 +580,33 @@ DROP TABLE t1;
 # Bug#57985 "ONLINE/FAST ALTER PARTITION can fail and leave the
 #            table unusable".
 #
+CREATE TABLE t1 (a bigint not null, b int not null, PRIMARY KEY (a))
+ENGINE = InnoDB PARTITION BY KEY(a) PARTITIONS 2;
+INSERT INTO t1 values (0,1), (1,2);
+# The below ALTER should fail. It should leave the
+# table in its original, non-corrupted, usable state.
+ALTER TABLE t1 ADD UNIQUE KEY (b);
+ERROR HY000: A UNIQUE INDEX must include all columns in the table's partitioning function
+# The below statements should succeed, as ALTER should
+# have left table intact.
+SHOW CREATE TABLE t1;
+Table	Create Table
+t1	CREATE TABLE `t1` (
+  `a` bigint(20) NOT NULL,
+  `b` int(11) NOT NULL,
+  PRIMARY KEY (`a`)
+) ENGINE=InnoDB DEFAULT CHARSET=latin1
+ PARTITION BY KEY (`a`)
+PARTITIONS 2
+SELECT * FROM t1;
+a	b
+1	2
+0	1
+DROP TABLE t1;
+#
+# Bug#57985 "ONLINE/FAST ALTER PARTITION can fail and leave the
+#            table unusable".
+#
 DROP TABLE IF EXISTS t1;
 CREATE TABLE t1 (a bigint not null, b int not null, PRIMARY KEY (a))
 ENGINE = InnoDB PARTITION BY KEY(a) PARTITIONS 2;

mysql-test/main/partition_innodb.test

@@ -665,6 +665,25 @@ OPTIMIZE TABLE t1;
 SET SESSION sql_mode = @old_mode;
 DROP TABLE t1;
 
+
+--echo #
+--echo # Bug#57985 "ONLINE/FAST ALTER PARTITION can fail and leave the
+--echo #            table unusable".
+--echo #
+CREATE TABLE t1 (a bigint not null, b int not null, PRIMARY KEY (a))
+  ENGINE = InnoDB PARTITION BY KEY(a) PARTITIONS 2;
+INSERT INTO t1 values (0,1), (1,2);
+--echo # The below ALTER should fail. It should leave the
+--echo # table in its original, non-corrupted, usable state.
+--error ER_UNIQUE_KEY_NEED_ALL_FIELDS_IN_PF
+ALTER TABLE t1 ADD UNIQUE KEY (b);
+--echo # The below statements should succeed, as ALTER should
+--echo # have left table intact.
+SHOW CREATE TABLE t1;
+SELECT * FROM t1;
+DROP TABLE t1;
+
+
 --echo #
 --echo # Bug#57985 "ONLINE/FAST ALTER PARTITION can fail and leave the
 --echo #            table unusable".

mysql-test/suite/versioning/r/partition_innodb.result

@@ -20,7 +20,7 @@ alter table t1  partition by system_time (
 partition p0 history,
 partition pn current
 );
-ERROR HY000: `row_start` must be of type TIMESTAMP(6) for system-versioned table `#sql-temporary`
+ERROR HY000: `row_start` must be of type TIMESTAMP(6) for system-versioned table `t1`
 create or replace table t (
 a int primary key,
 row_start bigint unsigned as row start invisible,

mysql-test/suite/versioning/t/partition_innodb.test

@@ -21,7 +21,6 @@ create or replace table t1(
   period for system_time(row_start, row_end)
 ) engine=InnoDB with system versioning;
 
---replace_regex /#sql-[0-9a-f_]*/#sql-temporary/
 --error ER_VERS_FIELD_WRONG_TYPE
 alter table t1  partition by system_time (
   partition p0 history,

sql/sql_table.cc

@@ -5055,43 +5055,7 @@ int create_table_impl(THD *thd, const LEX_CSTRING &orig_db,
     thd->thread_specific_used= TRUE;
     create_info->table= table;                  // Store pointer to table
   }
-#ifdef WITH_PARTITION_STORAGE_ENGINE
-  else if (thd->work_part_info && frm_only)
-  {
-    /*
-      For partitioned tables we can't find some problems with table
-      until table is opened. Therefore in order to disallow creation
-      of corrupted tables we have to try to open table as the part
-      of its creation process.
-      In cases when both .FRM and SE part of table are created table
-      is implicitly open in ha_create_table() call.
-      In cases when we create .FRM without SE part we have to open
-      table explicitly.
-    */
-    TABLE table;
-    TABLE_SHARE share;
-
-    init_tmp_table_share(thd, &share, db.str, 0, table_name.str, path);
-
-    bool result= (open_table_def(thd, &share, GTS_TABLE) ||
-                  open_table_from_share(thd, &share, &empty_clex_str, 0,
-                                        (uint) READ_ALL, 0, &table, true));
-    if (!result)
-      (void) closefrm(&table);
 
-    free_table_share(&share);
-
-    if (result)
-    {
-      char frm_name[FN_REFLEN];
-      strxnmov(frm_name, sizeof(frm_name), path, reg_ext, NullS);
-      (void) mysql_file_delete(key_file_frm, frm_name, MYF(0));
-      (void) file->ha_create_partitioning_metadata(path, NULL, CHF_DELETE_FLAG);
-      goto err;
-    }
-  }
-#endif
-  
   error= 0;
 err:
   THD_STAGE_INFO(thd, stage_after_create);