Revert MDEV-29566

This reverts commit bdc5548c
that introduced a work-around to ha_innobase::delete_table()
for avoiding failures when trying to remove table partitions.

This work-around (of not removing statistics in case of a locking
conflict) would occasionally cause a failure of the test
parts.part_supported_sql_func_innodb:

mysqltest: In included file "./suite/parts/inc/partition_supported_sql_funcs.inc":
included from ./suite/parts/inc/part_supported_sql_funcs_main.inc at line 91:
included from /buildbot/amd64-ubuntu-2004-msan/build/mysql-test/suite/parts/t/part_supported_sql_func_innodb.test at line 44:
At line 234: query 'alter table t66
reorganize partition s1 into
(partition p0 values less than ($valsqlfunc),
partition p1 values less than maxvalue)' failed: ER_DUP_KEY (1022): Can't write; duplicate key in table 'mysql.innodb_table_stats'

mysql-test/suite/innodb/r/innodb_stats_drop_locked.result

@@ -2,8 +2,6 @@ CREATE DATABASE unlocked;
 CREATE TABLE unlocked.t1(a INT PRIMARY KEY) ENGINE=INNODB STATS_PERSISTENT=0;
 CREATE DATABASE locked;
 CREATE TABLE locked.t1(a INT PRIMARY KEY) ENGINE=INNODB STATS_PERSISTENT=1;
-CREATE TABLE locked.t1p(pk INT PRIMARY KEY) ENGINE=InnoDB STATS_PERSISTENT=1
-PARTITION BY HASH (pk) PARTITIONS 4;
 CREATE TABLE innodb_stats_drop_locked (c INT, KEY c_key (c))
 ENGINE=INNODB STATS_PERSISTENT=1;
 ANALYZE TABLE innodb_stats_drop_locked;
@@ -40,25 +38,12 @@ innodb_stats_drop_locked	CREATE TABLE `innodb_stats_drop_locked` (
 DROP TABLE innodb_stats_drop_locked;
 ERROR HY000: Lock wait timeout exceeded; try restarting transaction
 DROP DATABASE unlocked;
-DROP TABLE locked.t1p;
-SELECT * FROM locked.t1p;
-ERROR 42S02: Table 'locked.t1p' doesn't exist
 DROP DATABASE locked;
 ERROR HY000: Lock wait timeout exceeded; try restarting transaction
 disconnect con1;
 connection default;
 COMMIT;
-SELECT COUNT(*) FROM mysql.innodb_table_stats WHERE database_name='locked';
-COUNT(*)
-5
-SELECT COUNT(*) FROM mysql.innodb_index_stats WHERE database_name='locked';
-COUNT(*)
-15
 DROP DATABASE locked;
-SELECT table_name FROM mysql.innodb_table_stats WHERE database_name='locked';
-table_name
-SELECT table_name FROM mysql.innodb_index_stats WHERE database_name='locked';
-table_name
 SELECT table_name FROM mysql.innodb_table_stats
 WHERE table_name='innodb_stats_drop_locked';
 table_name

mysql-test/suite/innodb/t/innodb_stats_drop_locked.test

@@ -4,16 +4,12 @@
 #
 
 -- source include/have_innodb.inc
--- source include/have_partition.inc
 
 CREATE DATABASE unlocked;
 CREATE TABLE unlocked.t1(a INT PRIMARY KEY) ENGINE=INNODB STATS_PERSISTENT=0;
 CREATE DATABASE locked;
 CREATE TABLE locked.t1(a INT PRIMARY KEY) ENGINE=INNODB STATS_PERSISTENT=1;
 
-CREATE TABLE locked.t1p(pk INT PRIMARY KEY) ENGINE=InnoDB STATS_PERSISTENT=1
-PARTITION BY HASH (pk) PARTITIONS 4;
-
 CREATE TABLE innodb_stats_drop_locked (c INT, KEY c_key (c))
 ENGINE=INNODB STATS_PERSISTENT=1;
 ANALYZE TABLE innodb_stats_drop_locked;
@@ -39,26 +35,14 @@ SHOW CREATE TABLE innodb_stats_drop_locked;
 DROP TABLE innodb_stats_drop_locked;
 
 DROP DATABASE unlocked;
-
-# Partitions will always be dropped despite locking conflicts.
-DROP TABLE locked.t1p;
---error ER_NO_SUCH_TABLE
-SELECT * FROM locked.t1p;
-
 --error ER_LOCK_WAIT_TIMEOUT
 DROP DATABASE locked;
 -- disconnect con1
 -- connection default
 COMMIT;
 
-SELECT COUNT(*) FROM mysql.innodb_table_stats WHERE database_name='locked';
-SELECT COUNT(*) FROM mysql.innodb_index_stats WHERE database_name='locked';
-
 DROP DATABASE locked;
 
-SELECT table_name FROM mysql.innodb_table_stats WHERE database_name='locked';
-SELECT table_name FROM mysql.innodb_index_stats WHERE database_name='locked';
-
 # the stats should be there
 
 SELECT table_name FROM mysql.innodb_table_stats

storage/innobase/handler/ha_innodb.cc

@@ -13613,8 +13613,7 @@ int ha_innobase::delete_table(const char *name)
       dict_sys.unfreeze();
     }
 
-    const bool skip_wait{table->name.is_temporary() ||
-                         dict_table_is_partition(table)};
+    const bool skip_wait{table->name.is_temporary()};
 
     if (table_stats && index_stats &&
         !strcmp(table_stats->name.m_name, TABLE_STATS_NAME) &&