MDEV-18867 Long Time to Stop and Start

fts_drop_orphaned_tables() takes long time to remove the orphaned
FTS tables. In order to reduce the time, do the following:

- Traverse fil_system.space_list and construct a set of
table_id,index_id of all FTS_*.ibd tablespaces.
- Traverse the sys_indexes table and ignore the entry
from the above collection if it exist.
- Existing elements in the collection can be considered as
orphaned fts tables. construct the table name from
(table_id,index_id) and invoke fts_drop_tables().
- Removed DICT_TF2_FTS_AUX_HEX_NAME flag usage from upgrade.
- is_aux_table() in dict_table_t to check whether the given name
is fts auxiliary table
fts_space_set_t is a structure to store set of parent table id
and index id
- Remove unused FTS function in fts0fts.cc
- Remove the fulltext index in row_format_redundant test case.
Because it deals with the condition that SYS_TABLES does have
corrupted entry and valid entry exist in SYS_INDEXES.

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

@@ -5,8 +5,7 @@ SET GLOBAL innodb_file_per_table=1;
 #
 SET GLOBAL innodb_file_per_table=ON;
 create table t1 (a int not null, d varchar(15) not null, b
-varchar(198) not null, c char(156),
-fulltext ftsic(c)) engine=InnoDB
+varchar(198) not null, c char(156)) engine=InnoDB
 row_format=redundant;
 insert into t1 values(123, 'abcdef', 'jghikl', 'mnop');
 insert into t1 values(456, 'abcdef', 'jghikl', 'mnop');
@@ -72,7 +71,7 @@ DROP TABLE t1;
 Warnings:
 Warning	1932	Table 'test.t1' doesn't exist in engine
 DROP TABLE t2,t3;
-FOUND 50 /\[ERROR\] InnoDB: Table `test`\.`t1` in InnoDB data dictionary contains invalid flags\. SYS_TABLES\.TYPE=1 SYS_TABLES\.MIX_LEN=255\b/ in mysqld.1.err
+FOUND 6 /\[ERROR\] InnoDB: Table `test`\.`t1` in InnoDB data dictionary contains invalid flags\. SYS_TABLES\.TYPE=1 SYS_TABLES\.MIX_LEN=255\b/ in mysqld.1.err
 ib_buffer_pool
 ib_logfile0
 ib_logfile1

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

@@ -32,8 +32,7 @@ SET GLOBAL innodb_file_per_table=1;
 
 SET GLOBAL innodb_file_per_table=ON;
 create table t1 (a int not null, d varchar(15) not null, b
-varchar(198) not null, c char(156),
-fulltext ftsic(c)) engine=InnoDB
+varchar(198) not null, c char(156)) engine=InnoDB
 row_format=redundant;
 
 insert into t1 values(123, 'abcdef', 'jghikl', 'mnop');

storage/innobase/fil/fil0fil.cc

@@ -5416,51 +5416,6 @@ fil_delete_file(
 	}
 }
 
-/**
-Iterate over all the spaces in the space list and fetch the
-tablespace names. It will return a copy of the name that must be
-freed by the caller using: delete[].
-@return DB_SUCCESS if all OK. */
-dberr_t
-fil_get_space_names(
-/*================*/
-	space_name_list_t&	space_name_list)
-				/*!< in/out: List to append to */
-{
-	fil_space_t*	space;
-	dberr_t		err = DB_SUCCESS;
-
-	mutex_enter(&fil_system->mutex);
-
-	for (space = UT_LIST_GET_FIRST(fil_system->space_list);
-	     space != NULL;
-	     space = UT_LIST_GET_NEXT(space_list, space)) {
-
-		if (space->purpose == FIL_TYPE_TABLESPACE) {
-			ulint	len;
-			char*	name;
-
-			len = ::strlen(space->name);
-			name = UT_NEW_ARRAY_NOKEY(char, len + 1);
-
-			if (name == 0) {
-				/* Caller to free elements allocated so far. */
-				err = DB_OUT_OF_MEMORY;
-				break;
-			}
-
-			memcpy(name, space->name, len);
-			name[len] = 0;
-
-			space_name_list.push_back(name);
-		}
-	}
-
-	mutex_exit(&fil_system->mutex);
-
-	return(err);
-}
-
 /** Generate redo log for swapping two .ibd files
 @param[in]	old_table	old table
 @param[in]	new_table	new table

storage/innobase/fts/fts0config.cc

@@ -148,9 +148,7 @@ fts_config_create_index_param_name(
 	::strcpy(name, param);
 	name[len] = '_';
 
-	fts_write_object_id(index->id, name + len + 1,
-			    DICT_TF2_FLAG_IS_SET(index->table,
-						 DICT_TF2_FTS_AUX_HEX_NAME));
+	fts_write_object_id(index->id, name + len + 1);
 
 	return(name);
 }