Bug #26334149 - MYSQL CRASHES WHEN FULL TEXT INDEXES IBD FILES ARE ORPHANED DUE TO RENAME TABLE

Problem:
When FTS index is added into a table which doesn't have 'FTS_DOC_ID'
column, Innodb rebuilds table to add column 'FTS_DOC_ID'. when this FTS
index is dropped from this table. Innodb doesn't not rebuild table to
remove 'FTS_DOC_ID' column and deletes FTS index auxiliary tables.
But it doesn't delete FTS common auxiliary tables.
Later when the database having this table is renamed, FTS auxiliary
tables are not renamed because table's flags2 (dict_table_t.flags2)
has been resetted for DICT_TF2_FTS flag during FTS index drop operation.
Now when we drop old database, it leads to an assert.

Fix:
During renaming of FTS auxiliary tables, ORed a condition to check if
table has DICT_TF2_FTS_HAS_DOC_ID flag set.

RB: 18769
Reviewed by : Jimmy.Yang@oracle.com

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

@@ -859,3 +859,32 @@ DROP TABLE dest_db.t1;
 DROP TABLE source_db.t1;
 DROP DATABASE source_db;
 DROP DATABASE dest_db;
+#
+# BUG #26334149 MYSQL CRASHES WHEN FULL TEXT INDEXES IBD FILES ARE
+# ORPHANED DUE TO RENAME TABLE
+#
+CREATE DATABASE db1;
+USE db1;
+CREATE TABLE notes (
+id int(11) NOT NULL AUTO_INCREMENT,
+body text COLLATE utf8_unicode_ci,
+PRIMARY KEY (id)
+) ENGINE=InnoDB AUTO_INCREMENT=1 DEFAULT CHARSET=utf8
+COLLATE=utf8_unicode_ci
+ROW_FORMAT=COMPRESSED;
+Warnings:
+Warning	1478	InnoDB: ROW_FORMAT=COMPRESSED requires innodb_file_format > Antelope.
+Warning	1478	InnoDB: assuming ROW_FORMAT=COMPACT.
+ALTER TABLE notes ADD FULLTEXT INDEX index_ft_body (body(255));
+Warnings:
+Warning	1478	InnoDB: ROW_FORMAT=COMPRESSED requires innodb_file_format > Antelope.
+Warning	1478	InnoDB: assuming ROW_FORMAT=COMPACT.
+Warning	124	InnoDB rebuilding table to add column FTS_DOC_ID
+DROP INDEX index_ft_body ON notes;
+Warnings:
+Warning	1478	InnoDB: ROW_FORMAT=COMPRESSED requires innodb_file_format > Antelope.
+Warning	1478	InnoDB: assuming ROW_FORMAT=COMPACT.
+CREATE DATABASE db2;
+RENAME TABLE db1.notes TO db2.notes;
+DROP DATABASE db1;
+DROP DATABASE db2;

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

@@ -481,3 +481,24 @@ eval ALTER TABLE $source_db.t1 DROP INDEX index2, algorithm=inplace;
 eval DROP TABLE $source_db.t1;
 eval DROP DATABASE $source_db;
 eval DROP DATABASE $dest_db;
+
+--echo #
+--echo # BUG #26334149 MYSQL CRASHES WHEN FULL TEXT INDEXES IBD FILES ARE
+--echo # ORPHANED DUE TO RENAME TABLE
+--echo #
+CREATE DATABASE db1; USE db1;
+CREATE TABLE notes (
+   id int(11) NOT NULL AUTO_INCREMENT,
+   body text COLLATE utf8_unicode_ci,
+   PRIMARY KEY (id)
+   ) ENGINE=InnoDB AUTO_INCREMENT=1 DEFAULT CHARSET=utf8
+COLLATE=utf8_unicode_ci
+ROW_FORMAT=COMPRESSED;
+
+ALTER TABLE notes ADD FULLTEXT INDEX index_ft_body (body(255));
+DROP INDEX index_ft_body ON notes;
+
+CREATE DATABASE db2;
+RENAME TABLE db1.notes TO db2.notes;
+DROP DATABASE db1;
+DROP DATABASE db2;

storage/xtradb/row/row0mysql.cc

 /*****************************************************************************
 
-Copyright (c) 2000, 2017, Oracle and/or its affiliates. All Rights Reserved.
+Copyright (c) 2000, 2018, Oracle and/or its affiliates. All Rights Reserved.
 Copyright (c) 2017, 2018, MariaDB Corporation.
 
 This program is free software; you can redistribute it and/or modify it under
@@ -5168,7 +5168,8 @@ row_rename_table_for_mysql(
 		}
 	}
 
-	if (dict_table_has_fts_index(table)
+	if ((dict_table_has_fts_index(table)
+	    || DICT_TF2_FLAG_IS_SET(table, DICT_TF2_FTS_HAS_DOC_ID))
 	    && !dict_tables_have_same_db(old_name, new_name)) {
 		err = fts_rename_aux_tables(table, new_name, trx);
 		if (err != DB_TABLE_NOT_FOUND) {