MDEV-32346 Assertion failure sym_node->table != NULL in pars_retrieve_table_def on UPDATE

- During update operation, InnoDB should avoid the initializing
the FTS_DOC_ID of foreign table if the foreign table is discarded

mysql-test/suite/innodb_fts/r/foreign_key_update.result

@@ -32,3 +32,15 @@ database
 database
 DROP TABLE t1_fk;
 DROP TABLE t1;
+#
+# MDEV-32346  Assertion failure sym_node->table != NULL
+#	in pars_retrieve_table_def on UPDATE
+#
+CREATE TABLE t1 (a INT PRIMARY KEY) ENGINE=InnoDB;
+CREATE TABLE t2 (a INT, b TEXT, FOREIGN KEY(a) REFERENCES t1(a),
+FULLTEXT (b))ENGINE=InnoDB;
+INSERT INTO t1 SET a=1;
+ALTER TABLE t2 DISCARD TABLESPACE;
+UPDATE t1 SET a=2;
+ERROR 23000: Cannot delete or update a parent row: a foreign key constraint fails (`test`.`t2`, CONSTRAINT `t2_ibfk_1` FOREIGN KEY (`a`) REFERENCES `t1` (`a`))
+DROP TABLE t2,t1;

mysql-test/suite/innodb_fts/t/foreign_key_update.test

@@ -32,3 +32,16 @@ SELECT * FROM t1_fk WHERE MATCH(a) AGAINST('database');
 
 DROP TABLE t1_fk;
 DROP TABLE t1;
+
+--echo #
+--echo # MDEV-32346  Assertion failure sym_node->table != NULL
+--echo #	in pars_retrieve_table_def on UPDATE
+--echo #
+CREATE TABLE t1 (a INT PRIMARY KEY) ENGINE=InnoDB;
+CREATE TABLE t2 (a INT, b TEXT, FOREIGN KEY(a) REFERENCES t1(a),
+		 FULLTEXT (b))ENGINE=InnoDB;
+INSERT INTO t1 SET a=1;
+ALTER TABLE t2 DISCARD TABLESPACE;
+--error ER_ROW_IS_REFERENCED_2
+UPDATE t1 SET a=2;
+DROP TABLE t2,t1;

storage/innobase/row/row0mysql.cc

@@ -1689,7 +1689,8 @@ init_fts_doc_id_for_ref(
 
 		ut_ad(foreign->foreign_table != NULL);
 
-		if (foreign->foreign_table->fts != NULL) {
+		if (foreign->foreign_table->space
+		    && foreign->foreign_table->fts) {
 			fts_init_doc_id(foreign->foreign_table);
 		}
 

wsrep-lib @ a5d95f01

-Subproject commit 6a17207b7f44379cdcd73d69203c1a37b901c9d3
+Subproject commit a5d95f0175f10b6127ea039c542725f6c4aa5cb9