MDEV-18057 Assertion `(node->state == 5) || (node->state == 6)' failed in...

MDEV-18057 Assertion `(node->state == 5) || (node->state == 6)' failed in row_upd_sec_step upon DELETE after UPDATE failed due to FK violation

The idea of the fix: reset state from previous query.

row_upd_clust_step(): reset cached index before updating a clustered index

Closes #1133

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

@@ -290,3 +290,12 @@ select count(*) from subchild;
 count(*)
 0
 drop table subchild, child, parent;
+CREATE TABLE t1 (f1 INT, KEY(f1)) ENGINE=InnoDB;
+CREATE TABLE t2 (f2 INT, FOREIGN KEY (f2) REFERENCES t1 (f1)) ENGINE=InnoDB WITH SYSTEM VERSIONING;
+SET FOREIGN_KEY_CHECKS= OFF;
+INSERT IGNORE INTO t2 VALUES (1);
+SET FOREIGN_KEY_CHECKS= ON;
+UPDATE t2 SET f2= 2;
+ERROR 23000: Cannot add or update a child row: a foreign key constraint fails (`test`.`t2`, CONSTRAINT `t2_ibfk_1` FOREIGN KEY (`f2`) REFERENCES `t1` (`f1`))
+DELETE FROM t2;
+DROP TABLE t2, t1;

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

@@ -317,4 +317,18 @@ select count(*) from subchild;
 drop table subchild, child, parent;
 
 
+CREATE TABLE t1 (f1 INT, KEY(f1)) ENGINE=InnoDB;
+CREATE TABLE t2 (f2 INT, FOREIGN KEY (f2) REFERENCES t1 (f1)) ENGINE=InnoDB WITH SYSTEM VERSIONING;
+
+SET FOREIGN_KEY_CHECKS= OFF;
+INSERT IGNORE INTO t2 VALUES (1);
+
+SET FOREIGN_KEY_CHECKS= ON;
+--error ER_NO_REFERENCED_ROW_2
+UPDATE t2 SET f2= 2;
+DELETE FROM t2;
+
+DROP TABLE t2, t1;
+
+
 --source suite/versioning/common_finish.inc

storage/innobase/row/row0upd.cc

@@ -3200,6 +3200,7 @@ row_upd_clust_step(
 
 	if (node->cmpl_info & UPD_NODE_NO_ORD_CHANGE) {
 
+		node->index = NULL;
 		err = row_upd_clust_rec(
 			flags, node, index, offsets, &heap, thr, &mtr);
 		goto exit_func;