1 files changed, 13 insertions, 0 deletions
diff --git a/mysql-test/suite/innodb/r/add_constraint.result b/mysql-test/suite/innodb/r/add_constraint.result
new file mode 100644
index 00000000..9d894e53
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+++ b/mysql-test/suite/innodb/r/add_constraint.result
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+#
+# Bug #20762798 FK DDL: CRASH IN DICT_FOREIGN_REMOVE_FROM_CACHE
+#
+create table t1(a int, b int, key(a),key(b))engine=innodb;
+create table t2(a int, b int, key(a),key(b))engine=innodb;
+alter table t2 add constraint b foreign key (b) references t1(a);
+alter table t1 add constraint b1 foreign key (b) references t2(a);
+alter table t2 add constraint b1 foreign key (b) references t1(a);
+ERROR HY000: Can't create table `test`.`t2` (errno: 121 "Duplicate key on write or update")
+alter table t2 drop foreign key b;
+alter table t1 drop foreign key b1;
+drop table t2;
+drop table t1;