MDEV-25002 ON expressions cannot contain outer references

A bogus error message was issued for any outer references occurred in
ON expressions used in subqueries. This prevented execution of queries
containing subqueries as soon as they used outer references in their ON
clauses. This happened because the Name_resolution_context structure
created for any ON expression erroneously had the field outer_context set
to NULL. The fields select_lex of this structure was not set correctly
either.

The idea of the fix was taken from mysql code of the function
push_new_name_resolution_context().

Approved by dmitry.shulga@mariadb.com

1 files changed, 38 insertions, 0 deletions

diff --git a/mysql-test/r/subselect.result b/mysql-test/r/subselect.result
index d4d61eb4247..a03a2cff207 100644
--- a/mysql-test/r/subselect.result
+++ b/mysql-test/r/subselect.result
@@ -7331,4 +7331,42 @@ WHERE (t2.i, t2.pk) NOT IN ( SELECT t3.i, t3.i FROM t t3, t t4 ) AND t1.c = 'foo
 pk	i	c	pk	i	c
 1	10	foo	1	10	foo
 DROP TABLE t;
+#
+# MDEV-25002: Outer reference in ON clause of subselect
+#
+create table t1 (
+pk int primary key,
+a int
+) engine=myisam;
+insert into t1 values (1,1), (2,2);
+create table t2 (
+pk int primary key,
+b int
+) engine=myisam;
+insert into t2 values (1,1), (2,3);
+create table t3 (a int);
+insert into t3 values (1),(2);
+select a,
+(select count(*) from t1, t2
+where t2.pk=t3.a and t1.pk=1) as sq
+from t3;
+a	sq
+1	1
+2	1
+select a,
+(select count(*) from t1 join t2 on t2.pk=t3.a
+where t1.pk=1) as sq
+from t3;
+a	sq
+1	1
+2	1
+select a from t3
+where a in (select t2.b from t1,t2 where t2.pk=t3.a and t1.pk=1);
+a
+1
+select a from t3
+where a in (select t2.b from t1 join t2 on t2.pk=t3.a where t1.pk=1);
+a
+1
+drop table t1,t2,t3;
 # End of 10.2 tests