Post-merge fixes

mysql-test/r/type_decimal.result

@@ -811,6 +811,7 @@ insert into t1 values (-0.123456,0.123456);
 select group_concat(f1),group_concat(f2) from t1;
 group_concat(f1)	group_concat(f2)
 -0.123456	0.123456
+drop table t1;
 create table t1 (
 ua_id decimal(22,0) not null,
 ua_invited_by_id decimal(22,0) default NULL,

mysql-test/t/type_decimal.test

@@ -425,5 +425,20 @@ insert into t1 values (-0.123456,0.123456);
 select group_concat(f1),group_concat(f2) from t1;
 drop table t1;
 
+#
+# BUG#31450 "Query causes error 1048"
+#
+create table t1 (
+  ua_id decimal(22,0) not null,
+  ua_invited_by_id decimal(22,0) default NULL,
+  primary key(ua_id)
+);
+insert into t1 values (123, NULL), (456, NULL);
+
+--echo this must not produce error 1048: 
+select * from t1 where ua_invited_by_id not in (select ua_id from t1);
+
+drop table t1;
+
 --echo End of 5.0 tests