Remove unexpected assertion, null is valid here

h2/src/main/org/h2/index/ViewIndex.java

@@ -168,7 +168,6 @@ public class ViewIndex extends BaseIndex implements SpatialIndex {
 
     private static Query prepareSubQuery(String sql, Session session, int[] masks,
             TableFilter[] filters, int filter, SortOrder sortOrder) {
-        assert filters != null;
         Prepared p;
         session.pushSubQueryInfo(masks, filters, filter, sortOrder);
         try {

h2/src/test/org/h2/test/scripts/joins.sql

@@ -103,6 +103,21 @@ select a.i from t1 a inner join (select a.i from t2 a inner join (select i from
 > -
 > rows: 0
 
+insert into t1 values (1);
+> update count: 1
+
+insert into t2 values (1);
+> update count: 1
+
+insert into t3 values (1);
+> update count: 1
+
+select a.i from t1 a inner join (select a.i from t2 a inner join (select i from t3) b on a.i=b.i) b on a.i=b.i;
+> I
+> -
+> 1
+> rows: 1
+
 drop table t1, t2, t3;
 > ok