"group_concat(distinct ...)" did not work correctly in a view or subquery (the…

"group_concat(distinct ...)" did not work correctly in a view or subquery (the 'distinct' was lost). Example: select * from (select group_concat(distinct 1) from system_range(1, 3));

h2/src/main/org/h2/expression/Aggregate.java

@@ -462,6 +462,9 @@ public class Aggregate extends Expression {
 
     private String getSQLGroupConcat() {
         StatementBuilder buff = new StatementBuilder("GROUP_CONCAT(");
+        if (distinct) {
+            buff.append("DISTINCT ");
+        }
         buff.append(on.getSQL());
         if (orderList != null) {
             buff.append(" ORDER BY ");

h2/src/test/org/h2/test/testSimple.in.txt

+select * from (select group_concat(distinct 1) from system_range(1, 3));
+> 1;
 select sum(mod(x, 2) = 1) from system_range(1, 10);
 > 5;
 create table a(x int);