A Java function that returns a result set that was generated using the provided…

A Java function that returns a result set that was generated using the provided connection could cause an internal error in some cases. Now such result sets are copied early on.

h2/src/main/org/h2/value/DataType.java

@@ -898,7 +898,7 @@ public class DataType {
             if (x instanceof SimpleResultSet) {
                 return ValueResultSet.get((ResultSet) x);
             }
-            return ValueResultSet.getCopy((ResultSet) x, 0);
+            return ValueResultSet.getCopy((ResultSet) x, Integer.MAX_VALUE);
         } else if (x instanceof UUID) {
             UUID u = (UUID) x;
             return ValueUuid.get(u.getMostSignificantBits(), u.getLeastSignificantBits());

h2/src/main/org/h2/value/ValueResultSet.java

@@ -114,7 +114,7 @@ public class ValueResultSet extends Value {
     }
 
     protected int compareSecure(Value v, CompareMode mode) {
-        throw throwUnsupportedExceptionForType("<=>");
+        return this == v ? 0 : super.toString().compareTo(v.toString());
     }
 
     public boolean equals(Object other) {