Fix ValueInterval.compareTypeSafe()

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

@@ -225,11 +225,14 @@ public class ValueInterval extends Value {
     @Override
     public int compareTypeSafe(Value v, CompareMode mode) {
         ValueInterval other = (ValueInterval) v;
+        if (negative != other.negative) {
+            return negative ? -1 : 1;
+        }
         int cmp = Long.compare(leading, other.leading);
         if (cmp == 0) {
             cmp = Long.compare(remaining, other.remaining);
         }
-        return cmp;
+        return negative ? -cmp : cmp;
     }
 
     @Override

h2/src/test/org/h2/test/scripts/datatypes/interval.sql

@@ -701,3 +701,24 @@ SELECT TIMESTAMP '2010-01-15 12:00:00.5+01' - TIMESTAMP WITH TIME ZONE '2010-01-
 
 SELECT TIMESTAMP WITH TIME ZONE '2010-01-15 12:00:00.5+01' - TIMESTAMP '2010-01-13 01:30:00+02';
 >> INTERVAL '2 11:30:00.5' DAY TO SECOND
+
+CREATE TABLE TEST(I INTERVAL YEAR TO MONTH);
+> ok
+
+INSERT INTO TEST VALUES ('-0-0'), ('-0-1'), ('-1-1'), ('1-0'), ('0-1'), ('1-1'), ('-1-0');
+> update count: 7
+
+SELECT * FROM TEST ORDER BY I;
+> I
+> -----------------------------
+> INTERVAL '-1-1' YEAR TO MONTH
+> INTERVAL '-1-0' YEAR TO MONTH
+> INTERVAL '-0-1' YEAR TO MONTH
+> INTERVAL '0-0' YEAR TO MONTH
+> INTERVAL '0-1' YEAR TO MONTH
+> INTERVAL '1-0' YEAR TO MONTH
+> INTERVAL '1-1' YEAR TO MONTH
+> rows (ordered): 7
+
+DROP TABLE TEST;
+> ok