Just compare what is necessary for equality.

2 files changed, 16 insertions, 3 deletions

diff --git a/document/src/main/java/com/yahoo/document/DataType.java b/document/src/main/java/com/yahoo/document/DataType.java
index abdbf394591..3f34314f0de 100644
--- a/document/src/main/java/com/yahoo/document/DataType.java
+++ b/document/src/main/java/com/yahoo/document/DataType.java
@@ -246,9 +246,7 @@ public abstract class DataType extends Identifiable implements Serializable, Com
     }
 
     public boolean equals(Object other) {
-        if (!(other instanceof DataType)) return false;
-        DataType type = (DataType)other;
-        return (name.equals(type.name) && dataTypeId == type.dataTypeId);
+        return (other instanceof DataType) && (dataTypeId == ((DataType)other).dataTypeId);
     }
 
     public String toString() {
diff --git a/document/src/main/java/com/yahoo/document/ReferenceDataType.java b/document/src/main/java/com/yahoo/document/ReferenceDataType.java
index 5b5ba256f43..32c6f86ea31 100644
--- a/document/src/main/java/com/yahoo/document/ReferenceDataType.java
+++ b/document/src/main/java/com/yahoo/document/ReferenceDataType.java
@@ -98,4 +98,19 @@ public class ReferenceDataType extends DataType {
         ReferenceFieldValue rhs = (ReferenceFieldValue)value;
         return rhs.getDataType().equals(this);
     }
+
+    @Override
+    public int compareTo(DataType rhs) {
+        int cmp = super.compareTo(rhs);
+        return (cmp != 0)
+                ? cmp
+                : (rhs instanceof ReferenceDataType) ? targetType.compareTo(((ReferenceDataType) rhs).targetType) : 0;
+    }
+
+    @Override
+    public boolean equals(Object rhs) {
+        return  super.equals(rhs)
+                && (rhs instanceof ReferenceDataType)
+                && targetType.equals(((ReferenceDataType) rhs).targetType);
+    }
 }