jun-he commented on a change in pull request #845: Add persistent IDs to 
partition fields
URL: https://github.com/apache/incubator-iceberg/pull/845#discussion_r406632269
 
 

 ##########
 File path: core/src/main/java/org/apache/iceberg/PartitionSpecParser.java
 ##########
 @@ -138,6 +140,13 @@ private static void 
buildFromJsonFields(PartitionSpec.Builder builder, JsonNode
         "Cannot parse partition spec fields, not an array: %s", json);
 
     Iterator<JsonNode> elements = json.elements();
+
+    boolean hasFieldId = false;
+    if (elements.hasNext() && elements.next().has(FIELD_ID)) {
+      hasFieldId = true;
+    }
+    elements = json.elements();
 
 Review comment:
   👌 

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