[jira] [Created] (SPARK-14918) ExternalCatalog.TablePartitionSpec doesn't preserve partition column order

["Cheng Lian (JIRA)" <ji...@apache.org>]

Cheng Lian created SPARK-14918:
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             Summary: ExternalCatalog.TablePartitionSpec doesn't preserve partition column order
                 Key: SPARK-14918
                 URL: https://issues.apache.org/jira/browse/SPARK-14918
             Project: Spark
          Issue Type: Bug
          Components: SQL
    Affects Versions: 2.0.0
            Reporter: Cheng Lian
            Assignee: Cheng Lian


Equivalent entity of {{ExternalCatalog.TablePartitionSpec}} in Hive is a {{LinkedHashMap}} returned by {{Partition.getSpec()}}, which preserves partition column order.

However, we are using a {{scala.immutable.Map}} to store the result, which no longer preserves the original order. What makes it worse, Scala specializes immutable maps with less than 5 elements. And these specialized versions do preserve order, thus hides this issue in test cases since we never use more than 4 partition columns.




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