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https://issues.apache.org/jira/browse/SPARK-14918?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Cheng Lian resolved SPARK-14918.
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Resolution: Not A Problem
> 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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