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https://issues.apache.org/jira/browse/SPARK-18522?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15682815#comment-15682815
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Apache Spark commented on SPARK-18522:
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User 'rxin' has created a pull request for this issue:
https://github.com/apache/spark/pull/15959
> Create explicit contract for column stats serialization
> -------------------------------------------------------
>
> Key: SPARK-18522
> URL: https://issues.apache.org/jira/browse/SPARK-18522
> Project: Spark
> Issue Type: Sub-task
> Components: SQL
> Reporter: Reynold Xin
> Assignee: Reynold Xin
>
> The current implementation of column stats uses the base64 encoding of the
> internal UnsafeRow format to persist statistics (in table properties in Hive
> metastore). This is an internal format that is not stable across different
> versions of Spark and should NOT be used for persistence.
> In addition, it would be better if statistics stored in the catalog is human
> readable.
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