[jira] [Created] (SPARK-18522) Create explicit contract for column stats serialization

["Reynold Xin (JIRA)" <ji...@apache.org>]

Reynold Xin created SPARK-18522:
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             Summary: 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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