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https://issues.apache.org/jira/browse/SPARK-18911?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15756389#comment-15756389
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Apache Spark commented on SPARK-18911:
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User 'wzhfy' has created a pull request for this issue:
https://github.com/apache/spark/pull/16323
> Decouple Statistics and CatalogTable
> ------------------------------------
>
> Key: SPARK-18911
> URL: https://issues.apache.org/jira/browse/SPARK-18911
> Project: Spark
> Issue Type: Sub-task
> Components: SQL
> Reporter: Zhenhua Wang
>
> Statistics in LogicalPlan should use attributes to refer to columns rather
> than column names, because two columns from two relations can have the same
> column name. But CatalogTable doesn't have the concepts of attribute or
> broadcast hint in Statistics. Therefore, putting Statistics in CatalogTable
> is confusing. We need to define a different statistic structure in
> CatalogTable, which is only responsible for interacting with metastore, and
> is converted to statistics in LogicalPlan when it is used.
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