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https://issues.apache.org/jira/browse/SPARK-13923?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15198529#comment-15198529
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Yin Huai commented on SPARK-13923:
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Please note that the temp function part of the pr is a placeholder. We will
finish it in the follow-up pr.
> Implement SessionCatalog to manage temp functions and tables
> ------------------------------------------------------------
>
> Key: SPARK-13923
> URL: https://issues.apache.org/jira/browse/SPARK-13923
> Project: Spark
> Issue Type: Bug
> Components: SQL
> Reporter: Andrew Or
> Assignee: Andrew Or
> Fix For: 2.0.0
>
>
> Today, we have ExternalCatalog, which is dead code. As part of the effort of
> merging SQLContext/HiveContext we'll parse Hive commands and call the
> corresponding methods in ExternalCatalog.
> However, this handles only persisted things. We need something in addition to
> that to handle temporary things. The new catalog is called SessionCatalog and
> will internally call ExternalCatalog.
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