[jira] [Commented] (SPARK-22637) CatalogImpl.refresh() has quadratic complexity for a view

["Apache Spark (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/SPARK-22637?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16269472#comment-16269472 ] 

Apache Spark commented on SPARK-22637:
--------------------------------------

User 'hvanhovell' has created a pull request for this issue:
https://github.com/apache/spark/pull/19837

> CatalogImpl.refresh() has quadratic complexity for a view
> ---------------------------------------------------------
>
>                 Key: SPARK-22637
>                 URL: https://issues.apache.org/jira/browse/SPARK-22637
>             Project: Spark
>          Issue Type: Bug
>          Components: SQL
>    Affects Versions: 2.2.0
>            Reporter: Herman van Hovell
>            Priority: Minor
>
> {{org.apache.spark.sql.internal.refreshTable}} uses {{foreach(..)}} to refresh all tables in a view. This traverses all nodes in the subtree and calls {{LogicalPlan.refresh()}} on these nodes. However {{LogicalPlan.refresh()}} is also refreshing its children, as a result refreshing a large view can be quite expensive.



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