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https://issues.apache.org/jira/browse/SPARK-18727?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15987976#comment-15987976
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Xin Wu commented on SPARK-18727:
--------------------------------

Thanks! 

> Support schema evolution as new files are inserted into table
> -------------------------------------------------------------
>
>                 Key: SPARK-18727
>                 URL: https://issues.apache.org/jira/browse/SPARK-18727
>             Project: Spark
>          Issue Type: Bug
>          Components: SQL
>    Affects Versions: 2.1.0
>            Reporter: Eric Liang
>            Priority: Critical
>
> Now that we have pushed partition management of all tables to the catalog, 
> one issue for scalable partition handling remains: handling schema updates.
> Currently, a schema update requires dropping and recreating the entire table, 
> which does not scale well with the size of the table.
> We should support updating the schema of the table, either via ALTER TABLE, 
> or automatically as new files with compatible schemas are appended into the 
> table.
> cc [~rxin]



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