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https://issues.apache.org/jira/browse/SPARK-18727?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15987966#comment-15987966
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Eric Liang commented on SPARK-18727:
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+1 for supporting ALTER TABLE REPLACE COLUMNS
> 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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