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Posted to issues@spark.apache.org by "Xin Wu (JIRA)" <ji...@apache.org> on 2016/12/07 19:36:58 UTC
[jira] [Commented] (SPARK-18727) Support schema evolution as new
files are inserted into table
[ https://issues.apache.org/jira/browse/SPARK-18727?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15729696#comment-15729696 ]
Xin Wu commented on SPARK-18727:
--------------------------------
I am currently working on ALTER TABLE ADD COLUMNS, to tables with provider = hive and will submit a PR soon. Just wondering whether it will solve part of this JIRA. Please advise! 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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