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https://issues.apache.org/jira/browse/HIVE-14515?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15433933#comment-15433933
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Matt McCline commented on HIVE-14515:
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The approach I was working on was to put all the test data into one file and do 
INSERT INTO TABLE convert_table SELECT int1, string1, ... FROM test_data ...

> Schema evolution uses slow INSERT INTO .. VALUES
> ------------------------------------------------
>
>                 Key: HIVE-14515
>                 URL: https://issues.apache.org/jira/browse/HIVE-14515
>             Project: Hive
>          Issue Type: Sub-task
>          Components: Hive
>            Reporter: Matt McCline
>            Assignee: Matt McCline
>            Priority: Critical
>
> Use LOAD DATA LOCAL INPATH and INSERT INTO TABLE ... SELECT * FROM instead.



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