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https://issues.apache.org/jira/browse/HIVE-12894?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15116586#comment-15116586
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Andrew Sears commented on HIVE-12894:
-------------------------------------

Does this need to be documented in the wiki?

     HIVE_SCHEMA_EVOLUTION("hive.exec.schema.evolution", false,
         "Use schema evolution to convert self-describing file format's data to 
the schema desired by the reader."),
 
    HIVE_TRANSACTIONAL_TABLE_SCAN("hive.transactional.table.scan", false,
        "Do transaction (ACID) table scan."),

     HIVESAMPLERANDOMNUM("hive.sample.seednumber", 0,
         "A number used to percentage sampling. By changing this number, user 
will change the subsets of data sampled."),

> Detect whether ORC is reading from ACID table correctly for Schema Evolution
> ----------------------------------------------------------------------------
>
>                 Key: HIVE-12894
>                 URL: https://issues.apache.org/jira/browse/HIVE-12894
>             Project: Hive
>          Issue Type: Bug
>          Components: Hive, ORC
>            Reporter: Matt McCline
>            Assignee: Matt McCline
>            Priority: Critical
>             Fix For: 2.1.0
>
>         Attachments: HIVE-12894.01.patch, HIVE-12894.02.patch, 
> HIVE-12894.03.patch
>
>
> Set an configuration variable with 'transactional' property to indicate the 
> table is ACID.



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