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https://issues.apache.org/jira/browse/HIVE-6210?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Eric Chu resolved HIVE-6210.
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Resolution: Not A Problem
> Default serde for RCFile has changed
> ------------------------------------
>
> Key: HIVE-6210
> URL: https://issues.apache.org/jira/browse/HIVE-6210
> Project: Hive
> Issue Type: Bug
> Components: File Formats
> Affects Versions: 0.12.0
> Reporter: Eric Chu
>
> In Hive 10 when I create a table in RCFile, the serde is
> org.apache.hadoop.hive.serde2.columnar.ColumnarSerDe
> In Hive 12 when I do the same thing, the serde becomes
> org.apache.hadoop.hive.serde2.columnar.LazyBinaryColumnarSerDe
> Similarly, in Hive 12, when I set FILEFORMAT to RCFILE, the serde will become
> LazyBinaryColumnarSerDe, as opposed to ColumnarSerDe in previous versions.
> What is the reason behind this change? This seems like a regression bug to me.
> Normally, we can work around the issue by explicitly setting the table serde
> to be org.apache.hadoop.hive.serde2.columnar.ColumnarSerDe. However, this
> causes a problem for our migration to ORC. Specifically, we have a
> partitioned table for which we want the new partitions to have locations
> pointing to ORC partitions, and the old partitions to have locations pointing
> to RCFILE partitions. Moreover, we need the ability to change the location of
> a partition to point to RCFILE partition. For this we'd do so by doing SET
> FILEFORMAT RCFILE. However, b/c of this serde problem the RCFile partition in
> an ORC table will have the wrong serde, and ALTER TABLE doesn't allow us to
> set serde for a partition.
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