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https://issues.apache.org/jira/browse/HIVE-2693?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13533646#comment-13533646
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Mark Grover commented on HIVE-2693:
-----------------------------------
I was playing around with this and noticed that group by on Decimal column
doesn't work because BinarySortableSerDe doesn't support DECIMAL type. It's
questionable if it would ever support it since BigDecimal is arbitrarily long
and BinarySortableSerDe dictates data to be serialized so that the value can be
compared byte by byte with the same order. That would have been ok but it seems
like {{getReduceKeyTableDesc}} in {{PlanUtils.java}} is hardcoded to use
BinarySortableSerDe. I will have to poke around some more to see how Group By
can be made to work with Decimal type (backed by BigDecimal).
In any case, the last patch didn't apply cleanly on trunk, so I fixed some
merge conflicts and am attaching a new patch (#11) which is a refresh of patch
10 that applies cleanly on trunk as of today.
> Add DECIMAL data type
> ---------------------
>
> Key: HIVE-2693
> URL: https://issues.apache.org/jira/browse/HIVE-2693
> Project: Hive
> Issue Type: New Feature
> Components: Query Processor, Types
> Affects Versions: 0.10.0
> Reporter: Carl Steinbach
> Assignee: Prasad Mujumdar
> Attachments: 2693_7.patch, 2693_8.patch, 2693_fix_all_tests1.patch,
> HIVE-2693-10.patch, HIVE-2693-11.patch, HIVE-2693-1.patch.txt,
> HIVE-2693-all.patch, HIVE-2693-fix.patch, HIVE-2693.patch,
> HIVE-2693-take3.patch, HIVE-2693-take4.patch
>
>
> Add support for the DECIMAL data type. HIVE-2272 (TIMESTAMP) provides a nice
> template for how to do this.
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