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https://issues.apache.org/jira/browse/HIVE-164?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12703468#action_12703468
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Zheng Shao commented on HIVE-164:
---------------------------------
> A question - In most of the xyzOperator.java code the InspectableObjects have
> been done away with and replaced with ObjectInspector + Object. Why?
Because we don't need InspectableObject there any more - exprNodeEvaluators are
dealing with Inspector in initialize and Object in evaluate, so we don't need a
wrapper like InspectableObject like before. This takes advantage of the fact
that the ObjectInspector that gets passed via InspectableObject is always the
same. This also makes the code clearer because developers can directly see that
fact. It also improves the performance a little bit because we are doing one
less level of indirection.
I don't foresee any places that we would need InspectableObject in the future -
it was added as a replacement for HiveObject long time back. Since we are
moving the Inspector part to compile time or execution-initialization time, I
don't see any places we need to pass Object and ObjectInspector at the same
time.
> I suppose you are going to subsume tag within the row as that makes
> serialization and deserialization of tag easy. Not sure if you are tackling
> this as part of HIVE-450. If yes then please ignore this comment.
I plan to do that with HIVE-405 since this one has taken too long and
introduced a lot of conflicts along the way.
> Support CASE statement using GenericUDF
> ---------------------------------------
>
> Key: HIVE-164
> URL: https://issues.apache.org/jira/browse/HIVE-164
> Project: Hadoop Hive
> Issue Type: New Feature
> Components: Query Processor
> Affects Versions: 0.4.0
> Reporter: Zheng Shao
> Assignee: Zheng Shao
> Fix For: 0.4.0
>
> Attachments: HIVE-164.4.patch, HIVE-164.5.patch,
> HIVE-164.6.code-only.patch, HIVE-164.6.patch, HIVE-164.7.code-only.patch,
> HIVE-164.7.patch, HIVE-164.8.patch
>
>
> See http://dev.mysql.com/doc/refman/5.0/en/control-flow-functions.html for
> details.
> Syntax:
> {code}
> CASE value WHEN [compare_value] THEN result [WHEN [compare_value] THEN result
> ...] [<ELSE result] END
> CASE WHEN [condition] THEN result [WHEN [condition] THEN result ...] [ELSE
> result] END
> {code}
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