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https://issues.apache.org/jira/browse/HIVE-5756?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13840571#comment-13840571
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Eric Hanson commented on HIVE-5756:
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Regarding (1), that is a good observation. I had assumed the type checker would
not allow that. Fortunately, the plan will not vectorize if the two different
IF outputs have different types. I think we should leave it this way since
having two different output types for the IF and ELSE branches is a rare
scenario. We could do another JIRA later to handle that case in vectorized mode.
> Implement vectorization support for IF conditional expression for long,
> double, timestamp and boolean inputs
> ------------------------------------------------------------------------------------------------------------
>
> Key: HIVE-5756
> URL: https://issues.apache.org/jira/browse/HIVE-5756
> Project: Hive
> Issue Type: Sub-task
> Reporter: Eric Hanson
> Assignee: Eric Hanson
> Attachments: HIVE-5756.1.patch, HIVE-5756.2.patch, HIVE-5756.3.patch,
> HIVE-5756.4.patch, HIVE-5756.5.patch
>
>
> Implement full, end-to-end support for IF in vectorized mode, including new
> VectorExpression class(es), VectorizationContext translation to a
> VectorExpression, and unit tests for these, as well as end-to-end ad hoc
> testing. An end-to-end .q test is recommended but optional.
> This is high priority because IF is the most popular conditional expression.
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