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https://issues.apache.org/jira/browse/HIVE-4821?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13793005#comment-13793005
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Eric Hanson commented on HIVE-4821:
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I created HIVE-5517 to cover adding .q tests for casts and other new vectorized
functions. Will that be okay to do it separately soon?
> Implement vectorized type casting for all types
> -----------------------------------------------
>
> Key: HIVE-4821
> URL: https://issues.apache.org/jira/browse/HIVE-4821
> Project: Hive
> Issue Type: Sub-task
> Affects Versions: 0.13.0
> Reporter: Eric Hanson
> Assignee: Eric Hanson
> Attachments: HIVE-4821.2.patch
>
>
> Implement vectorized support for casting from any type to any type.
> From the documentation:
> cast(expr as <type>): Converts the results of the expression expr to <type>
> e.g. cast('1' as BIGINT) will convert the string '1' to it integral
> representation. A null is returned if the conversion does not succeed
> The current supported internal types are:
> LONG
> DOUBLE
> STRING
> TIMESTAMP
> Before implementation, determine what are the semantics of explicit casting
> to types less general than the internal types. E.g. what if you cast DOUBLE
> to TINYINT? Can we just cast internally to LONG and let the output process
> cast to TINYINT?
> This JIRA includes all work to make casting operate end-to-end in a SQL query
> in vectorized mode, including updates to VectorizationContext.
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