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https://issues.apache.org/jira/browse/HIVE-2248?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Siying Dong updated HIVE-2248:
------------------------------
Summary: Comparison Operators convert number types to common type instead
of double if possible (was: Comparison Operators convert number types to
common type instead of double if necessary)
> Comparison Operators convert number types to common type instead of double if
> possible
> --------------------------------------------------------------------------------------
>
> Key: HIVE-2248
> URL: https://issues.apache.org/jira/browse/HIVE-2248
> Project: Hive
> Issue Type: Bug
> Components: Query Processor
> Reporter: Siying Dong
> Assignee: Siying Dong
> Fix For: 0.8.0
>
> Attachments: HIVE-2248.1.patch
>
>
> Now if the two sides of comparison is of different type, we always convert
> both to double and compare. It was a slight regression from the change in
> https://issues.apache.org/jira/browse/HIVE-1638. The old UDFOP<Comparison>,
> using GenericUDFBridge, always tried to find common type first.
> The worse case is this: If you did "WHERE <BIGINT_COLUMN> = 0 ", we always
> convert the column and 0 to double and compare, which is wasteful, though it
> is usually a minor costs in the system. But it is easy to fix.
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