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https://issues.apache.org/jira/browse/HIVE-6012?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13889108#comment-13889108
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Jason Dere commented on HIVE-6012:
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Had some offline discussion about the config setting to use here. Suggestion
was to use a single config setting (say, hive.compat) to control backward
compatibility behavior. Rather than make the config setting a simple true/false
switch, the config setting would be a string to indicate what version of Hive
behavior to support (0.12, 0.13, etc). So for Thejas' example in his comment,
setting hive.compat=0.12 would set int / int => double. If there were
additional (configurable) behavior changes added in 0.14, they could be
disabled by setting hive.compat=0.13, or even back to 0.12 if the user still
wants the old int / int behavior.
I'll try to take a crack at this.
> restore backward compatibility of arithmetic operations
> -------------------------------------------------------
>
> Key: HIVE-6012
> URL: https://issues.apache.org/jira/browse/HIVE-6012
> Project: Hive
> Issue Type: Bug
> Components: Query Processor
> Affects Versions: 0.13.0
> Reporter: Thejas M Nair
> Assignee: Jason Dere
> Attachments: HIVE-6012.1.patch, HIVE-6012.2.patch, HIVE-6012.3.patch
>
>
> HIVE-5356 changed the behavior of some of the arithmetic operations, and the
> change is not backward compatible, as pointed out in this [jira
> comment|https://issues.apache.org/jira/browse/HIVE-5356?focusedCommentId=13813398&page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#comment-13813398]
> {code}
> int / int => decimal
> float / float => double
> float * float => double
> float + float => double
> {code}
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