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https://issues.apache.org/jira/browse/PHOENIX-2048?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15848114#comment-15848114
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Csaba Skrabak commented on PHOENIX-2048:
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[^phoenix-2048.patch] is the solution that always uses HALF_UP. It is an
_incompatible_ change.
I don't know about the configurable ideas. Is there any example in Phoenix for
a function that behaves different ways depending on configuration?
> change to_char() function to use HALF_UP rounding mode
> ------------------------------------------------------
>
> Key: PHOENIX-2048
> URL: https://issues.apache.org/jira/browse/PHOENIX-2048
> Project: Phoenix
> Issue Type: Improvement
> Affects Versions: verify
> Reporter: Jonathan Leech
> Priority: Minor
> Fix For: 4.10.0
>
> Attachments: phoenix-2048.patch
>
>
> to_char() function uses the default rounding mode in java DecimalFormat,
> which is a strange one called HALF_EVEN, which rounds a '5' in the last
> position either up or down depending on the preceding digit.
> Change it to HALF_UP so it rounds the same way as the round() function does,
> or provide a way to override the behavior; e.g. globally or as a client
> config, or an argument to the to_char() function.
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