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https://issues.apache.org/jira/browse/ARROW-413?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15746195#comment-15746195
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Julian Hyde commented on ARROW-413:
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By the way, Phoenix uses longs to represent dates and not all the code rounds
them (d -= d % 8640000) and it gets tricky. (Who's going to burn CPU cycles
rounding a value that they're 99.9% sure has been rounded?!) As a result you're
never quite sure whether two date values have been rounded, and sometimes
someone from Moscow writes some data that drifts into the previous day.
> DATE type is not specified clearly
> ----------------------------------
>
> Key: ARROW-413
> URL: https://issues.apache.org/jira/browse/ARROW-413
> Project: Apache Arrow
> Issue Type: Bug
> Components: Format
> Affects Versions: 0.1.0
> Reporter: Uwe L. Korn
>
> Currently the DATE type is not specified anywhere and needs to be documented.
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