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https://issues.apache.org/jira/browse/BEAM-4081?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16440363#comment-16440363
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Reuven Lax commented on BEAM-4081:
----------------------------------

agree, however I would recommend being conservative about what we promote to be 
a basic type, and err on keeping the Beam-level type set small. e.g. right now 
I see no good reason for Beam to distinguish between CHAR and VARCHAR, even 
though SQL does need to make this distinction (though maybe we will find a good 
reason for Beam to care).

> Review of schema metadata vs schema types
> -----------------------------------------
>
>                 Key: BEAM-4081
>                 URL: https://issues.apache.org/jira/browse/BEAM-4081
>             Project: Beam
>          Issue Type: Sub-task
>          Components: sdk-java-core
>            Reporter: Kenneth Knowles
>            Priority: Major
>
> The Schema basic types have a place for metadata that can say "this int is 
> really millis since epoch". This deserves some careful design review and 
> perhaps some of these need to be promoted to basic types.



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