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https://issues.apache.org/jira/browse/BEAM-7554?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17503632#comment-17503632
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Ilango Rajagopal commented on BEAM-7554:
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Due to this issue, cross language transforms are affected. For example, when 
using ReadFromJdbc transform in python, we get the decimal and datetime as 
logical types, but they are encoded differently than the underlying 
representation types, resulting in incorrect values.

> datetime and decimal should be logical types
> --------------------------------------------
>
>                 Key: BEAM-7554
>                 URL: https://issues.apache.org/jira/browse/BEAM-7554
>             Project: Beam
>          Issue Type: Improvement
>          Components: sdk-java-core
>            Reporter: Brian Hulette
>            Priority: P3
>              Labels: Clarified
>          Time Spent: 1h 50m
>  Remaining Estimate: 0h
>
> Currently datetime and decimal are implemented as primitive types in the Java 
> SDK. They should be logical types as documented in 
> https://s.apache.org/beam-schemas



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