[jira] [Resolved] (BEAM-5918) Add Cast transform for Rows

["Gleb Kanterov (Jira)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/BEAM-5918?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Gleb Kanterov resolved BEAM-5918.
---------------------------------
    Fix Version/s: Not applicable
       Resolution: Fixed

> Add Cast transform for Rows
> ---------------------------
>
>                 Key: BEAM-5918
>                 URL: https://issues.apache.org/jira/browse/BEAM-5918
>             Project: Beam
>          Issue Type: Improvement
>          Components: sdk-java-core
>            Reporter: Gleb Kanterov
>            Assignee: Gleb Kanterov
>            Priority: Major
>             Fix For: Not applicable
>
>          Time Spent: 9h 40m
>  Remaining Estimate: 0h
>
> There is a need for a generic transform that given two Row schemas will convert rows between them. There must be a possibility to opt-out from certain kind of conversions, for instance, converting ints to shorts can cause overflow. Another example, a schema could have a nullable field, but never have NULL value in practice, because it was filtered out.
> What is needed:
> - widening values (e.g., int -> long)
> - narrowwing (e.g., int -> short)
> - runtime check for overflow while narrowing
> - ignoring nullability (nullable=true -> nullable=false)
> - weakening nullability (nullable=false -> nullable=true)
> - projection (Schema(a: Int32, b: Int32) -> Schema(a: Int32))



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