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

["ASF GitHub Bot (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/BEAM-5918?focusedWorklogId=162615&page=com.atlassian.jira.plugin.system.issuetabpanels:worklog-tabpanel#worklog-162615 ]

ASF GitHub Bot logged work on BEAM-5918:
----------------------------------------

                Author: ASF GitHub Bot
            Created on: 05/Nov/18 17:46
            Start Date: 05/Nov/18 17:46
    Worklog Time Spent: 10m 
      Work Description: kanterov commented on issue #6888: [BEAM-5918] Add Cast transform for Rows
URL: https://github.com/apache/beam/pull/6888#issuecomment-435967943
 
 
   @kennknowles Gentle ping, or, perhaps, there is somebody else who can help with the review? @akedin 

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Issue Time Tracking
-------------------

    Worklog Id:     (was: 162615)
    Time Spent: 3h 40m  (was: 3.5h)

> 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
>          Time Spent: 3h 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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