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https://issues.apache.org/jira/browse/BEAM-5918?focusedWorklogId=160696&page=com.atlassian.jira.plugin.system.issuetabpanels:worklog-tabpanel#worklog-160696
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ASF GitHub Bot logged work on BEAM-5918:
----------------------------------------
Author: ASF GitHub Bot
Created on: 30/Oct/18 16:07
Start Date: 30/Oct/18 16:07
Worklog Time Spent: 10m
Work Description: kanterov removed a comment on issue #6888: [BEAM-5918]
Add Cast transform for Rows
URL: https://github.com/apache/beam/pull/6888#issuecomment-434363483
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Issue Time Tracking
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Worklog Id: (was: 160696)
Time Spent: 0.5h (was: 20m)
> 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: Kenneth Knowles
> Priority: Major
> Time Spent: 0.5h
> 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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