[jira] [Assigned] (ARROW-4728) [JS] Failing test Table#assign with a zero-length Null column round-trips through serialization

[Paul Taylor (JIRA)]

     [ 
https://issues.apache.org/jira/browse/ARROW-4728?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
 ]

Paul Taylor reassigned ARROW-4728:
----------------------------------

    Assignee: Paul Taylor

> [JS] Failing test Table#assign with a zero-length Null column round-trips 
> through serialization
> -----------------------------------------------------------------------------------------------
>
>                 Key: ARROW-4728
>                 URL: https://issues.apache.org/jira/browse/ARROW-4728
>             Project: Apache Arrow
>          Issue Type: Bug
>          Components: JavaScript
>    Affects Versions: 0.12.1
>            Reporter: Francois Saint-Jacques
>            Assignee: Paul Taylor
>            Priority: Major
>              Labels: ci-failure, travis-ci
>             Fix For: 0.13.0
>
>
> See https://travis-ci.org/apache/arrow/jobs/500414242#L1002
> {code:javascript}
>   ● Table#serialize() › Table#assign with an empty table round-trips through 
> serialization
>     expect(received).toBe(expected) // Object.is equality
>     Expected: 86
>     Received: 41
>       91 |             const source = table1.assign(Table.empty());
>       92 |             expect(source.numCols).toBe(table1.numCols);
>     > 93 |             expect(source.length).toBe(table1.length);
>          |                                   ^
>       94 |             const result = Table.from(source.serialize());
>       95 |             expect(result).toEqualTable(source);
>       96 |             
> expect(result.schema.metadata.get('foo')).toEqual('bar');
>       at Object.test (test/unit/table/serialize-tests.ts:93:35)
>   ● Table#serialize() › Table#assign with a zero-length Null column 
> round-trips through serialization
>     expect(received).toBe(expected) // Object.is equality
> {code}



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