Wes McKinney resolved ARROW-6625.
    Resolution: Fixed

Issue resolved by pull request 5534

> [Python] Allow concat_tables to null or default fill missing columns
> --------------------------------------------------------------------
>                 Key: ARROW-6625
>                 URL: https://issues.apache.org/jira/browse/ARROW-6625
>             Project: Apache Arrow
>          Issue Type: Wish
>          Components: Python
>            Reporter: Daniel Nugent
>            Assignee: Zhuo Peng
>            Priority: Minor
>              Labels: pull-request-available
>             Fix For: 1.0.0
>          Time Spent: 8h 50m
>  Remaining Estimate: 0h
> The concat_tables function currently requires schemas to be identical across 
> all tables to be concat'ed together. However, tables occasionally are 
> conforming on type where present, but a column will be absent.
> In this case, allowing for null filling (or default filling) would be ideal.
> I imagine this feature would be an optional parameter on the concat_tables 
> function. Presumably the argument could be either a boolean in the case of 
> blanket null filling, or a mapping type for default filling. If a user wanted 
> to default fill some columns, but null fill others, they could use a None as 
> the value (defaultdict would make it simple to provide a blanket null fill if 
> only a few default value columns were desired).
> If a mapping wasn't present, the function should probably raise an error.
> The default behavior would be the current and thus the default value of the 
> parameter should be False or None.

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