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https://issues.apache.org/jira/browse/ARROW-6625?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Wes McKinney resolved ARROW-6625.
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Resolution: Fixed
Issue resolved by pull request 5534
[https://github.com/apache/arrow/pull/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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