Daniel Nugent created ARROW-6625:
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Summary: 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
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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