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https://issues.apache.org/jira/browse/ARROW-16475?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17534003#comment-17534003
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Weston Pace commented on ARROW-16475:
-------------------------------------
{{pc.call_function}} works for me. I'll update the title.
> [Python] Publically expose Expression._call
> -------------------------------------------
>
> Key: ARROW-16475
> URL: https://issues.apache.org/jira/browse/ARROW-16475
> Project: Apache Arrow
> Issue Type: Improvement
> Components: Python
> Reporter: Weston Pace
> Priority: Major
>
> When writing a projection expression I can write something clean when using
> the builtin functions:
> {noformat}
> dataset.to_table(columns={'projected': pc.ascii_upper(ds.field('name'))})
> {noformat}
> However, if I am using a custom function (UDF) then there isn't a great
> solution today that I can find. The best I can come up with is:
> {noformat}
> dataset.to_table(columns={'projected': pc.Expression._call('my_udf',
> [ds.field('name')])})
> {noformat}
> I'd think one approach could be:
> {noformat}
> dataset.to_table(columns={'projected': pc.call('my_udf', [ds.field('name')])})
> {noformat}
> However, I'm open to other suggestions as well.
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