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https://issues.apache.org/jira/browse/ARROW-17826?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Joris Van den Bossche resolved ARROW-17826.
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Fix Version/s: 10.0.0
Resolution: Fixed
Issue resolved by pull request 14360
[https://github.com/apache/arrow/pull/14360]
> [Python] Allow scalars when creating expression from compute kernels
> --------------------------------------------------------------------
>
> Key: ARROW-17826
> URL: https://issues.apache.org/jira/browse/ARROW-17826
> Project: Apache Arrow
> Issue Type: Improvement
> Components: Python
> Reporter: Joris Van den Bossche
> Assignee: Miles Granger
> Priority: Major
> Labels: expressions, pull-request-available
> Fix For: 10.0.0
>
> Time Spent: 50m
> Remaining Estimate: 0h
>
> We can create an expression (eg for a projection) using the compute kernels
> and passing expressions as arguments. But currently, all other arguments need
> to be expressions:
> {code:python}
> >>> pc.add(pc.field("a"), pc.field("b")) # this works
> <pyarrow.compute.Expression add(a, b)>
> >>> pc.add(pc.field("a"), 1) # this fails when passing scalar (same for
> >>> pa.scalar(1))
> ...
> TypeError: only other expressions allowed as arguments
> {code}
> You can still pass a scalar expression ({{pc.scalar(1)}}, note {{pc.}} not
> {{pa.}}), but I think for scalars it would be a nice usability improvement if
> it's not needed to manually convert your python or pyarrow scalar to a scalar
> expression.
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