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https://issues.apache.org/jira/browse/ARROW-18334?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Weston Pace updated ARROW-18334:
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Summary: add function for timestamp/duration is not commutative (was:
Expression::Canonicalize does not unbind the expression from a kernel)
> add function for timestamp/duration is not commutative
> ------------------------------------------------------
>
> Key: ARROW-18334
> URL: https://issues.apache.org/jira/browse/ARROW-18334
> Project: Apache Arrow
> Issue Type: Bug
> Components: C++
> Reporter: Weston Pace
> Priority: Major
>
> In general, we get away with this, since most kernels are of the shape
> {{FOO(T, T)}}. However, when the input types differ, this can be a problem.
> Concretely, we have kernels:
> {noformat}
> add_checked<Timestamp,Duration>() -> types[0]
> add_checked<Duration,Timestamp>() -> types[1]
> {noformat}
> A call is made with expression {{field_ref("x") + duration_literal}}. This
> call is bound to {{add_checked<Timestamp, Duration>}}. However, the
> expression is then simplified to {{duration_literal + field_ref("x")}}.
> Oddly enough, the math in this case is correct, since it is just addition,
> but the output type is not. It assigns an output type of duration instead of
> timestamp.
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