[ https://issues.apache.org/jira/browse/ARROW-18334?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Weston Pace updated ARROW-18334: -------------------------------- 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. -- This message was sent by Atlassian Jira (v8.20.10#820010)