[jira] [Commented] (ARROW-16882) Allow to pick comparison function for pyarrow joins

["Ian Cook (Jira)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/ARROW-16882?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17557673#comment-17557673 ] 

Ian Cook commented on ARROW-16882:
----------------------------------

To clarify: Do you want the ability for null values in the key column of the left table to match null values in the key column of the right table in a join?

The way that some SQL databases deal with this is by using the {{IS NOT DISTINCT FROM}} operator in join conditions:
{code:java}
x IS NOT DISTINCT FROM y{code}
There is also a shorthand for this:
{code:java}
x <=> y {code}

> Allow to pick comparison function for pyarrow joins
> ---------------------------------------------------
>
>                 Key: ARROW-16882
>                 URL: https://issues.apache.org/jira/browse/ARROW-16882
>             Project: Apache Arrow
>          Issue Type: Improvement
>          Components: Python
>    Affects Versions: 8.0.0
>            Reporter: Alessandro Molina
>            Assignee: Alessandro Molina
>            Priority: Critical
>             Fix For: 9.0.0
>
>
> See https://github.com/apache/arrow/issues/13408
> We probably want to allow end users to pick {{JoinKeyCmp::EQ}} or {{JoinKeyCmp::IS}} to perform the comparison



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