[
https://issues.apache.org/jira/browse/ARROW-1560?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16809983#comment-16809983
]
Preeti Suman commented on ARROW-1560:
-------------------------------------
For match (and isin) compute kernel , in left and right array, if there are
nulls in the input,
a) Do we need to match null with null or ignore null completely?
Example:
match(['a', 'b', null], ['a', 'c', null])
Expected output [0, null, 2]
b) If we need to compare, what will be the suggested way to traverse nulls if
we use the VisitValue and VisitNull (using
[ArrayDataVisitor|https://github.com/apache/arrow/blob/master/cpp/src/arrow/visitor_inline.h]{color:#000000})
for the array?{color}
> [C++] Kernel implementations for "match" function
> -------------------------------------------------
>
> Key: ARROW-1560
> URL: https://issues.apache.org/jira/browse/ARROW-1560
> Project: Apache Arrow
> Issue Type: New Feature
> Components: C++
> Reporter: Wes McKinney
> Assignee: Preeti Suman
> Priority: Major
> Labels: Analytics
> Fix For: 0.14.0
>
>
> Match computes a position index array from an array values into a set of
> categories
> {code}
> match(['a', 'b', 'a', null, 'b', 'a', 'b'], ['b', 'a'])
> return [1, 0, 1, null, 0, 1, 0]
> {code}
--
This message was sent by Atlassian JIRA
(v7.6.3#76005)
