[jira] [Updated] (ARROW-15166) [C++] Implement an array_filter kernel for decimal256

["David Li (Jira)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/ARROW-15166?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

David Li updated ARROW-15166:
-----------------------------
    Labels: good-first-issue kernel  (was: )

> [C++] Implement an array_filter kernel for decimal256
> -----------------------------------------------------
>
>                 Key: ARROW-15166
>                 URL: https://issues.apache.org/jira/browse/ARROW-15166
>             Project: Apache Arrow
>          Issue Type: Improvement
>          Components: C++
>            Reporter: Dragoș Moldovan-Grünfeld
>            Priority: Major
>              Labels: good-first-issue, kernel
>
> This surfaced in some of the R unit tests. I believe the expected behaviour would be to return an empty {{chunked array}}. Reproducible example:
> {code:r}
> suppressMessages(library(arrow))
> empty_filter <- ChunkedArray$create(type = bool())
> one_empty_chunk <- ChunkedArray$create(type = decimal128(4, 2))
> one_empty_chunk$Filter(empty_filter)
> #> ChunkedArray
> #> [
> #> 
> #> ]
> one_empty_chunk <- ChunkedArray$create(type = decimal256(4, 2))
> one_empty_chunk$Filter(empty_filter)
> #>Error: NotImplemented: Function array_filter has no kernel matching input types (array[decimal256(4, 2)], array[bool])
> {code}
> [This suite|https://github.com/apache/arrow/blob/04641a38ee5da0fa1d745fd29fd4a206719338cd/r/tests/testthat/test-chunked-array.R#L209-L236] of unit tests were introduced as part of ARROW-13761. 



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