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Posted to jira@arrow.apache.org by "David Li (Jira)" <ji...@apache.org> on 2022/01/18 14:11:00 UTC

[jira] [Updated] (ARROW-15357) [C++] Directly support nested field refs in exec plan

     [ https://issues.apache.org/jira/browse/ARROW-15357?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

David Li updated ARROW-15357:
-----------------------------
    Labels: query-engine  (was: )

> [C++] Directly support nested field refs in exec plan
> -----------------------------------------------------
>
>                 Key: ARROW-15357
>                 URL: https://issues.apache.org/jira/browse/ARROW-15357
>             Project: Apache Arrow
>          Issue Type: Improvement
>          Components: C++
>            Reporter: David Li
>            Priority: Major
>              Labels: query-engine
>
> ARROW-14658 added support for nested field refs, but aggregations, joins, etc. cannot directly use them (you must first project, then aggregate). The node implementations resolve a field ref into a field path, but then throw away all but the first index, and so they end up referencing the wrong field (the top-level field instead of the nested one). To implement this, we should take care we don't slow down the common case of no nested field refs.



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