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Posted to jira@arrow.apache.org by "David Li (Jira)" <ji...@apache.org> on 2021/03/16 21:32:00 UTC
[jira] [Comment Edited] (ARROW-11981) [C++][Dataset][Compute]
Replace UnionDataset with Union ExecNode
[ https://issues.apache.org/jira/browse/ARROW-11981?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17302908#comment-17302908 ]
David Li edited comment on ARROW-11981 at 3/16/21, 9:31 PM:
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[~bkietz] Sorry, you've got the wrong [~davidli]. I am not associated with this project!
was (Author: davidli):
[~bkietz] Wrong David Li
> [C++][Dataset][Compute] Replace UnionDataset with Union ExecNode
> ----------------------------------------------------------------
>
> Key: ARROW-11981
> URL: https://issues.apache.org/jira/browse/ARROW-11981
> Project: Apache Arrow
> Issue Type: Improvement
> Components: C++
> Affects Versions: 3.0.0
> Reporter: Ben Kietzman
> Priority: Major
> Labels: dataset
>
> UnionDataset allows Fragments of multiple schemas and differing file formats to be scanned together as a single Dataset. This is useful functionality but makes the Dataset interface somewhat difficult to reason about since it must be general enough to accommodate UnionDataset.
> After ARROW-11928 it will probably be more natural to support unioning of datasets through a subclass of ExecNode. Reconciliation of differing schemas can then be trivially handled by a full ProjectNode.
> Note this would obviate both ARROW-11001 and ARROW-11749. In addition, Dataset could be simplified to a concrete class containing a set of compatibly typed/formatted Fragments.
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