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https://issues.apache.org/jira/browse/ARROW-9838?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Andy Grove closed ARROW-9838.
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Resolution: Fixed
This was merged already but Jira was not updated for some reason:
https://github.com/apache/arrow/commit/46b6dc642bf5c826a6c8be903b5c73b749e8cd30
> [Rust] [DataFusion] DefaultPhysicalPlanner should insert explicit MergeExec
> nodes
> ---------------------------------------------------------------------------------
>
> Key: ARROW-9838
> URL: https://issues.apache.org/jira/browse/ARROW-9838
> Project: Apache Arrow
> Issue Type: Sub-task
> Components: Rust, Rust - DataFusion
> Reporter: Andy Grove
> Assignee: Andy Grove
> Priority: Major
> Fix For: 2.0.0
>
>
> Operators such as GlobalLimitExec, SortExec, and HashAggregateExec (in some
> cases) require a single input partition. Rather than have these operators
> perform their own merging of input partitions, the planner should insert
> explicit MergeExec nodes into the physical plan, when needed.
>
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