avantgardnerio commented on code in PR #6138:
URL: https://github.com/apache/arrow-datafusion/pull/6138#discussion_r1183777356
##########
datafusion/common/src/config.rs:
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@@ -226,6 +226,11 @@ config_namespace! {
/// Aggregate options
pub aggregate: AggregateOptions, default = Default::default()
+
+ /// Fan-out during initial physical planning.
+ ///
+ /// This is mostly use to plan `UNION` children in parallel.
+ pub planning_concurrency: usize, default = 10
Review Comment:
Github doesn't let me link, but online 216 is this:
```
/// Number of partitions for query execution. Increasing partitions
can increase
/// concurrency. Defaults to the number of CPU cores on the system
pub target_partitions: usize, default = num_cpus::get()
```
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