alamb commented on code in PR #6138:
URL: https://github.com/apache/arrow-datafusion/pull/6138#discussion_r1179239519
##########
datafusion/common/src/config.rs:
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@@ -223,6 +223,11 @@ config_namespace! {
/// Parquet options
pub parquet: ParquetOptions, default = Default::default()
+
+ /// Fan-out during physical planning.
Review Comment:
```suggestion
/// Fan-out during initial physical planning.
```
##########
datafusion/common/src/config.rs:
##########
@@ -223,6 +223,11 @@ config_namespace! {
/// Parquet options
pub parquet: ParquetOptions, default = Default::default()
+
+ /// Fan-out during physical planning.
+ ///
+ /// This is mostly use to plan `UNION` children in parallel.
+ pub physical_planning_fanout: usize, default = 10
Review Comment:
I recommend calling this "planning_concurrency"
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