yjshen commented on a change in pull request #1700:
URL: https://github.com/apache/arrow-datafusion/pull/1700#discussion_r795028433
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File path: datafusion/src/execution/context.rs
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@@ -1115,9 +1114,14 @@ impl ExecutionConfig {
/// An instance of this struct is created each time a [`LogicalPlan`] is
prepared for
/// execution (optimized). If the same plan is optimized multiple times, a new
/// `ExecutionProps` is created each time.
+///
+/// It is important that this structure be cheap to create as it is
+/// done so during predicate pruning and expression simplification
Review comment:
👍
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