viirya commented on code in PR #8394:
URL: https://github.com/apache/arrow-datafusion/pull/8394#discussion_r1412858046
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datafusion/core/src/physical_optimizer/pruning.rs:
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@@ -251,8 +266,12 @@ fn is_always_true(expr: &Arc<dyn PhysicalExpr>) -> bool {
.unwrap_or_default()
}
-/// Records for which columns statistics are necessary to evaluate a
-/// pruning predicate.
+/// Describes which columns statistics are necessary to evaluate a
+/// [`PruningPredicate`].
+///
+/// This structure permits reading and creating the minimum number statistics,
+/// which is important since statistics may be non trivial to read (e.g. large
+/// strings or when there are 1000s of columns.
Review Comment:
```suggestion
/// which is important since statistics may be non trivial to read (e.g.
large
/// strings or when there are 1000s of columns).
```
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