matthewmturner commented on a change in pull request #1063:
URL: https://github.com/apache/arrow-datafusion/pull/1063#discussion_r749531956
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File path: datafusion/src/physical_optimizer/aggregate_statistics.rs
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@@ -153,6 +159,39 @@ fn take_optimizable_count(
None
}
+/// If this agg_expr is a count that can be derived from the statistics,
return it
+fn take_optimizable_count_with_nulls(
+ agg_expr: &dyn AggregateExpr,
+ stats: &Statistics,
+) -> Option<(ScalarValue, String)> {
+ if let (Some(num_rows), Some(col_stats), Some(casted_expr)) = (
+ stats.num_rows,
+ &stats.column_statistics,
+ agg_expr.as_any().downcast_ref::<expressions::Count>(),
+ ) {
+ if casted_expr.expressions().len() == 1 {
Review comment:
Ok - ive updated. Let me know if anything else needed.
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