pepijnve commented on code in PR #17898:
URL: https://github.com/apache/datafusion/pull/17898#discussion_r2403843754
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datafusion/physical-expr/src/expressions/case.rs:
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@@ -208,10 +208,19 @@ impl CaseExpr {
let mut current_value = new_null_array(&return_type, batch.num_rows());
// We only consider non-null values while comparing with whens
let mut remainder = not(&base_nulls)?;
+ let mut remainder_count = remainder.true_count();
Review Comment:
Good to know that that’s fairly cheap.
What I’m experimenting with is retaining the filtered record batch from one
loop iteration to the next so that the amount of data to be churned through
each iteration shrinks.
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