crepererum commented on code in PR #5377:
URL: https://github.com/apache/arrow-datafusion/pull/5377#discussion_r1116799043
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datafusion/physical-expr/src/aggregate/count_distinct.rs:
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@@ -216,23 +216,19 @@ impl Accumulator for DistinctCountAccumulator {
}
fn size(&self) -> usize {
+ // temporarily calculating the size approximately, taking first batch
size * number of batches
+ // such approach has some inaccuracy for variable length values, like
strings.
Review Comment:
This basically remove proper memory accounting for this operation and for
strings will likely be very wrong. I would rather see a proper cached size
accounting here.
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