Dandandan commented on code in PR #5377:
URL: https://github.com/apache/arrow-datafusion/pull/5377#discussion_r1118542856
##########
datafusion/physical-expr/src/aggregate/count_distinct.rs:
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@@ -149,6 +149,43 @@ impl DistinctCountAccumulator {
self.update(&row_values)
})
}
+
+ // calculating the size approximately, taking first batch size * number of
batches
+ // approx_size has some inaccuracy for variable length values, like
strings.
+ fn approx_size(&self) -> usize {
Review Comment:
This shouldn't be approximate now, as we only do it for fixed types
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