korowa commented on code in PR #11627:
URL: https://github.com/apache/datafusion/pull/11627#discussion_r1695654358
##########
datafusion/functions-aggregate/src/count.rs:
##########
@@ -432,6 +432,49 @@ impl GroupsAccumulator for CountGroupsAccumulator {
Ok(vec![Arc::new(counts) as ArrayRef])
}
+ fn convert_to_state(
+ &self,
+ values: &[ArrayRef],
+ opt_filter: Option<&BooleanArray>,
+ ) -> Result<Vec<ArrayRef>> {
+ let values = &values[0];
+
+ let state_array = match (values.logical_nulls(), opt_filter) {
+ (Some(nulls), None) => {
+ let mut builder = Int64Builder::with_capacity(values.len());
+ nulls
+ .into_iter()
+ .for_each(|is_valid| builder.append_value(is_valid as
i64));
Review Comment:
FWIW: `into_iter().map().collect::<Int64Array>()` seems to be slower than
appending values to the builder :thinking:
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