korowa commented on code in PR #11627:
URL: https://github.com/apache/datafusion/pull/11627#discussion_r1699512403


##########
datafusion/functions-aggregate/src/count.rs:
##########
@@ -433,6 +433,49 @@ 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));
+                builder.finish()
+            }
+            (Some(nulls), Some(filter)) => {
+                let mut builder = Int64Builder::with_capacity(values.len());
+                nulls.into_iter().zip(filter.iter()).for_each(
+                    |(is_valid, filter_value)| {
+                        builder.append_value(

Review Comment:
   I'd like to make these few changes in this PR (along with merging docs 
update and review suggestions) -- don't think it'll take long enough to 
accumulate any significant conflicts.



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