jayzhan211 commented on code in PR #12996:
URL: https://github.com/apache/datafusion/pull/12996#discussion_r1826380362
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datafusion/physical-plan/src/aggregates/group_values/mod.rs:
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@@ -143,8 +148,12 @@ pub fn new_group_values(schema: SchemaRef) ->
Result<Box<dyn GroupValues>> {
}
}
- if GroupValuesColumn::supported_schema(schema.as_ref()) {
- Ok(Box::new(GroupValuesColumn::try_new(schema)?))
+ if column::supported_schema(schema.as_ref()) {
Review Comment:
> Is it because the VectorizedGroupValuesColumn doesn't keep the groups in
order?
Yes, because we iterate all the rows at once, some rows are appended
beforehand so they are not kept in order.
> If that is the case, it seems like maybe emit_n would never be called
`emit_early_if_necessary` may be called
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