Dandandan commented on code in PR #5408:
URL: https://github.com/apache/arrow-datafusion/pull/5408#discussion_r1121835138
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datafusion/physical-expr/src/aggregate/count_distinct.rs:
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@@ -30,36 +30,29 @@ use datafusion_common::ScalarValue;
use datafusion_common::{DataFusionError, Result};
use datafusion_expr::Accumulator;
-#[derive(Debug, PartialEq, Eq, Hash, Clone)]
-struct DistinctScalarValues(Vec<ScalarValue>);
+type DistinctScalarValues = ScalarValue;
/// Expression for a COUNT(DISTINCT) aggregation.
#[derive(Debug)]
pub struct DistinctCount {
/// Column name
name: String,
- /// The DataType for the final count
- data_type: DataType,
/// The DataType used to hold the state for each input
- state_data_types: Vec<DataType>,
+ state_data_types: DataType,
Review Comment:
```suggestion
state_data_type: DataType,
```
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