alamb commented on code in PR #9686:
URL: https://github.com/apache/arrow-datafusion/pull/9686#discussion_r1530501984
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datafusion/physical-plan/src/windows/mod.rs:
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@@ -174,20 +174,15 @@ fn create_built_in_window_expr(
name: String,
ignore_nulls: bool,
) -> Result<Arc<dyn BuiltInWindowFunctionExpr>> {
- // need to get the types into an owned vec for some reason
- let input_types: Vec<_> = args
- .iter()
- .map(|arg| arg.data_type(input_schema))
- .collect::<Result<_>>()?;
+ // derive the output datatype from incoming schema
+ let out_data_type: &DataType =
input_schema.field_with_name(&name)?.data_type();
- // figure out the output type
- let data_type = &fun.return_type(&input_types)?;
Ok(match fun {
- BuiltInWindowFunction::RowNumber => Arc::new(RowNumber::new(name,
data_type)),
- BuiltInWindowFunction::Rank => Arc::new(rank(name, data_type)),
- BuiltInWindowFunction::DenseRank => Arc::new(dense_rank(name,
data_type)),
- BuiltInWindowFunction::PercentRank => Arc::new(percent_rank(name,
data_type)),
- BuiltInWindowFunction::CumeDist => Arc::new(cume_dist(name,
data_type)),
+ BuiltInWindowFunction::RowNumber => Arc::new(RowNumber::new(name,
out_data_type)),
Review Comment:
I find it strange in general that we have to pass a "output type" to
`RowNumber` when it is (effectively) always the same.
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