Jimexist commented on a change in pull request #687:
URL: https://github.com/apache/arrow-datafusion/pull/687#discussion_r665066286
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File path: datafusion/src/physical_plan/windows.rs
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@@ -110,13 +110,49 @@ fn create_built_in_window_expr(
let coerced_args = coerce(args, input_schema,
&signature_for_built_in(fun))?;
let arg = coerced_args[0].clone();
let data_type = args[0].data_type(input_schema)?;
- Arc::new(lag(name, data_type, arg))
+ let shift_offset = coerced_args
+ .get(1)
+ .map(|v| {
+ v.as_any()
+ .downcast_ref::<Literal>()
+ .unwrap()
+ .value()
+ .clone()
+ .try_into()
+ })
+ .and_then(|v| v.ok());
+ let default_value = coerced_args.get(2).map(|v| {
+ v.as_any()
+ .downcast_ref::<Literal>()
+ .unwrap()
+ .value()
+ .clone()
+ });
+ Arc::new(lag(name, data_type, arg, shift_offset, default_value))
}
BuiltInWindowFunction::Lead => {
let coerced_args = coerce(args, input_schema,
&signature_for_built_in(fun))?;
let arg = coerced_args[0].clone();
let data_type = args[0].data_type(input_schema)?;
- Arc::new(lead(name, data_type, arg))
+ let shift_offset = coerced_args
+ .get(1)
+ .map(|v| {
+ v.as_any()
Review comment:
feel like you can have a helper function to extract argument as
`Result<Literal>`
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