rluvaton commented on code in PR #21679:
URL: https://github.com/apache/datafusion/pull/21679#discussion_r3094872465
##########
datafusion/physical-expr/src/planner.rs:
##########
@@ -399,6 +404,100 @@ pub fn create_physical_expr(
Expr::Placeholder(Placeholder { id, .. }) => {
exec_err!("Placeholder '{id}' was not provided a value for
execution.")
}
+ Expr::HigherOrderFunction(invocation @ HigherOrderFunction { func,
args }) => {
+ let num_lambdas = args
+ .iter()
+ .filter(|arg| matches!(arg, Expr::Lambda(_)))
+ .count();
+
+ let mut lambda_parameters =
+ invocation.lambda_parameters(input_dfschema)?.into_iter();
+
+ if num_lambdas > lambda_parameters.len() {
+ return plan_err!(
+ "{} lambda_parameters returned only {} values for
{num_lambdas} lambdas",
+ func.name(),
+ lambda_parameters.len()
+ );
+ }
+
+ let physical_args = args
+ .iter()
+ .map(|arg| match arg {
+ Expr::Lambda(lambda) => {
+ let lambda_parameters = lambda_parameters
+ .next()
+ .ok_or_else(|| {
+ internal_datafusion_err!(
+ "lambda_parameters len should have been
checked above"
+ )
+ })?
+ .into_iter()
+ .zip(&lambda.params)
+ .map(|(field, name)| field.with_name(name))
+ .collect();
+
+ let lambda_schema = DFSchema::from_unqualified_fields(
+ lambda_parameters,
+ HashMap::new(),
+ )?;
+
+ create_physical_expr(arg, &lambda_schema,
execution_props)
+ }
+ _ => create_physical_expr(arg, input_dfschema,
execution_props),
+ })
+ .collect::<Result<_>>()?;
+
+ let config_options = match execution_props.config_options.as_ref()
{
+ Some(config_options) => Arc::clone(config_options),
+ None => Arc::new(ConfigOptions::default()),
+ };
+
+ Ok(Arc::new(HigherOrderFunctionExpr::try_new(
+ Arc::clone(func),
+ physical_args,
+ input_schema,
+ config_options,
+ )?))
+ }
+ Expr::Lambda(Lambda { params, body }) => {
+ if body.any_column_refs() {
+ return plan_err!("lambda doesn't support column capture");
Review Comment:
please add a link to the issue that talk about column capture in lambda
support
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