gstvg commented on code in PR #21193:
URL: https://github.com/apache/datafusion/pull/21193#discussion_r3208874022
##########
datafusion/substrait/src/logical_plan/producer/expr/scalar_function.rs:
##########
@@ -35,7 +38,68 @@ pub fn from_higher_order_function(
fun: &expr::HigherOrderFunction,
schema: &DFSchemaRef,
) -> datafusion::common::Result<Expression> {
- from_function(producer, fun.name(), &fun.args, schema)
+ let mut lambda_parameters = fun.lambda_parameters(schema)?.into_iter();
+
+ let num_lambdas = fun
+ .args
+ .iter()
+ .filter(|arg| matches!(arg, Expr::Lambda(_)))
+ .count();
+
+ if lambda_parameters.len() != num_lambdas {
+ return substrait_err!(
+ "{} returned {} lambdas but {num_lambdas} expected",
+ fun.name(),
+ lambda_parameters.len()
+ );
+ }
+
+ let arguments = fun
+ .args
+ .iter()
+ .map(|arg| {
+ let arg = match arg {
+ Expr::Lambda(l) => {
+ let lambda_parameters =
+ lambda_parameters.next().ok_or_else(|| {
+ internal_datafusion_err!(
+ "lambda_parameters len should have been
checked above"
+ )
+ })?;
+
+ let named_lambda_parameters =
+ std::iter::zip(&l.params, lambda_parameters)
+ .map(|(name, parameter)| parameter.renamed(name))
+ .collect();
+
+ producer.push_lambda_parameters(named_lambda_parameters)?;
+
+ let arg = producer.handle_expr(arg, schema)?;
Review Comment:
Changed in
https://github.com/apache/datafusion/pull/21193/changes/9b6a8e1f18aadd976aaae9af40d7c7ca12095c96
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