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Bug: Async UDFs cannot be used as inputs to aggregation functions

Bug: Async UDFs cannot be used as inputs to aggregation functions: a task in LegoFlow-SWE (Harbor dataset). When an async UDF is used as an argument to an aggregation function, the query fails with an unhelpful error, even though the same UDF works correctly in projection lists and WHERE clauses…

The task

When an async UDF is used as an argument to an aggregation function, the query fails with an unhelpful error, even though the same UDF works correctly in projection lists and `WHERE` clauses. For example, given an async UDF `async_abs` that computes the absolute value asynchronously, the following queries fail:

Part of Lego-X/LegoFlow-SWE.