message: Executing UDF functions.
diff: #include "duckdb/execution/expression_executor.hpp"
  #include "duckdb/planner/expression/bound_function_expression.hpp"
  +#include <iostream>
  using namespace duckdb;
  using namespace std;
  @@ -42,7 +43,11 @@ void ExpressionExecutor::Execute(BoundFunctionExpression &expr, ExpressionState
  }
  arguments.Verify();
  }
  + if(expr.function.function) {
  expr.function.function(arguments, *state, result);
  + } else {
  + expr.function.udf_function(arguments, *state, result);
  + }
  if (result.type != expr.return_type) {
  throw TypeMismatchException(expr.return_type, result.type,
  "expected function to return the former "
  