[GitHub] [arrow] icexelloss commented on a diff in pull request #34288: GH-34122: [C++] Allow calling function registry functions without requiring a Substrait mapping

["icexelloss (via GitHub)" <gi...@apache.org>]

icexelloss commented on code in PR #34288:
URL: https://github.com/apache/arrow/pull/34288#discussion_r1114591126


##########
cpp/src/arrow/engine/substrait/function_test.cc:
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@@ -188,6 +188,12 @@ TEST(FunctionMapping, ValidCases) {
        {int8(), int8()},
        "-119",
        int8()},
+      {{kArrowSimpleExtensionFunctionsUri, "add_checked"},

Review Comment:
   I wonder if this also works for UDFs? e.g., if I register a Python UDF by name "my_func", I can also use the same `::arrow::compute::call` to invoke it via `kSimpleSubstraitToArrow` or is there more to it?



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