paleolimbot commented on code in PR #13397:
URL: https://github.com/apache/arrow/pull/13397#discussion_r915904817
##########
r/src/compute-exec.cpp:
##########
@@ -109,9 +109,50 @@ std::shared_ptr<arrow::RecordBatchReader> ExecPlan_run(
auto kv = strings_to_kvm(metadata);
out_schema = out_schema->WithMetadata(kv);
}
- return compute::MakeGeneratorReader(
+
+ std::pair<std::shared_ptr<compute::ExecPlan>,
std::shared_ptr<arrow::RecordBatchReader>>
+ out;
+ out.first = plan;
+ out.second = compute::MakeGeneratorReader(
out_schema, [stop_producing, plan, sink_gen] { return sink_gen(); },
gc_memory_pool());
+ return out;
+}
+
+// [[arrow::export]]
+std::shared_ptr<arrow::RecordBatchReader> ExecPlan_run(
Review Comment:
Ok, this is slightly better now (it at least alerts the user to the fact
that a user-defined function is involved):
```
Error: NotImplemented: Call to R (resolve scalar user-defined function
output data type) from a non-R thread from an unsupported context
/Users/deweydunnington/Desktop/rscratch/arrow/cpp/src/arrow/compute/kernel.cc:391
resolver_(ctx, args)
...
```
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