[GitHub] [arrow] zenithyr commented on issue #36782: [C++] cast arrow::Array to user defined structs

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

zenithyr commented on issue #36782:
URL: https://github.com/apache/arrow/issues/36782#issuecomment-1643449902

   It turns out the `struct_field` function in `arrow::compute` can help.
   ```cpp
   arrow::Datum datum;
   arrow::compute::StructFieldOptions options;
   ARROW_ASSIGN_OR_RAISE(datum, arrow::compute::CallFunction("struct_field", {col3}, &options));
   auto struct_array = datum.array_as<arrow::StructArray>();
   auto f0 = struct_array->field(0);
   auto& id = static_cast<arrow::Int32Array&>(*f0);
   ```
   
   Still figuring out how to read the nested list...


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