jorisvandenbossche commented on code in PR #14495:
URL: https://github.com/apache/arrow/pull/14495#discussion_r1017888011
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cpp/src/arrow/engine/substrait/expression_internal.cc:
##########
@@ -170,9 +170,10 @@ Result<compute::Expression> FromProto(const
substrait::Expression& expr,
out = compute::field_ref(FieldRef(*out_ref, index));
} else if (out->call() && out->call()->function_name ==
"struct_field") {
// Nested StructFields on top of an arbitrary expression
- std::static_pointer_cast<arrow::compute::StructFieldOptions>(
- out->call()->options)
- ->indices.push_back(index);
+ auto* field_options =
+
checked_cast<compute::StructFieldOptions*>(out->call()->options.get());
+ field_options->field_ref =
+ FieldRef(std::move(field_options->field_ref), index);
Review Comment:
in FromProto, I assume the indices will always be integers (since that's how
substrait's field references work?)
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