Function FieldsInExpression

cpp/src/arrow/compute/expression.cc:813–826

}  // namespace

std::vector<FieldRef> FieldsInExpression(const Expression& expr) {
  if (expr.literal()) return {};

  if (auto ref = expr.field_ref()) {
    return {*ref};
  }

  std::vector<FieldRef> fields;
  for (const Expression& arg : CallNotNull(expr)->arguments) {
    auto argument_fields = FieldsInExpression(arg);
    std::move(argument_fields.begin(), argument_fields.end(), std::back_inserter(fields));
  }
  return fields;
}

bool ExpressionHasFieldRefs(const Expression& expr) {
  if (expr.literal()) return false;