Function Decompose

cpp/src/gandiva/expr_decomposer.h:44–50

      : registry_(registry), annotator_(annotator), nested_if_else_(false) {}

  Status Decompose(const Node& root, ValueValidityPairPtr* out) {
    auto status = root.Accept(*this);
    if (status.ok()) {
      *out = std::move(result_);
    }
    return status;
  }

 private:
  ARROW_DISALLOW_COPY_AND_ASSIGN(ExprDecomposer);