cpp/src/gandiva/decimal_scalar.h

// Licensed to the Apache Software Foundation (ASF) under one
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// to you under the Apache License, Version 2.0 (the
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//
//   http://www.apache.org/licenses/LICENSE-2.0
//
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#pragma once

#include <cstdint>
#include <iostream>
#include <string>
#include "arrow/util/decimal.h"
#include "gandiva/basic_decimal_scalar.h"

namespace gandiva {

using Decimal128 = arrow::Decimal128;

/// Represents a 128-bit decimal value along with its precision and scale.
///
/// BasicDecimalScalar128 can be safely compiled to IR without references to libstdc++.
/// This class has additional functionality on top of BasicDecimalScalar128 to deal with
/// strings and streams.
class DecimalScalar128 : public BasicDecimalScalar128 {
 public:
  using BasicDecimalScalar128::BasicDecimalScalar128;

  DecimalScalar128(const std::string& value, int32_t precision, int32_t scale)
      : BasicDecimalScalar128(Decimal128(value), precision, scale) {}

  /// \brief constructor creates a DecimalScalar128 from a BasicDecimalScalar128.
  constexpr DecimalScalar128(const BasicDecimalScalar128& scalar) noexcept
      : BasicDecimalScalar128(scalar) {}

  inline std::string ToString() const {
    Decimal128 dvalue(value());
    return dvalue.ToString(0) + "," + std::to_string(precision()) + "," +
           std::to_string(scale());
  }

  friend std::ostream& operator<<(std::ostream& os, const DecimalScalar128& dec) {
    os << dec.ToString();
    return os;
  }
};

}  // namespace gandiva