Function isDecimal64

c++/src/ConvertColumnReader.cc:1242–1244

  const static int32_t MAX_PRECISION_64 = 18;

  static inline bool isDecimal64(const Type& type) {
    return type.getPrecision() > 0 && type.getPrecision() <= MAX_PRECISION_64;
  }

#define CASE_CREATE_FROM_DECIMAL_READER(TYPE, TO)   \
  case TYPE: {                                      \