Function DowncastInts

cpp/src/arrow/util/int_util.cc:386–388

}

void DowncastInts(const int64_t* source, int8_t* dest, int64_t length) {
  CastIntsInternal(source, dest, length);
}

void DowncastInts(const int64_t* source, int16_t* dest, int64_t length) {
  CastIntsInternal(source, dest, length);