Method Finalize

cpp/src/arrow/compute/kernels/aggregate_basic.cc:124–140

  }

  Status Finalize(KernelContext* ctx, Datum* out) override {
    const auto& state = checked_cast<const CountImpl&>(*ctx->state());
    switch (state.options.mode) {
      case CountOptions::ONLY_VALID:
      case CountOptions::ALL:
        // ALL is equivalent since we don't count the null/non-null
        // separately to avoid potentially computing null count
        *out = Datum(state.non_nulls);
        break;
      case CountOptions::ONLY_NULL:
        *out = Datum(state.nulls);
        break;
      default:
        DCHECK(false) << "unreachable";
    }
    return Status::OK();
  }

  CountOptions options;
  int64_t non_nulls = 0;