arrow::Status Visit()

in src/afs.cc [975:1001]

• 26 lines of code
• 5 McCabe index (conditional complexity)

	arrow::Status Visit(const arrow::TimestampArray& array)
	{
		const auto unit =
			std::static_pointer_cast<arrow::TimestampType>(array.type())->unit();
		Timestamp value = 0;
		switch (unit)
		{
			case arrow::TimeUnit::SECOND:
				value += array.Value(i_row_) * 1000000;
				break;
			case arrow::TimeUnit::MILLI:
				value += array.Value(i_row_) * 1000;
				break;
			case arrow::TimeUnit::MICRO:
				value += array.Value(i_row_);
				break;
			case arrow::TimeUnit::NANO:
				value += array.Value(i_row_) / 1000;
				break;
			default:
				return arrow::Status::NotImplemented("Unsupported time unit: ", unit);
		}
		// Arrow uses UNIX epoch (1970-01-01) but PostgreSQL uses 2000-01-01.
		value -= (POSTGRES_EPOCH_JDATE - UNIX_EPOCH_JDATE) * USECS_PER_DAY;
		datum_ = TimestampGetDatum(value);
		return arrow::Status::OK();
	}