Bigtable docs say:
By reversing the timestamp, you can design a row key where the most recent event appears at the start of the table instead of the end. As a result, you can get the N most recent events simply by retrieving the first N rows of the table.
My understanding is that assuming tables are sorted in ascending order then regular timestamp will mean recent events will be at the end of the table since those values increase whereas reverse timestamp will mean recent events will be at the beginning of the table since those values will decrease. My understanding is that this reverse timestamp design leverages sorting on the row key of the table.
Why is there a benefit for sorting ascending as opposed to descending - is the ascending sort the only type of sort supported in bigtable? Are "My understanding"s above correct?