Given a Delta Lake table with the following schema for user content post metadata:

user_id LONG, 
post_text STRING, 
post_id STRING, 
longitude FLOAT, 
latitude FLOAT, 
post_time TIMESTAMP, 
date DATE

user_id LONG, 
post_text STRING, 
post_id STRING, 
longitude FLOAT, 
latitude FLOAT, 
post_time TIMESTAMP, 
date DATE

Which column would be the most suitable for partitioning the Delta table?