Separate lru for each argument value?

I need to write a sql database column getter, that takes in a column name and time, and returns the entire column of values for that column corresponding to the input time. This may be a frequent function call with the same arguments, so I would like to use an lru cache. However, I'm not sure if the frequency of the column names is uniformly distributed, so ideally, I would have a separate lru cache for each column name.

I previously had it like below, but I would like to separate the lru for each col_name.

@lru_cache(...)
def get_col(self, col_name, time)
  # do stuff to get the column and return it

How can I achieve this? Also, unfortunately, I have to support py2.

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