Following a discussion in the IRC channel, I'd like to suggest a feature
request to the ToDo WIKI page <https://wiki.postgresql.org/wiki/Todo>.

The use case is having a column with strings/floats, where some values are
very common and can be compressed, while many other values are unique,
making a lookup table not efficient.

It can be part of a column definition, set in CREATE TABLE/ALTER TABLE
e.g. field VARCHAR(255) COMPRESS (NULL, 'EREZ', 'SEGAL')

The feature exists in TeraData:

In the IRC channel - johto suggested an implementation:

<johto> if you want to get really fancy you could have two columns where
only one of set; one would be the value (if reasonably unique) and the
other the id (if not)
I'd like to add that an ENUM can be used instead of the id+lookup table in
the 2nd column for non unique values.

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