Here is another idea for a contribution - refactoring.
Currently there are a lot of procedures in PostgreSQL code that
definitely don't fit on one screen (i.e. ~50 lines). Also many files are
larger than say 1000 lines of code. For instance, psql_completion
procedure is more than 2000 lines long! I think patches that would make
such code easier to read would have a good chance to be accepted.
In case you are interested I wrote a script that scans PostgreSQL code
and then prints procedures names and corresponding number of lines of
code (see attachment).
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Best regards,
Aleksander Alekseev