You need the encoding ID before you have a system to have tables in - while you are running the bootstrap code - unless things change.About pg_encoding. There is currently no way to tell whether an encoding exists. Normally you would put this kind of thing into a system table, but doing that is a bit tricky with the encodings. I would like to see pg_encoding go, so let's hear what information people need and give them a direct way to access it.
That isn't to say that putting the available encodings into a table isn't a good idea, though.
I'm not sure I see anywhere in the docs a ref to what encodings are available, or how to find that out - if I haven't missed it that's something to be remedied.
cheers
andrew
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