ofBuiltinCodecs
Builds the dictionary the driver starts out with: one entry per codec it ships with an OID of its own.
There is one query that has to run before any catalog has been read - the read itself - and its columns are oid, name, char and int2, types the driver already names in the codecs it hardcodes them for. Every entry here is replaced by the real catalog entry as soon as build runs.
Parameters
codecs
the codec dictionary to take the names and OIDs from.