never did inflateEnd, thus leaking some tens of KB per call.  Which
added up *real fast* when dealing with, say, thousands of BLOBs.
Thanks to Lane Rollins for the bug report.

documentation of pg_select command.

Laser.

Please check compile errors before you commit!

member offset.

per bug report from Stefan Hadjistoytchev.  There are some cases
where the dot notation works, but there are more where it doesn't.
Eventually ought to consider fixing the parser to allow cases like
func().field, but for now this is the simplest patch.