This is the "grand finale" that goes on top of the "DROP FUNCTION of
multiple functions" patch set. The purpose is to allow referring to
functions without having to spell out the argument list, when the
function name is unique. This is especially useful when having to
operate on "business logic" functions with many many arguments. It's an
SQL standard feature, and it applies everywhere a function is referred
to in the grammar. We already have the lookup logic for the regproc
type, and thanks to the grand refactoring of the parser representation
of functions, this is quite a small patch. There is a bit of
reduce/reduce parser mystery, to keep the reviewer entertained. (The
equivalent could be implemented for aggregates and operators, but I
haven't done that here yet.)
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Peter Eisentraut http://www.2ndQuadrant.com/
PostgreSQL Development, 24x7 Support, Remote DBA, Training & Services