LanguageConnectionContext lcc =
activation.getLanguageConnectionContext();
// Push the "authorization stack" of SQL 2003, vol 2, section
// 4.34.1.1 and 4.27.3.
lcc.pushCaller(activation);
// Copy the current role into top cell of stack. Activations
// inside nested connections look to this activation for
// keeping its current role rather than rely on what's in lcc
// (top level only).