Using callable statements against older server versions (7.4 or 8.0) did not work because of recent changes to output parameter handling. 7.4 and 8.0 do not support function output parameters, but they still must support the functions return value.  Every function must have either a return value or an output parameter so we force the minimum output parameter count to one.
Using callable statements against older server versions (7.4 or 8.0)
did not work because of recent changes to output parameter handling.
7.4 and 8.0 do not support function output parameters, but they
still must support the functions return value.  Every function must
have either a return value or an output parameter so we force the
minimum output parameter count to one.

tivv/davepgjdbc,tivv/davepgjdbc