These were never implemented. Likely because they aren't used
internally by Calc, which for formula expressions in the
interpreter and for DataPilot / pivot table uses a different
approach, but they are needed for
css::sheet::XSheetOperation::computeFunction()

Change-Id: I1af038bf9db8d0c04d69598b992b827b083e2248
Reviewed-on: https://gerrit.libreoffice.org/64957Reviewed-by: Eike Rathke <erack@redhat.com>
Tested-by: Jenkins