This test will fail in "make installcheck" if the installation's
default_toast_compression setting is not 'pglz'.  Make it robust
against that situation.

Dilip Kumar

Discussion: https://postgr.es/m/CAFiTN-t0w+Rc2U3S+y=7KWcLuOYNB5MfWeGdNa7+pg0UovVdcQ@mail.gmail.com