
The macro is being applied to a TOAST pointer, not a varlena header. Therefore the use of VARATT_IS_COMPRESSED() is wrong. We can check VARATT_EXTERNAL_IS_COMPRESSED(), but then we don't need the length check that follows. Report and fix by Kyotaro Horiguchi. Discussion: http://postgr.es/m/20220517.162719.1671558681467343711.horikyota.ntt@gmail.com