text: -- @Description Tests the behavior of full vacuum w.r.t. the pg_class statistics
  -- 
  
  -- ensure that the scan go through the index
  SET enable_seqscan=false;
  SELECT relname, reltuples FROM pg_class WHERE relname = 'foo';
  SELECT relname, reltuples FROM pg_class WHERE relname = 'foo_index';
  DELETE FROM foo WHERE a < 16;
  VACUUM FULL foo;
  SELECT relname, reltuples FROM pg_class WHERE relname = 'foo';
  SELECT relname, reltuples FROM pg_class WHERE relname = 'foo_index';
  