pg_null_as_free  4165 ext/pgsql/pgsql.c 	int  pg_null_as_free = 0;
pg_null_as_free  4184 ext/pgsql/pgsql.c 		pg_null_as_free = 1;
pg_null_as_free  4195 ext/pgsql/pgsql.c 	if (pg_null_as_free) {