target="eq_not_same_var"
>$target.sql
i=1
while [ $i -le 128 ]; do
	echo 'explain (summary) select a.reltype from pg_class_1 a, pg_class_2 b where a.reltype = b.reltype;' >> $target.sql 
	i=$((i + 1))
done

cat $target.sql|psql xman0 >$target.out 2>&1