proposal - psql - show longest tables

Hello all

I very often use a little bit adjusted psql system queries to
detection TOP N sized tables. I am thinking so it can be useful for
all users

I propose a few new commands

\dts [N|size] ... show N largest tables | show tables larger than size
ordered by size
\dis [N|size] ... show N largest indexes | show indexes larger than
size ordered by size
\dtst [N|size] ... show N largest total size | show tables where total
size is larger than size ordered by total size
\dtr [N] ... show N largest tables (ordered by rows)

example:

\dts 10 --- top 10 tables ordered by size
\dts 10MB -- tables larger than 10MB ordered by size

Schema | Name | Type | Owner | Size
--------+-------------+-------+-------------+-------+-------------
public | eshop_users | table | eshop_owner | 16 kB
public | zamestnanci | table | eshop_owner | 16 kB

What do you think about this proposal? Comments, notes?

Regards

Pavel Stehule