add 'unnest' table function

[l1t1]

Is your feature request related to a problem or challenge?

the 'unnest' table function reads an array or list, and out put a table

Describe the solution you'd like

the result is same as that of postgresql

select unnest(ARRAY[1,2,3]);
 unnest
--------
      1
      2
      3

select * from unnest(ARRAY[1,2,3]);
 unnest
--------
      1
      2
      3

Describe alternatives you've considered

No response

Additional context

No response