Re: [SQL] function expression in FROM may not refer to other relations of same query level

[Philippe Lang]

> > The problem now is that get_lines is being called twice per line.
> 
> Is get_lines() defined as IMMUTABLE?  Should it be?

I have tried defining get_lines as "IMMUTABLE", or "WITH (iscachable)",
but it keeps on getting called twice per line in the following query...

select
  id,
  usr,
  code,
  (get_lines(code)).line1,
  (get_lines(code)).line2
from tbl;

I wish there was a way to run the query like this:

select
  id,
  usr,
  code,
  CAST(get_lines(code) as lines)
from tbl;



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