From "Sam Mason" <s...@samason.me.uk>:
>The nicer syntax to distinguish things is to use:
>
>  TYPENAME 'literal'

Thanks! That is very helpful. I saw that syntax in one example I found on the 
web, and incorrectly thought it was an alternate way of writing the function 
call.

The point of all this was to figure out a uniform syntax I can use for doing 
some type adapters to convert back and forth between Python objects and PG 
objects (through psycopg2 or some other Python-PG interface). Perhaps I should 
have mentioned that initially. I now see that the '{...}' notation does not do 
any evaluation of what's inside, e.g.

  SELECT '{1,2,1+2}'::INT[];

doesn't work, but

  SELECT ARRAY[1,2,1+2]::INT[];

works fine.

Dan



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