On 05/08/2018 08:57 AM, Ildar Musin wrote: > > select map (pow(2, x) - 1 for x in array[1,2,3,4,5]);
I wonder how efficient an implementation would be possible strictly as a function, without grammar changes? While PostgreSQL certainly has extensions to and divergences from standard SQL syntax, some historical and some recent, it seems like there ought to be a highish bar for adding new ones; or, looking at it another way, has this feature been proposed to the SQL committee? It doesn't sound like a bad idea, and supporting new syntax for it would be an easier call it if it were known to be in an SQL draft somewhere. -Chap
