>>>>> "Bruce" == Bruce Momjian <bruce@momjian.us> writes:
>> The unnest() implementation is largely unrelated to the standard>> one, which is impossible to provide without
LATERAL.
Bruce> I removed the duplicate item; we can add more details aboutBruce> what additional functionality we need once we
getuserBruce> feedback.
The missing functionality from the spec is:
1) select ... from foo, unnest(foo.bar); -- UNNEST is implicitly LATERAL
2) multiple arrays: select * from unnest(a,b);
3) expansion of composite arrays: unnest(a) should return as many
columns as there are in the elements of a, not just one composite
column
4) WITH ORDINALITY - adds a column to the result with the array index
It's point (1) that's the killer - without it, unnest() is just a
trivial shorthand for stuff that can be done anyway; it doesn't
actually add any functionality.
--
Andrew.