Andrew Gierth wrote:
> >>>>> "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 about
> Bruce> what additional functionality we need once we get user
> Bruce> 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.
OK, so what should the TODO wording be?
-- Bruce Momjian <bruce@momjian.us> http://momjian.us EnterpriseDB
http://enterprisedb.com
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