Patch: UNNEST (and other functions) WITH ORDINALITY

Folks,

Please find attached a patch which implements the SQL standard
UNNEST() WITH ORDINALITY. It doesn't stop there. Any function call
in a FROM clause can now take WITH ORDINALITY, which appends a counter
(ordinality) column to the columns the function outputs and produce
results like this:

postgres(at)postgres:5493=# select * FROM pg_ls_dir('.') WITH ORDINALITY AS t(ls,n);
ls | n
-----------------+----
pg_serial | 1
pg_twophase | 2
postmaster.opts | 3
pg_notify | 4
postgresql.conf | 5
pg_tblspc | 6
logfile | 7
base | 8
postmaster.pid | 9
pg_ident.conf | 10
global | 11
pg_clog | 12
pg_snapshots | 13
pg_multixact | 14
PG_VERSION | 15
pg_xlog | 16
pg_hba.conf | 17
pg_stat_tmp | 18
pg_subtrans | 19
(19 rows)

TBD: polish the docs, add regression tests, possibly add psql support.

Thanks to Andrew (RhodiumToad) Gierth for the hard work designing and
implementing this feature.

Tom, is there some better way to do this?

Cheers,
David.
--
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