Introduce SORTLIST function
---------------------------
Key: CORE-4520
URL: http://tracker.firebirdsql.org/browse/CORE-4520
Project: Firebird Core
Issue Type: New Feature
Reporter: Tim Kelly
It would be useful to have a built in function to sort a list, perhaps called
SORTLIST(aList, ASC | DESC). This would particularly useful when combined with
the aggregate LIST function.
SELECT SORTLIST('A, C, B') FROM RDB$DATABASE.... -> Should return CONSTANT:
"A, B, C"
Please note this would solve CORE-2332 as you could:
SELECT SORTLIST(LIST(MY_COL)) FROM ... to get a sorted version of an aggregated
list.
It would also solve CORE-2106:
SELECT HASH(SORTLIST(LIST(MY_COL))) FROM... to get a checksum based on an
aggrageted query (ie determine quickly if any of the value in MY_COL have
changed. This currently is not possible since the order that LIST returns is
undefined.
Would also be useful if we implemented CORE-4335. (non-aggregate version of
LIST (LISTVALUE())
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