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Implement ANY_VALUE aggregate

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SQL:2023 defines an ANY_VALUE aggregate whose purpose is to emit an
implementation-dependent (i.e. non-deterministic) value from the
aggregated rows.

Author: Vik Fearing <vik@postgresfriends.org>
Reviewed-by: Peter Eisentraut <peter.eisentraut@enterprisedb.com>
Reviewed-by: David Rowley <dgrowleyml@gmail.com>
Discussion: https://www.postgresql.org/message-id/flat/5cff866c-10a8-d2df-32cb-e9072e6b04a2@postgresfriends.org
This commit is contained in:
Peter Eisentraut
2023-02-22 09:32:12 +01:00
parent 7e5ddf7e4d
commit 2ddab010c2
8 changed files with 74 additions and 1 deletions
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9
src/backend/utils/adt/misc.c
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@@ -1041,3 +1041,12 @@ pg_get_replica_identity_index(PG_FUNCTION_ARGS)
else
PG_RETURN_NULL();
}
/*
* Transition function for the ANY_VALUE aggregate
*/
Datum
any_value_transfn(PG_FUNCTION_ARGS)
{
PG_RETURN_DATUM(PG_GETARG_DATUM(0));
}