On Sun, 2 Jul 2023 10:38:20 +0800 jian he <jian.universal...@gmail.com> wrote:
> ok. Now I really found a small bug. > > this works as intended: > BEGIN; > CREATE INCREMENTAL MATERIALIZED VIEW test_ivm AS SELECT i, MIN(j) as > min_j FROM mv_base_a group by 1; > INSERT INTO mv_base_a select 1,-2 where false; > rollback; > > however the following one: > BEGIN; > CREATE INCREMENTAL MATERIALIZED VIEW test_ivm1 AS SELECT MIN(j) as > min_j FROM mv_base_a; > INSERT INTO mv_base_a select 1, -2 where false; > rollback; > > will evaluate > tuplestore_tuple_count(new_tuplestores) to 1, it will walk through > IVM_immediate_maintenance function to apply_delta. > but should it be zero? This is not a bug because an aggregate without GROUP BY always results one row whose value is NULL. The contents of test_imv1 would be always same as " SELECT MIN(j) as min_j FROM mv_base_a;", isn't it? Regards, Yugo Nagata -- Yugo NAGATA <nag...@sraoss.co.jp>
