Aggregate function not parallelizable ?

[jschaeff]

Hello, I'm trying to use timescaledb continuous aggregation with HLL on my database in postgresql 12.7:

 \dxe

     Nom     | Version |   Schéma   |                            Description                            
-------------+---------+------------+-------------------------------------------------------------------
 hll         | 2.15    | public     | type for storing hyperloglog data
 plpgsql     | 1.0     | pg_catalog | PL/pgSQL procedural language
 timescaledb | 2.3.0   | public     | Enables scalable inserts and complex queries for time-series data

CREATE MATERIALIZED VIEW sentdata_summary_daily
WITH (timescaledb.continuous) AS
SELECT network,
       time_bucket(INTERVAL '1 day', date) AS bucket,
       HLL_ADD_AGG(HLL_HASH_BIGINT(userid)) as users_set
FROM dataselectvol
GROUP BY network,bucket;
ERROR:  aggregates which are not parallelizable are not supported

But I thought from #73 that HLL functions were parallelisable.

Can you confirm that #73 is fixed in version 2.15 ? Do you think that the issue might be related to TimescaleDB ? Or am I misusing the hll_* functions ?