We’re experiencing an intermittent issue with aggregation queries on compressed data in TimescaleDB (versions 2.16 and 2.17). Specifically, when querying a single id_number
from a compressed hypertable and selecting a time period for more than a week, we encounter an error. However, this error does not occur when the query includes multiple id_number
values. We have two seemingly identical environments, but only one of them exhibits this behavior.
Error Message:
ERROR: aggregated compressed column not found
DETAIL: Assertion ‘value_column_description != NULL’ failed.
Environment Details:
- Operating System: Ubuntu 22.04
- PostgreSQL Version: 16.4
- TimescaleDB Version: Tested on 2.16 and 2.17
Steps to Reproduce:
- Set up compressed hypertable:
- Create a hypertable (e.g.,
data_5min
) with compression enabled. - Insert sample data and ensure the table has multiple chunks.
- Run Query:
- Single ID (FAILS)
SELECT
id_number AS idNumber,
AVG("value") AS "value",
time_bucket('6 hour', ts) AS timeBucket
FROM
data_5min
WHERE
id_number IN (10)
AND ts >= '2024-10-15 00:00:00'
AND ts < '2024-10-27 00:00:00'
GROUP BY
id_number, timeBucket
ORDER BY
timeBucket;
- Multiple ID (WORKS)
SELECT
id_number AS idNumber,
AVG("value") AS "value",
time_bucket('6 hour', ts) AS timeBucket
FROM
data_5min
WHERE
id_number IN (10, 20)
AND ts >= '2024-10-15 00:00:00'
AND ts < '2024-10-27 00:00:00'
GROUP BY
id_number, timeBucket
ORDER BY
timeBucket;
Additional Information:
This error does not appear in an identical environment running TimescaleDB 2.16.
Verified that compression was enabled and checked chunk statuses.
Expected Behavior:
The query with a single id_number
should execute without errors, as it does when querying with multiple IDs.
9 posts - 3 participants