Problemsby GlyphTrouble with ClickHouse return
3 posts from 3 people3d activeSteady, +1 this week
Posts per day
The posts behind it
Docs: h3GetResolution incorrectly says invalid indexes return a random value
### Describe the issue The manual H3 function reference says that `h3GetResolution` returns a random value when the input is not a valid H3 index: https://github.com/ClickHouse/ClickHouse/blob/master/docs/reference/functions/regular-functions/geo/h3.mdx#L69 The current...
Five Trino aliases return non-Trino results
### Describe what's wrong - `to_base64url`, `url_encode`, `url_extract_host`, `url_extract_protocol` and `slice` diverge from Trino semantics. - Triggered by running Trino's own test vectors for these functions on ClickHouse. - Each alias silently returns a different value...
substring with a constant offset 0 throws on a non-constant string, other argument shapes return an empty string
### Describe what's wrong `substring(s, 0, len)` throws `Indices in strings are 1-based` when `s` is a column and the offset is a constant. With a constant string, or with the offset as a column, the same call returns an empty string, which is what the documentation says. -...
Companies and products named
About this problem
Evidence
3 posts from 3 people in 1 place, about 1 a week over 23 days. Mostly on ClickHouse/ClickHouse. Tools named alongside: GitHub, Trino.
Frustration Frustration 0 of 3· Seen on GitHub issues
How it was grouped
Posts about ClickHouse with no known issue, sharing the word "return". First post Oct 4, 2026, latest Oct 26, 2026. Corroborated: 3 or more posts from 2 or more people or places. Method
Other ClickHouse problems
ClickHouse users keep filing bugs
Top post: "Tighten seccomp policy for optional kernel interfaces", one of 35 posts from 13 people on GitHub issues.
Trouble with ClickHouse table
Top post: "`SYSTEM RESTORE REPLICA` on a second replica over-bumps the table `metadata` znode version; every later", one of 7 posts from 5 people on GitHub issues.
ClickHouse upgrades break working setups
23 posts from 14 people on GitHub issues.
ClickHouse costs outgrow the value it gives
9 posts from 3 people on GitHub issues.
Trouble with ClickHouse database
Top post: "`DROP NAMED COLLECTION` succeeds while a database uses the collection, and the server then fails to start", one of 6 posts from 2 people on GitHub issues.
Experiments on ClickHouse are hard to reproduce and track
7 posts from 1 person on GitHub issues. Unverified.
ClickHouse error messages are cryptic
5 posts from 3 people on GitHub issues.
Trouble with ClickHouse read
Top post: "ORC: a corrupt PostScript `metadata_length` makes ORC predicate pushdown read `stripe_stats` out of bounds,", one of 4 posts from 4 people on GitHub issues.
Trouble with ClickHouse join
Top post: "Explicit grace_hash now spills at max_bytes_ratio_before_external_join = 0.5 although the build side fits in", one of 4 posts from 3 people on GitHub issues.
Trouble with ClickHouse name
Top post: "SIGSEGV reading a `7z` archive entry without a name", one of 3 posts from 2 people on GitHub issues.
ClickHouse rate limits and usage caps block work
3 posts from 3 people on GitHub issues.
Trouble with ClickHouse merge
Top post: "GROUP BY over a near-unique key with ORDER BY count() DESC LIMIT n: bound group counts before counting them", one of 3 posts from 2 people on GitHub issues.
History