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Problems.

ClickHouse fails to return valid structured output

LLM apps2 posts from 1 person1d active+22 posts in the last 7 days, 0 the 7 days before (new)Unverified

Posts per day

Posts per day2 posts, Sep 22 to Sep 27

The posts behind it

2, newest first
PostDate
formatQueryFromJSON rejects parseQueryToJSON output for a partially named Tuple(...) type (empty element name)`formatQueryFromJSON` refuses `parseQueryToJSON`'s own output when a `Tuple(...)` type names only some of its elements. `ASTTupleDataType::writeJSON` writes empty names as they are, but `readJSON` throws for any empty name. ### Reproduce (release build) ### Cause...ClickHouse/ClickHouseqoegaSep 225 days ago
formatQueryFromJSON rejects parseQueryToJSON output for TTL expr GROUP BY without grouping keys`formatQueryFromJSON` refuses `parseQueryToJSON`'s own output for a `TTL expr GROUP BY` without grouping keys. `MergeTree` accepts an empty `GROUP BY` on a TTL element (aggregates the whole part), and the parser and formatter handle it, but the JSON reader rejects it. ###...ClickHouse/ClickHouseqoegaSep 225 days ago

Companies and products named

Company or productPosts naming it
ClickHouse2
About this problem

Evidence

2 posts from 1 person in 1 place, about 2 a week over 1 days. Mostly on ClickHouse/ClickHouse.

Frustration Frustration 3 of 3· Seen on GitHub issues

How it was grouped

Posts that state a pain and match the "structured-output" rule about ClickHouse. First post Sep 22, 2026, latest Sep 22, 2026. Unverified: fewer than 3 posts, or one person or place only. Method

History

  • 2026-09-27 Added: ClickHouse fails to return valid structured output (2 posts)

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