Problemsby GlyphTrouble with Apache Iceberg tables
3 posts from 3 people3d activeFading, +0 this week
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Iceberg tables are much slower than MergeTree in the performance tests: subcolumns, sort order, join planning, position deletes
The new Iceberg configuration of the performance tests (https://github.com/ClickHouse/ClickHouse/pull/128261) runs 282 perf tests a second time with their MergeTree tables created as Iceberg tables, on the same binary and runner type. This issue collects the cases where an...
Core: TableMetadata.Builder allows adding encryption keys to v1/v2 tables
### Apache Iceberg version main (development) ### Query engine Other ### Please describe the bug 🐞 `encryption-keys` is v3-only, but [`TableMetadata.Builder.addEncryptionKey`](https://github.com/apache/iceberg/blob/fb58513787756dedab6550d6695df36a27acb64e/core/src/main/java/org/...
Core: RewriteManifests.addManifest mishandles v1-format manifests on v2+ tables
### Apache Iceberg version main (development). Reproduced at db43b88a6c; the same code paths are in 1.12.0 (latest release). ### Query engine None (core API). ### Please describe the bug 🐞 `RewriteManifests.addManifest` does not check the format version of the manifest it is...
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About this problem
Evidence
3 posts from 3 people in 2 places, about 1 a week over 19 days. Mostly on apache/iceberg, ClickHouse/ClickHouse. Tools named alongside: GitHub, ClickHouse.
Frustration Frustration 2 of 3· Seen on GitHub issues
How it was grouped
Posts about Apache Iceberg with no known issue, sharing the word "tables". First post Oct 13, 2026, latest Oct 31, 2026. Corroborated: 3 or more posts from 2 or more people or places. Method
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History