Failure: /iceberg/iceberg engine/rest catalog/show_data_lake_catalogs hint — empty SHOW TABLES on non-Antalya and <26.1 CI

Affected tests

• /iceberg/iceberg engine/rest catalog/show_data_lake_catalogs hint/*

Affected files

• iceberg/tests/iceberg_engine/show_data_lake_catalogs_repro.py
• iceberg/regression.py

Summary

The similar_table_names_hint scenario expects that, with show_data_lake_catalogs_in_system_tables = 0, tables stay out of system.tables but SHOW TABLES FROM still lists names like schema1.table. On non-Antalya builds and ClickHouse < 26.1, SHOW TABLES FROM returned empty output, so assertions such as assert f"{namespace}.{table_name}" in result.output failed in CI.

Description

The scenario was added on 2026-03-27 in 8d10a5bcc (Add new test for show_data_lake_catalogs hint behavior). After that, Iceberg CI on binaries other than Antalya 26.1+ began failing on this subtree: system.tables behaved as expected (no catalog tables), but SHOW TABLES FROM produced no rows in the client output.

Analysis

Root cause

The behavior under test comes from Antalya 26.1 work on DataLakeCatalog and UNKNOWN_TABLE / typo hints when show_data_lake_catalogs_in_system_tables is disabled—Altinity/ClickHouse#1583 (backport of ClickHouse/ClickHouse#100452).

Follow-up (when upstream lands)

After ClickHouse#100452 merges and the behavior exists in a known upstream version, revisit the skip in iceberg/regression.py: tighten check_clickhouse_version and drop check_if_not_antalya_build() if it is no longer required.

Resolution

Skip this subtree unless Antalya and ClickHouse ≥ 26.1:

• 9ab8a01 — Skip show_data_lake_catalogs hint tests outside Antalya 26.1+

References

• Test introduction: 8d10a5bcc
• Antalya backport: Altinity/ClickHouse#1583
• Upstream PR: ClickHouse/ClickHouse#100452