Antalya 26.3 forward-port: Hybrid tables

[zvonand]

Changelog category (leave one):

• New Feature

Changelog entry (a user-readable short description of the changes that goes to CHANGELOG.md):

#1071
#1156
#1272 (#1442 by @filimonov).

CI/CD Options

Exclude tests:

• Fast test
• Integration Tests
• Stateless tests
• Stateful tests
• Performance tests
• All with ASAN
• All with TSAN
• All with MSAN
• All with UBSAN
• All with Coverage
• All with Aarch64
• All Regression
• Disable CI Cache

Regression jobs to run:

• Fast suites (mostly <1h)
• Aggregate Functions (2h)
• Alter (1.5h)
• Benchmark (30m)
• ClickHouse Keeper (1h)
• Iceberg (2h)
• LDAP (1h)
• Parquet (1.5h)
• RBAC (1.5h)
• SSL Server (1h)
• S3 (2h)
• S3 Export (2h)
• Swarms (30m)
• Tiered Storage (2h)

Cherry-picked from #1442.

[github-actions]

Workflow [PR], commit [a205fc0]

[zvonand]

RelEasy analyze-fails — DONE

run completed at 2026-04-27T15:46:38Z

• Head SHA: b2fed58ed8 (feature/antalya-26.3/pr-1442)
• Tests considered: 2 across 1 CI shard(s)
• Outcomes: 1 done · 0 partial · 0 unrelated · 0 unresolved
• Commits added by AI: 1 (✅ pushed)
• Anthropic cost: $3.1529

Per-shard outcomes

✅ DONE — Fast test

2 failed test(s) considered — +1 commit(s) — cost $3.1529
full report

AI narration

Build succeeded. Now let me run the failing test.
The fix works. All __ prefixed functions, including __aliasMarker, now have category Internal. Let me commit and then deal with the second test.

Summary

Root cause: PR #1442 added __aliasMarker, registered with FunctionDocumentation::Category::Other. The test 03921_internal_functions_have_internal_category asserts every function with the __ prefix has Category::Internal, so it failed (throwIf(notEquals(__table1.categories, 'Internal')).

Fix: in src/Functions/identity.cpp:50, changed .category = FunctionDocumentation::Category::Other to .category = FunctionDocumentation::Category::Internal. Verified via clickhouse local --query "SELECT name, categories FROM system.functions WHERE startsWith(name, '__')": __aliasMarker now reports Internal alongside the other internal __ functions.

The clickhouse-test entry is the umbrella job-status label that flips whenever any individual stateless test fails in the Fast test shard; it shares the same root cause.

• 03921_internal_functions_have_internal_category [fixed]
• clickhouse-test [fixed]

DONE

Summary

Root cause: PR #1442 added __aliasMarker, registered with FunctionDocumentation::Category::Other. The test 03921_internal_functions_have_internal_category asserts every function with the __ prefix has Category::Internal, so it failed (throwIf(notEquals(__table1.categories, 'Internal')).

Fix: in src/Functions/identity.cpp:50, changed .category = FunctionDocumentation::Category::Other to .category = FunctionDocumentation::Category::Internal. Verified via clickhouse local --query "SELECT name, categories FROM system.functions WHERE startsWith(name, '__')": __aliasMarker now reports Internal alongside the other internal __ functions.

The clickhouse-test entry is the umbrella job-status label that flips whenever any individual stateless test fails in the Fast test shard; it shares the same root cause.

• 03921_internal_functions_have_internal_category [fixed]
• clickhouse-test [fixed]

DONE

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