Fix possible logical error during reading Map subcolumns

[Avogar]

Changelog category (leave one):

• Bug Fix (user-visible misbehavior in an official stable release)

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

Fix possible logical error during reading Map subcolumns. Closes #100769. Closes #101336

Documentation entry for user-facing changes

• Documentation is written (mandatory for new features)

[clickhouse-gh]

Workflow [PR], commit [6bae80a]

Summary: ❌

job_name	test_name	status	info	comment
Stateless tests (arm_binary, parallel)		failure
	04092_tcp_settings_parse_error_closes_connection	FAIL	cidb
Integration tests (amd_asan_ubsan, db disk, old analyzer, 1/6)		failure
	test_database_iceberg_nessie_catalog/test.py::test_select	FAIL	cidb
	test_database_iceberg_nessie_catalog/test.py::test_tables_with_same_location	FAIL	cidb
	test_database_iceberg_nessie_catalog/test.py::test_timestamps	FAIL	cidb
	test_database_iceberg_nessie_catalog/test.py::test_insert	FAIL	cidb
Integration tests (amd_asan_ubsan, db disk, old analyzer, 6/6)		failure
	test_database_iceberg_lakekeeper_catalog/test.py::test_select	FAIL	cidb
	test_database_iceberg_lakekeeper_catalog/test.py::test_tables_with_same_location	FAIL	cidb
Integration tests (amd_binary, 3/5)		failure
	test_database_iceberg_lakekeeper_catalog/test.py::test_select	FAIL	cidb
	test_database_iceberg_lakekeeper_catalog/test.py::test_tables_with_same_location	FAIL	cidb
Integration tests (amd_binary, 4/5)		failure
	test_database_iceberg_nessie_catalog/test.py::test_select	FAIL	cidb
	test_database_iceberg_nessie_catalog/test.py::test_tables_with_same_location	FAIL	cidb
	test_database_iceberg_nessie_catalog/test.py::test_timestamps	FAIL	cidb
	test_database_iceberg_nessie_catalog/test.py::test_insert	FAIL	cidb
Integration tests (arm_binary, distributed plan, 1/4)		failure
	test_database_iceberg_nessie_catalog/test.py::test_select	FAIL	cidb
	test_database_iceberg_nessie_catalog/test.py::test_tables_with_same_location	FAIL	cidb
	test_database_iceberg_nessie_catalog/test.py::test_timestamps	FAIL	cidb
	test_database_iceberg_nessie_catalog/test.py::test_insert	FAIL	cidb
Integration tests (arm_binary, distributed plan, 4/4)		failure
	test_database_iceberg_lakekeeper_catalog/test.py::test_select	FAIL	cidb
	test_database_iceberg_lakekeeper_catalog/test.py::test_tables_with_same_location	FAIL	cidb
Integration tests (amd_tsan, 1/6)		failure
	test_database_iceberg_nessie_catalog/test.py::test_select	FAIL	cidb
	test_database_iceberg_nessie_catalog/test.py::test_tables_with_same_location	FAIL	cidb
	test_database_iceberg_nessie_catalog/test.py::test_timestamps	FAIL	cidb
	test_database_iceberg_nessie_catalog/test.py::test_insert	FAIL	cidb
Integration tests (amd_tsan, 6/6)		failure
	test_database_iceberg_lakekeeper_catalog/test.py::test_select	FAIL	cidb
	test_database_iceberg_lakekeeper_catalog/test.py::test_tables_with_same_location	FAIL	cidb
Integration tests (amd_msan, 1/6)		failure
	test_database_iceberg_nessie_catalog/test.py::test_select	FAIL	cidb
	test_database_iceberg_nessie_catalog/test.py::test_tables_with_same_location	FAIL	cidb
	test_database_iceberg_nessie_catalog/test.py::test_timestamps	FAIL	cidb
	test_database_iceberg_nessie_catalog/test.py::test_insert	FAIL	cidb

---

AI Review

Summary

This PR fixes a real correctness issue in SerializationMapKeyValue::deserializeBinaryBulkWithMultipleStreams for Map subcolumn reads by always enabling insert_only_rows_in_current_range_from_substreams_cache in the temporary nested-column path, and adds a focused stateless regression test (04076_map_key_value_subcolumn_cache_bug.sql) that reproduces the multi-range read scenario. I did not find blocker- or major-level correctness, safety, concurrency, performance, or compliance issues in the proposed change.

ClickHouse Rules

Item	Status	Notes
Deletion logging	➖
Serialization versioning	➖
Core-area scrutiny	✅
No test removal	✅
Experimental gate	➖
No magic constants	✅
Backward compatibility	✅
SettingsChangesHistory.cpp	➖
PR metadata quality	✅
Safe rollout	✅
Compilation time	✅
No large/binary files	✅

Final Verdict

• Status: ✅ Approve

[alexey-milovidov]

The Stress test (arm_msan) failure is fixed by #101239, which should be merged first. After it is merged, please update the branch to include the fix.

[clickhouse-gh]

LLVM Coverage Report

Metric	Baseline	Current	Δ
Lines	84.00%	84.00%	+0.00%
Functions	90.90%	90.90%	+0.00%
Branches	76.50%	76.50%	+0.00%

Changed lines: 100.00% (7/7) · Uncovered code

Full report · Diff report

[alexey-milovidov]

The failures look related.

Upd: they aren't.

[alexey-milovidov]

Except Iceberg failures - they are likely due to Docker.

[alexey-milovidov]

Checked the test 04092_tcp_settings_parse_error_closes_connection it was reverted in master.

[alexey-milovidov]

The test_database_iceberg_nessie_catalog and test_database_iceberg_lakekeeper_catalog failures in this PR's CI are false positives caused by a bug in PR #100583 (merged to master on 2026-04-09 at 11:19 UTC). That PR broke the metadata file path resolution in getMetadataLocation for Iceberg catalog tests — it produced a doubled S3 key like table_path/warehouse-rest/table_path/metadata/... instead of table_path/metadata/..., causing MinIO to return 403.

The bug was reverted by PR #102247 (merged at ~14:48 UTC). All nessie/lakekeeper test failures between these two merges are unrelated to this PR.