Fix merging JSON columns in Summing/Aggregating/Coalescing MergeTree

[Avogar]

Changelog category (leave one):

• Critical Bug Fix (crash, data loss, RBAC) or LOGICAL_ERROR

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

Fix merging JSON columns in Summing/Aggregating/Coalescing MergeTree. Previously it could lead to unexpected dynamic paths durign writing to data parts.

Documentation entry for user-facing changes

• Documentation is written (mandatory for new features)

[clickhouse-gh]

Workflow [PR], commit [d591396]

Summary: ❌

job_name	test_name	status	info	comment
Integration tests (amd_asan, db disk, old analyzer, 2/6)		failure
	test_database_hms/test.py::test_hive_catalog_url_parsing	FAIL	cidb
	test_disabled_mysql_server/test.py::test_disabled_mysql_server	FAIL	cidb
Integration tests (amd_asan, db disk, old analyzer, 5/6)		failure
	test_storage_iceberg_no_spark/test_writes_statistics_by_minmax_pruning.py::test_writes_statistics_by_minmax_pruning[s3-1]	FAIL	cidb
	test_storage_iceberg_no_spark/test_writes_statistics_by_minmax_pruning.py::test_writes_statistics_by_minmax_pruning[s3-2]	FAIL	cidb
	test_storage_iceberg_no_spark/test_writes_statistics_by_minmax_pruning.py::test_writes_statistics_by_minmax_pruning[azure-1]	FAIL	cidb
	test_storage_iceberg_no_spark/test_writes_statistics_by_minmax_pruning.py::test_writes_statistics_by_minmax_pruning[azure-2]	FAIL	cidb
	test_storage_iceberg_no_spark/test_writes_statistics_by_minmax_pruning.py::test_writes_statistics_by_minmax_pruning[local-1]	FAIL	cidb
	test_storage_iceberg_no_spark/test_writes_statistics_by_minmax_pruning.py::test_writes_statistics_by_minmax_pruning[local-2]	FAIL	cidb
Integration tests (amd_binary, 5/5)		failure
	test_database_delta/test.py::test_embedded_database_and_tables[1]	FAIL	cidb
	test_database_delta/test.py::test_embedded_database_and_tables[0]	FAIL	cidb
	test_database_delta/test.py::test_multiple_schemes_tables	FAIL	cidb
	test_database_delta/test.py::test_complex_table_schema[1]	FAIL	cidb
	test_database_delta/test.py::test_complex_table_schema[0]	FAIL	cidb
	test_database_delta/test.py::test_timestamp_ntz[1]	FAIL	cidb
	test_database_delta/test.py::test_timestamp_ntz[0]	FAIL	cidb
	test_database_delta/test.py::test_no_permission_and_list_tables	FAIL	cidb
	test_database_delta/test.py::test_view_with_void[1]	FAIL	cidb
	test_database_delta/test.py::test_view_with_void[0]	FAIL	cidb
Integration tests (amd_tsan, 2/6)		failure
	test_database_hms/test.py::test_hive_catalog_url_parsing	FAIL	cidb
	test_backup_restore_on_cluster/test_different_versions.py::test_different_versions	FAIL	cidb
	test_disabled_mysql_server/test.py::test_disabled_mysql_server	FAIL	cidb
Integration tests (amd_tsan, 5/6)		failure
	test_database_delta/test.py::test_embedded_database_and_tables[1]	FAIL	cidb
	test_database_delta/test.py::test_embedded_database_and_tables[0]	FAIL	cidb
	test_database_delta/test.py::test_multiple_schemes_tables	FAIL	cidb
	test_database_delta/test.py::test_complex_table_schema[1]	FAIL	cidb
	test_database_delta/test.py::test_complex_table_schema[0]	FAIL	cidb
	test_database_delta/test.py::test_timestamp_ntz[1]	FAIL	cidb
	test_database_delta/test.py::test_timestamp_ntz[0]	FAIL	cidb
	test_database_delta/test.py::test_no_permission_and_list_tables	FAIL	cidb
	test_database_delta/test.py::test_view_with_void[1]	FAIL	cidb
	test_database_delta/test.py::test_view_with_void[0]	FAIL	cidb
BuzzHouse (amd_debug)		failure
	Logical error: 'Inconsistent AST formatting: the query:	FAIL	cidb
BuzzHouse (amd_msan)		failure
	Unknown error	FAIL	cidb

[novikd]

LGTM

[Avogar]

Integration tests are broken and failes with timeouts right now