fix: Add tests for non-pk table cdc works in append-only mode with Merge Tree

[masterashu]

• fix: Add tests for non-pk table cdc works in append-only mode with Merge Tree
• Add validation to prevent null sharding key when setting up no-Primary Key table

[codecov]

❌ 4 Tests Failed:

Tests completed	Failed	Passed	Skipped
2657	4	2653	352

View the top 3 failed test(s) by shortest run time

github.com/PeerDB-io/peerdb/flow/e2e::TestPeerFlowE2ETestSuiteMariaDB_CH_Cluster

Stack Traces | 0.01s run time

=== RUN   TestPeerFlowE2ETestSuiteMariaDB_CH_Cluster
=== PAUSE TestPeerFlowE2ETestSuiteMariaDB_CH_Cluster
=== CONT  TestPeerFlowE2ETestSuiteMariaDB_CH_Cluster
--- FAIL: TestPeerFlowE2ETestSuiteMariaDB_CH_Cluster (0.01s)

github.com/PeerDB-io/peerdb/flow/e2e::TestPeerFlowE2ETestSuiteMySQL_CH_Cluster

Stack Traces | 0.01s run time

=== RUN   TestPeerFlowE2ETestSuiteMySQL_CH_Cluster
=== PAUSE TestPeerFlowE2ETestSuiteMySQL_CH_Cluster
=== CONT  TestPeerFlowE2ETestSuiteMySQL_CH_Cluster
--- FAIL: TestPeerFlowE2ETestSuiteMySQL_CH_Cluster (0.01s)
2026/06/30 12:49:52 INFO Received AWS credentials from peer for connector: ci x-peerdb-additional-metadata={Operation:FLOW_OPERATION_UNKNOWN}
2026/06/30 12:49:52 INFO Received AWS credentials from peer for connector: clickhouse x-peerdb-additional-metadata={Operation:FLOW_OPERATION_UNKNOWN}
2026/06/30 12:49:52 INFO fetched schema x-peerdb-additional-metadata={Operation:FLOW_OPERATION_UNKNOWN} table=e2e_test_mach_2arn0p9u.test_mysql_schema_changes

github.com/PeerDB-io/peerdb/flow/e2e::TestPeerFlowE2ETestSuiteMariaDB_CH_Cluster/Test_MySQL_NoPrimaryKey_CDC

Stack Traces | 61.2s run time

=== RUN   TestPeerFlowE2ETestSuiteMariaDB_CH_Cluster/Test_MySQL_NoPrimaryKey_CDC
=== PAUSE TestPeerFlowE2ETestSuiteMariaDB_CH_Cluster/Test_MySQL_NoPrimaryKey_CDC
=== CONT  TestPeerFlowE2ETestSuiteMariaDB_CH_Cluster/Test_MySQL_NoPrimaryKey_CDC
2026/06/30 12:56:31 INFO Received AWS credentials from peer for connector: ci x-peerdb-additional-metadata={Operation:FLOW_OPERATION_UNKNOWN}
2026/06/30 12:56:31 INFO fetched schema x-peerdb-additional-metadata={Operation:FLOW_OPERATION_UNKNOWN} table=e2e_test_machcl_0dp0jr6n.test_nullable_sc_ch
    clickhouse_mysql_test.go:2063: UNEXPECTED STATUS TIMEOUT STATUS_SNAPSHOT
--- FAIL: TestPeerFlowE2ETestSuiteMariaDB_CH_Cluster/Test_MySQL_NoPrimaryKey_CDC (61.18s)

github.com/PeerDB-io/peerdb/flow/e2e::TestPeerFlowE2ETestSuiteMySQL_CH_Cluster/Test_MySQL_NoPrimaryKey_CDC

Stack Traces | 61.2s run time

=== RUN   TestPeerFlowE2ETestSuiteMySQL_CH_Cluster/Test_MySQL_NoPrimaryKey_CDC
=== PAUSE TestPeerFlowE2ETestSuiteMySQL_CH_Cluster/Test_MySQL_NoPrimaryKey_CDC
=== CONT  TestPeerFlowE2ETestSuiteMySQL_CH_Cluster/Test_MySQL_NoPrimaryKey_CDC
2026/06/30 12:48:51 INFO Received AWS credentials from peer for connector: ci x-peerdb-additional-metadata={Operation:FLOW_OPERATION_UNKNOWN}
2026/06/30 12:48:51 INFO Received AWS credentials from peer for connector: clickhouse x-peerdb-additional-metadata={Operation:FLOW_OPERATION_UNKNOWN}
2026/06/30 12:48:51 INFO fetched schema x-peerdb-additional-metadata={Operation:FLOW_OPERATION_UNKNOWN} table=e2e_test_mychcl_cdx6xlgk.test_unsigned
    clickhouse_mysql_test.go:2063: UNEXPECTED STATUS TIMEOUT STATUS_SNAPSHOT
--- FAIL: TestPeerFlowE2ETestSuiteMySQL_CH_Cluster/Test_MySQL_NoPrimaryKey_CDC (61.18s)

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[github-actions]

❌ Test Failure

Analysis: The newly-added Test_MySQL_NoPrimaryKey_CDC fails deterministically across every matrix job (MySQL/MariaDB, 6.0/8.0) with "UNEXPECTED STATUS TIMEOUT STATUS_SNAPSHOT", meaning the non-PK CDC mirror introduced by this PR never advances past the snapshot phase — a real bug, not flakiness.
Confidence: 0.92

⚠️ This appears to be a real bug - manual intervention needed

View workflow run

[claude]

Code review

No issues found. Checked for bugs and CLAUDE.md compliance.

[ilidemi]

Does this fail on cluster or just because of the local testing? We usually test the cluster behavior in CI

[masterashu]

This failed for the cluster on GitHub CI too, so now with clickhouse cluster working locally, will test it out.