Support MariaDB VECTOR during CDC

[ilidemi]

Maria binlog encodes vectors as MYSQL_TYPE_VARCHAR and gives us string while MySQL comes as []byte

Resolves DBI-826

[github-actions]

🔄 Flaky Test Detected

Analysis: The MongoDB container setup hit a "not primary" race condition where db.createUser ran before the replica set finished electing a primary after rs.initiate(), an environmental flake unrelated to the MySQL-focused branch.
Confidence: 0.95

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[claude]

Code review

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

[github-actions]

🔄 Flaky Test Detected

Analysis: The flow/e2e package hit its 20-minute package timeout with no single hung test (longest-running was only ~2m) and no deadlock in the dump, with the still-running tests being unrelated PostgreSQL e2e cases rather than the PR's MariaDB VECTOR change — indicating the known-flaky, high-concurrency suite simply overran its wall-clock budget.
Confidence: 0.82

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[pfcoperez]

LGTM, I'd change the PR title (which is preserved in the commit history) because the type is not only supported in MariaDB VECTOR but also in MySQL 9.0+, according to the tests conditions themselves, and they use the same format.

Correction on my comment: I see we treat a different underlying type for MySQL.

[codecov]

❌ 1 Tests Failed:

Tests completed	Failed	Passed	Skipped
2332	1	2331	220

View the top 1 failed test(s) by shortest run time

github.com/PeerDB-io/peerdb/flow/connectors/postgres::TestRunPipeline_FilterStripsLines

Stack Traces | 0s run time

=== RUN   TestRunPipeline_FilterStripsLines
    pgdump_schema_test.go:262: unexpected error: src failed: signal: killed
        stderr:
--- FAIL: TestRunPipeline_FilterStripsLines (0.00s)

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[github-actions]

🔄 Flaky Test Detected

Analysis: The fully self-contained test TestRunPipeline_FilterStripsLines failed with "src failed: signal: killed" because its trivial local printf subprocess was SIGKILLed externally (OOM/resource exhaustion on the heavily-parallel runner), not due to any logic bug—and it failed in only 1 of 5 matrix jobs on an unrelated MySQL PR.
Confidence: 0.88

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