Summary of Changes

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This pull request enhances the reliability of a critical Spanner change stream integration test. By modifying how the test asserts the correctness of change records, it eliminates flakiness caused by variations in data flushing, ensuring consistent and accurate validation of the Spanner connector's behavior.

Highlights

• Test Stability Improvement: The SpannerChangeStreamOrderedByTimestampAndTransactionIdIT integration test was updated to prevent flakiness. Assertions now operate on individual change records, decoupling the test from the non-deterministic flushing behavior of change stream tokens.

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R: @kennknowles for label java.

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Nice, the per-line split correctly removes the dependency on non-deterministic flush boundaries, and should indeed fix the flakes.

One question: the original assertion also implicitly verified intra-transaction ordering (e.g., that the DELETE for SingerId 1 always followed the INSERT for SingerId 1+2 within the same commit). With containsInAnyOrder on individual lines, that ordering property is no longer asserted.

Is that intentional, or would it be worth adding a lightweight ordering check per commit timestamp / transaction ID on top of this?

@bvolpato Great point and you’re absolutely right. that relaxation is intentional for this test as the flake came from timer flush grouping, so I changed the assertion to validate stable semantics only (presence/count of records) and removed dependence on grouping order across flushes

also this is right that this drops an implicit ordering signal. I dont want to lose that coverage entirely, so I can add a small follow up assertion that checks ordering using the existing sort key (commitTimestamp, transactionId) in a deterministic way, without relying on flush chunk boundaries