[BP-2.2][FLINK-40683][table] Assert materialized data in the anti-join-on-nested semantic test

[MartijnVisser]

What is the purpose of the change

• JoinSemanticTests[anti-join-on-nested] asserts the raw changelog, so it fails whenever the
  anti join transiently emits and retracts +I[test_same]. It failed 6 of the 8 release-2.2
  Azure nightlies between 2026-09-10 and 2026-09-17, last in test_cron_jdk21 table of
  https://dev.azure.com/apache-flink/apache-flink/_build/results?buildId=79135

Brief change log

• The anti-join-on-nested sink asserts the materialized result instead of the raw changelog,
  like the other program in the file
• Not a cherry-pick: master got the line from FLINK-39695 (4f8b4a88b1e), which also copies
  Calcite classes into the planner and does not belong on a patch branch
• The companion PR makes the same change on release-2.3; release-1.20 does not have this test

Verifying this change

This change is already covered by existing tests, such as JoinSemanticTests.

• each variant compiled once with ./mvnw -o -pl flink-table/flink-table-planner test -Dtest=JoinSemanticTests, then looped with surefire:test, JDK 17, under CPU
  load: 11 of 102 runs failed on aed108ff0dd, 0 of 100 with this commit applied
• changing NOT EXISTS to EXISTS makes the patched test fail, so the assertion still catches a
  regression

Does this pull request potentially affect one of the following parts:

• Dependencies (does it add or upgrade a dependency): no
• The public API, i.e., is any changed class annotated with @Public(Evolving): no
• The serializers: no
• The runtime per-record code paths (performance sensitive): no
• Anything that affects deployment or recovery: JobManager (and its components), Checkpointing, Kubernetes/Yarn, ZooKeeper: no
• The S3 file system connector: no

Documentation

• Does this pull request introduce a new feature? no
• If yes, how is the feature documented? not applicable

---

Was generative AI tooling used to co-author this PR?

• Yes (please specify the tool below)

Generated-by: Claude Code (Claude Opus 5)

[flinkbot]

CI report:

• 7cbd1f6 Azure: SUCCESS

Bot commands

The @flinkbot bot supports the following commands:

• @flinkbot run azure re-run the last Azure build