[BP-2.3][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 11 of the 16 release-2.3
  nightlies between 2026-09-10 and 2026-09-17 (8 on Azure, 8 on GitHub Actions) and the push run
  of e10aab797f (https://github.com/apache/flink/actions/runs/35220462243)

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-2.2; 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: 21 of 103 runs failed on cf7fbd3317d, 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

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Generated-by: Claude Code (Claude Opus 5)

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CI report:

• 5b34d89 Azure: SUCCESS

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