[Bug] Two FE UT failures on current master

[bosswnx]

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Version

master: 5fbe3600024 (Sep 1); failure 1 also reproduced on d454100765c (Aug 31 master)

What's Wrong?

Two FE unit tests fail on current master itself. Both are test-vs-code contradictions introduced by upstream PRs landing in a conflicting order.

Found while running the full local FE unit test suite to validate #67310; unrelated to that PR (it only touches MasterOpExecutor / FrontendServiceImpl / thrift definitions, zero overlap with these modules).

1. IcebergWritePlanProviderTest.planMergePreservesExplicitlyEmptyReadAcrossConcurrentFirstAppend

org.opentest4j.AssertionFailedError: an explicitly empty read must leave RowDelta validation unbounded across the first append ==> expected: <null> but was: <-1>
    at org.apache.doris.connector.iceberg.IcebergWritePlanProviderTest
        .planMergePreservesExplicitlyEmptyReadAcrossConcurrentFirstAppend(IcebergWritePlanProviderTest.java:1727)

• The test was added by [fix](iceberg) Fix MVCC and nested schema evolution edge cases #66345 (Aug 6) asserting baseSnapshotId == null for an explicitly pinned empty read.
• [fix](iceberg) Harden external-write lifecycle, OCC, memory, and file ownership #66348 (Aug 14) deliberately changed the semantics: an explicitly pinned -1 is kept as an OCC fence (IcebergConnectorTransaction.applyBeginGuards, comment "An explicitly pinned -1 is the empty-table generation and must remain an OCC fence"), and the null-arm was replaced by Long.valueOf(pinnedReadSnapshot).
• The old assertion was not updated, so this test has been failing on master since Aug 14.

2. PropertyAnalyzerTest.testAnalyzePartitionInvertedIndexFileStorageFormat

org.opentest4j.AssertionFailedError: expected: <true> but was: <false>
    at org.apache.doris.common.PropertyAnalyzerTest
        .testAnalyzePartitionInvertedIndexFileStorageFormat(PropertyAnalyzerTest.java:412)

• The test was added by [feat](cloud) Support Cloud partition inverted format rollout #66475 (Sep 1) and expects partition.inverted_index_storage_format = "V1" to be rejected with the partition-level message "only supports V2, V3 and SNII".
• But [fix](fe) block inverted index V1 creation in FE  #64522 (Aug 24) already made analyzeInvertedIndexFileStorageFormat throw "Inverted index V1 is deprecated and no longer allowed for new index creation" for any v1 input — which fires before the partition-level V1 check, making that check (and the expected message) unreachable dead code.

What You Expected?

Both tests should pass on master.

How to Reproduce?

1. cd fe && mvn test -pl fe-connector/fe-connector-iceberg -am -Dtest=IcebergWritePlanProviderTest
2. cd fe && mvn test -pl fe-core -am -Dtest=PropertyAnalyzerTest

Suggested fixes:

• Failure 1: update the assertion to assertEquals(Long.valueOf(-1L), txn.getBaseSnapshotId()) (matching the intent documented in [fix](iceberg) Harden external-write lifecycle, OCC, memory, and file ownership #66348).
• Failure 2: either accept either rejection message in the assertion, or have analyzePartitionInvertedIndexFileStorageFormat surface its own message for V1 before delegating to analyzeInvertedIndexFileStorageFormat.

Anything Else?

• JDK 17, Maven 3.9.16, single-fork surefire
• Failing test files verified identical to master (zero diff)

Are you willing to submit PR?

• Yes I am willing to submit a PR!