Thanks for working on this. I reviewed the latest head from scratch and traced the generated insert SQL path, the validation guards, and the insert-only runtime boundary.

What this PR solves

• User pain: Oracle users may want to use INSERT /*+ APPEND_VALUES */ for append-only bulk writes, but SeaTunnel currently only emits the conventional insert form.
• Fix approach: add an explicit oracle_insert_mode option, inject the APPEND_VALUES hint only on the generated insert SQL path, and fail fast for unsupported combinations.
• One-line summary: the latest head keeps the feature boundary tight, and I did not find a new blocker on the Oracle append-values path.

Runtime path I checked

sink construction
  -> JdbcOutputFormatBuilder.build() [60-109]
      -> validateOracleInsertMode(...)
      -> choose generated insert-only path only when the config is compatible

generated insert SQL path
  -> createSimpleBufferedExecutor(...) [112-124]
      -> dialect.getInsertIntoStatement(...)
      -> applyOracleAppendValuesHintIfNeeded(...) [358-...]

guard rails
  -> reject non-Oracle dialect
  -> reject custom query
  -> reject exactly-once
  -> reject auto_commit=false
  -> reject primary-key / upsert-style modes

Review result

• JdbcOutputFormatBuilder.java:63-90 validates the mode before any executor selection, which is the right place to keep the feature boundary explicit.
• The hint injection is limited to the generated insert SQL path, so it does not silently mutate custom SQL.
• The tests in JdbcOutputFormatBuilderTest.java:137-248 cover the important allowed/forbidden combinations.
• I did not find a new source-level blocker on the latest head.

Tests / CI

• The new unit coverage is targeted and stable.
• I did not see a flaky-test pattern in the added tests.
• The current GitHub Build is still in progress, but I do not have a source-level blocker to add on top of the latest code.

Conclusion: can merge

1. Blocking items

• None from my side on the latest head.

2. Suggested non-blocking follow-up

• None from my side on this code path.

From the code-review side this looks good.

Thanks for the update. I re-reviewed the latest head from scratch, including the new head commit, and traced the Oracle insert-only sink path again.

What this PR solves

• User pain: Oracle users may want INSERT /*+ APPEND_VALUES */ for append-only bulk writes, but SeaTunnel currently emits only the conventional insert form.
• Fix approach: add oracle_insert_mode, keep the hint injection on the generated insert-only SQL path, and fail fast for unsupported combinations.
• One-line summary: the latest head keeps the feature boundary tight, and the follow-up JdbcHiveIT fix does not reopen the Oracle sink path.

Runtime chain I checked

sink construction
  -> JdbcSinkFactory.createSink(...)
  -> JdbcOutputFormatBuilder.build()
      -> validateOracleInsertMode(...)
      -> createSimpleBufferedExecutor(...)
          -> dialect.getInsertIntoStatement(...)
          -> applyOracleAppendValuesHintIfNeeded(...)

Re-review result

• The Oracle logic is still correctly guarded in JdbcOutputFormatBuilder.java:63-168,355-413.
• The latest head commit only updates JdbcHiveIT for the catalog-utils signature and does not change the Oracle runtime path.
• The UT / E2E additions remain aligned with the intended insert-only boundary.

Tests / stability

• The added UTs are stable: no fixed sleeps, no hard-coded shared ports, and the assertions target deterministic guard-rail behavior.
• The Oracle IT still covers the generated insert path.
• I do not have a new source-level blocker on the latest head.

Conclusion: can merge

1. Blocking items

• None from my side on the latest head.

2. Suggested non-blocking follow-up

• None.

From the code-review side this looks good to merge.

LGTM