Add intial IT for XTable REST Service

[rahil-c]

What is the purpose of the pull request

This pr aims to add integration tests which test the XTable REST Service for combinations of all table formats, for both partitioned and unpartitioned tables.

Special Note

• Before we land this pr we will need to land the following pr: Add additional properties when doing conversion for hudi #714 which has some bug fixes for the service.

Brief change log

Adds an IT Test for conversion service.

Verify this pull request

Ran the IT test locally which passes (see screenshot)

[rahil-c]

Unsure why the IT itself is flaky on the CI as it passes fine locally.

[vinishjail97]

@rahil-c Can you rebase with the latest main? I can merge after that.

[vinishjail97]

Error: ITConversionService.testVariousOperations(String, boolean)[1] » Spark Job aborted due to stage failure: Task 0 in stage 36.0 failed 1 times, most recent failure: Lost task 0.0 in stage 36.0 (TID 104) (fv-az1983-640.xojnruca2udebm2tjfdy52k3le.bx.internal.cloudapp.net executor driver): scala.MatchError: TimestampNTZType (of class org.apache.spark.sql.types.TimestampNTZType$)

Is this passing locally?

[rahil-c]

Put a fix again, ran the test locally passing, hoping CI passes.

[rahil-c]

CI did not fail for an error but it seemed like it was canceled?

I also ran from my local terminal instead of intellij mvn clean test -Dtest=ITConversionService and seems test pass fine, so wondering if we can retrigger the run for this?

INFO]  T E S T S
[INFO] -------------------------------------------------------
[INFO] Running org.apache.xtable.service.ITConversionService
WARNING: An illegal reflective access operation has occurred
WARNING: Illegal reflective access by org.apache.spark.unsafe.Platform (file:/Users/rahil/.m2/repository/org/apache/spark/spark-unsafe_2.12/3.4.2/spark-unsafe_2.12-3.4.2.jar) to constructor java.nio.DirectByteBuffer(long,int)
WARNING: Please consider reporting this to the maintainers of org.apache.spark.unsafe.Platform
WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations
WARNING: All illegal access operations will be denied in a future release
[INFO] Tests run: 6, Failures: 0, Errors: 0, Skipped: 0, Time elapsed: 102.1 s -- in org.apache.xtable.service.ITConversionService
[INFO]
[INFO] Results:
[INFO]
[INFO] Tests run: 6, Failures: 0, Errors: 0, Skipped: 0
[INFO]
[INFO]
[INFO] --- surefire:3.3.0:test (default) @ xtable-service ---
[INFO] Skipping execution of surefire because it has already been run for this configuration
[INFO] Saved Build to local file: /Users/rahil/.m2/build-cache/v1/org.apache.xtable/xtable-service/d9e9c1b952afb9bc/local/buildinfo.xml
[INFO] ------------------------------------------------------------------------
[INFO] BUILD SUCCESS
[INFO] ------------------------------------------------------------------------
[INFO] Total time:  01:51 min
[INFO] Finished at: 2025-06-24T17:37:15-07:00
[INFO] ------------------------------------------------------------------------
 rahil@mac  ~/workplace/incubator-xtable/xtable-service   integ-tests 

[rahil-c]

@vinishjail97 can you merge this when you get a chance ci passes.