[VL] minor change for delta ut

[zhli1142015]

What changes were proposed in this pull request?

Avoid some annoying errors in local runs.

- column mapping mode = name *** FAILED ***
  org.apache.spark.sql.delta.DeltaAnalysisException: Cannot create table ('`default`.`delta_cm2`'). The associated location ('file:/var/gluten/gluten-delta/spark-warehouse/io.glutenproject.execution.VeloxDeltaSuite/delta_cm2') is not empty and also not a Delta table.

How was this patch tested?

(Please explain how this patch was tested. E.g. unit tests, integration tests, manual tests)

(If this patch involves UI changes, please attach a screenshot; otherwise, remove this)

[github-actions]

Thanks for opening a pull request!

Could you open an issue for this pull request on Github Issues?

https://github.com/oap-project/gluten/issues

Then could you also rename commit message and pull request title in the following format?

[GLUTEN-${ISSUES_ID}][COMPONENT]feat/fix: ${detailed message}

See also:

• Other pull requests