Update drill_4872.sql

[agirish]

Sometimes if the tests are aborted, or in similar situations, there may be existing data and CTAS fails:

Fragment 1:1

Please, refer to logs for more information.

[Error Id: 429c404d-5cb3-4212-820c-21c9ba290d2a on drillcluster1-drillbit-1.drillcluster1-svc.maprtenant1.svc.cluster.local:31010]

  (java.io.IOException) File [/tmp/t_drill4872/1_1_1.parquet] already exists on file system [maprfs:///apps/drill].
    org.apache.drill.exec.store.StorageStrategy.createFileAndApply():136
    org.apache.drill.exec.store.parquet.ParquetRecordWriter.endRecord():441
    org.apache.drill.exec.store.EventBasedRecordWriter.write():51

[kkhatua]

+1