Fix the compilation warning related to other-pure-statement

"-Wconf:cat=other-match-analysis&site=org.apache.spark.sql.catalyst.catalog.SessionCatalog.lookupFunction.catalogFunction:wv",
"-Wconf:cat=other-pure-statement&site=org.apache.spark.streaming.util.FileBasedWriteAheadLog.readAll.readFile:wv",
"-Wconf:cat=other-pure-statement&site=org.apache.spark.scheduler.OutputCommitCoordinatorSuite:wv",
"-Wconf:cat=other-pure-statement&site=org.apache.spark.sql.streaming.sources.StreamingDataSourceV2Suite.testPositiveCase.\\$anonfun:wv",