[SPARK-27194][SPARK-29302][SQL] Define a spark staging committer to resolve FileAlreadyExistingException#28989

turboFei wants to merge 4 commits intoapache:masterapache/spark:masterfrom

turboFei:SPARK-27194-custom-committerturboFei/spark:SPARK-27194-custom-committerCopy head branch name to clipboard