Github user HyukjinKwon commented on a diff in the pull request: https://github.com/apache/spark/pull/19448#discussion_r143879132 --- Diff: sql/core/src/main/scala/org/apache/spark/sql/execution/datasources/parquet/ParquetFileFormat.scala --- @@ -138,6 +138,13 @@ class ParquetFileFormat conf.setBoolean(ParquetOutputFormat.ENABLE_JOB_SUMMARY, false) } + if (conf.getBoolean(ParquetOutputFormat.ENABLE_JOB_SUMMARY, false) + && !classOf[ParquetOutputCommitter].isAssignableFrom(committerClass)) { + // output summary is requested, but the class is not a Parquet Committer + throw new RuntimeException(s"Committer $committerClass is not a ParquetOutputCommitter" + + s" and cannot create job summaries.") --- End diff -- Looks we can remove this `s` BTW.
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