Github user maropu commented on a diff in the pull request: https://github.com/apache/spark/pull/10502#discussion_r48593431 --- Diff: sql/core/src/main/scala/org/apache/spark/sql/execution/datasources/parquet/ParquetRelation.scala --- @@ -288,20 +293,28 @@ private[sql] class ParquetRelation( } } + override def unhandledFilters(filters: Array[Filter]): Array[Filter] = { + // The unsafe row RecordReader does not support row by row filtering so for this case + // it should wrap this with Spark-side filtering. + val enableUnsafeRowParquetReader = + sqlContext.getConf(SQLConf.PARQUET_UNSAFE_ROW_RECORD_READER_ENABLED.key).toBoolean --- End diff -- Since `SQLConf.PARQUET_UNSAFE_ROW_RECORD_READER_ENABLED` is internally true by default, this `unhandledFilters` always returns `filters` as it is. So, this optimization is little meaningful to end users. IMO if `UnsafeRowParquetRecordReader` supports row-by-row filtering, then we implement this. Though?
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