Github user cloud-fan commented on a diff in the pull request: https://github.com/apache/spark/pull/21623#discussion_r199080962 --- Diff: sql/core/src/test/scala/org/apache/spark/sql/execution/datasources/parquet/ParquetFilterSuite.scala --- @@ -140,6 +142,32 @@ class ParquetFilterSuite extends QueryTest with ParquetTest with SharedSQLContex checkBinaryFilterPredicate(predicate, filterClass, Seq(Row(expected)))(df) } + // This function tests that exactly go through the `canDrop` and `inverseCanDrop`. + private def testStringStartsWith(dataFrame: DataFrame, filter: String): Unit = { + withTempPath { dir => + val path = dir.getCanonicalPath + dataFrame.write.option("parquet.block.size", 512).parquet(path) + Seq(true, false).foreach { pushDown => + withSQLConf( + SQLConf.PARQUET_FILTER_PUSHDOWN_STRING_STARTSWITH_ENABLED.key -> pushDown.toString) { + val accu = new NumRowGroupsAcc + sparkContext.register(accu) + + val df = spark.read.parquet(path).filter(filter) + df.foreachPartition((it: Iterator[Row]) => it.foreach(v => accu.add(0))) + df.collect --- End diff -- what does this `collect` do? `foreachPartition` is already an action
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