Franck Tago created SPARK-44768: ----------------------------------- Summary: Improve WSCG handling of row buffer by accounting for executor memory Key: SPARK-44768 URL: https://issues.apache.org/jira/browse/SPARK-44768 Project: Spark Issue Type: Bug Components: Optimizer Affects Versions: 3.4.1, 3.4.0, 3.3.2 Reporter: Franck Tago
consider a scenario where you flatten a nested array // e.g you can use the following steps to create the dataframe /create a partClass case class partClass (PARTNAME: String , PartNumber: String , PartPrice : Double ) //create a nested array array class case class array_array_class ( col_int: Int, arr_arr_string : Seq[Seq[String]], arr_arr_bigint : Seq[Seq[Long]], col_string : String, parts_s : Seq[Seq[partClass]] ) //create a dataframe var df_array_array = sc.parallelize( Seq( (1,Seq(Seq("a","b" ,"c" ,"d") ,Seq("aa","bb" ,"cc","dd")) , Seq(Seq(1000,20000), Seq(30000,-10000)),"ItemPart1", Seq(Seq(partClass("PNAME1","P1",20.75),partClass("PNAME1_1","P1_1",30.75))) ) , (2,Seq(Seq("ab","bc" ,"cd" ,"de") ,Seq("aab","bbc" ,"ccd","dde"),Seq("aaaaaabbbbb")) , Seq(Seq(-1000,-20000,-1,-2), Seq(0,30000,-10000)),"ItemPart2", Seq(Seq(partClass("PNAME2","P2",170.75),partClass("PNAME2_1","P2_1",33.75),partClass("PNAME2_2","P2_2",73.75))) ) ) ).toDF("c1" ,"c2" ,"c3" ,"c4" ,"c5") //explode a nested array var result = df_array_array.select( col("c1"), explode(col("c2"))).select('c1 , explode('col)) result.explain The physical for this operator is seen below. ------------------------------------- Physical plan == Physical Plan == *(1) Generate explode(col#27), [c1#17], false, [col#30] +- *(1) Filter ((size(col#27, true) > 0) AND isnotnull(col#27)) +- *(1) Generate explode(c2#18), [c1#17], false, [col#27] +- *(1) Project [_1#6 AS c1#17, _2#7 AS c2#18] +- *(1) Filter ((size(_2#7, true) > 0) AND isnotnull(_2#7)) +- *(1) SerializeFromObject [knownnotnull(assertnotnull(input[0, scala.Tuple5, true]))._1 AS _1#6, mapobjects(lambdavariable(MapObject, ObjectType(class java.lang.Object), true, -1), mapobjects(lambdavariable(MapObject, ObjectType(class java.lang.Object), true, -2), staticinvoke(class org.apache.spark.unsafe.types.UTF8String, StringType, fromString, validateexternaltype(lambdavariable(MapObject, ObjectType(class java.lang.Object), true, -2), StringType, ObjectType(class java.lang.String)), true, false, true), validateexternaltype(lambdavariable(MapObject, ObjectType(class java.lang.Object), true, -1), ArrayType(StringType,true), ObjectType(interface scala.collection.Seq)), None), knownnotnull(assertnotnull(input[0, scala.Tuple5, true]))._2, None) AS _2#7, mapobjects(lambdavariable(MapObject, ObjectType(class java.lang.Object), true, -3), mapobjects(lambdavariable(MapObject, ObjectType(class java.lang.Object), true, -4), assertnotnull(validateexternaltype(lambdavariable(MapObject, ObjectType(class java.lang.Object), true, -4), IntegerType, IntegerType)), validateexternaltype(lambdavariable(MapObject, ObjectType(class java.lang.Object), true, -3), ArrayType(IntegerType,false), ObjectType(interface scala.collection.Seq)), None), knownnotnull(assertnotnull(input[0, scala.Tuple5, true]))._3, None) AS _3#8, staticinvoke(class org.apache.spark.unsafe.types.UTF8String, StringType, fromString, knownnotnull(assertnotnull(input[0, scala.Tuple5, true]))._4, true, false, true) AS _4#9, mapobjects(lambdavariable(MapObject, ObjectType(class java.lang.Object), true, -5), mapobjects(lambdavariable(MapObject, ObjectType(class java.lang.Object), true, -6), if (isnull(validateexternaltype(lambdavariable(MapObject, ObjectType(class java.lang.Object), true, -6), StructField(PARTNAME,StringType,true), StructField(PartNumber,StringType,true), StructField(PartPrice,DoubleType,false), ObjectType(class $line14.$read$$iw$$iw$$iw$$iw$$iw$$iw$$iw$$iw$partClass)))) null else named_struct(PARTNAME, staticinvoke(class org.apache.spark.unsafe.types.UTF8String, StringType, fromString, knownnotnull(validateexternaltype(lambdavariable(MapObject, ObjectType(class java.lang.Object), true, -6), StructField(PARTNAME,StringType,true), StructField(PartNumber,StringType,true), StructField(PartPrice,DoubleType,false), ObjectType(class $line14.$read$$iw$$iw$$iw$$iw$$iw$$iw$$iw$$iw$partClass))).PARTNAME, true, false, true), PartNumber, staticinvoke(class org.apache.spark.unsafe.types.UTF8String, StringType, fromString, knownnotnull(validateexternaltype(lambdavariable(MapObject, ObjectType(class java.lang.Object), true, -6), StructField(PARTNAME,StringType,true), StructField(PartNumber,StringType,true), StructField(PartPrice,DoubleType,false), ObjectType(class $line14.$read$$iw$$iw$$iw$$iw$$iw$$iw$$iw$$iw$partClass))).PartNumber, true, false, true), PartPrice, knownnotnull(validateexternaltype(lambdavariable(MapObject, ObjectType(class java.lang.Object), true, -6), StructField(PARTNAME,StringType,true), StructField(PartNumber,StringType,true), StructField(PartPrice,DoubleType,false), ObjectType(class $line14.$read$$iw$$iw$$iw$$iw$$iw$$iw$$iw$$iw$partClass))).PartPrice), validateexternaltype(lambdavariable(MapObject, ObjectType(class java.lang.Object), true, -5), ArrayType(StructType(StructField(PARTNAME,StringType,true),StructField(PartNumber,StringType,true),StructField(PartPrice,DoubleType,false)),true), ObjectType(interface scala.collection.Seq)), None), knownnotnull(assertnotnull(input[0, scala.Tuple5, true]))._5, None) AS _5#10] +- Scan[obj#5] Because the explode function can create multiple rows from a single row , we should account for the memory available when adding rows to the buffer . This is even more important when we are exploding nested arrays . -- This message was sent by Atlassian Jira (v8.20.10#820010) --------------------------------------------------------------------- To unsubscribe, e-mail: issues-unsubscr...@spark.apache.org For additional commands, e-mail: issues-h...@spark.apache.org