Github user cloud-fan commented on a diff in the pull request:
https://github.com/apache/spark/pull/9969#discussion_r45937773
--- Diff:
sql/core/src/main/scala/org/apache/spark/sql/execution/joins/CartesianProduct.scala
---
@@ -17,16 +17,69 @@
package org.apache.spark.sql.execution.joins
-import org.apache.spark.rdd.RDD
+import org.apache.spark._
+import org.apache.spark.rdd.{CartesianPartition, CartesianRDD, RDD}
import org.apache.spark.sql.catalyst.InternalRow
-import org.apache.spark.sql.catalyst.expressions.{Attribute, JoinedRow}
-import org.apache.spark.sql.execution.{BinaryNode, SparkPlan}
+import
org.apache.spark.sql.catalyst.expressions.codegen.GenerateUnsafeRowJoiner
+import org.apache.spark.sql.catalyst.expressions.{Attribute, UnsafeRow}
import org.apache.spark.sql.execution.metric.SQLMetrics
+import org.apache.spark.sql.execution.{BinaryNode, SparkPlan}
+import org.apache.spark.util.CompletionIterator
+import org.apache.spark.util.collection.unsafe.sort.UnsafeExternalSorter
+
+
+private[spark]
+class UnsafeCartesianRDD(rdd1 : RDD[UnsafeRow], rdd2 : RDD[UnsafeRow])
+ extends CartesianRDD[UnsafeRow, UnsafeRow](rdd1.sparkContext, rdd1,
rdd2) {
+
+ override def compute(split: Partition, context: TaskContext):
Iterator[(UnsafeRow, UnsafeRow)] = {
+ val sorter = UnsafeExternalSorter.create(
+ context.taskMemoryManager(),
+ SparkEnv.get.blockManager,
+ context,
+ null,
+ null,
+ 1024,
+ SparkEnv.get.memoryManager.pageSizeBytes)
+
+ val currSplit = split.asInstanceOf[CartesianPartition]
+ var numFields = 0
+ for (y <- rdd2.iterator(currSplit.s2, context)) {
+ numFields = y.numFields()
+ sorter.insertRecord(y.getBaseObject, y.getBaseOffset,
y.getSizeInBytes, 0)
+ }
+
+ def createIter(): Iterator[UnsafeRow] = {
+ val iter = sorter.getIterator
+ val unsafeRow = new UnsafeRow
+ new Iterator[UnsafeRow] {
+ override def hasNext: Boolean = {
+ iter.hasNext
+ }
+ override def next(): UnsafeRow = {
+ iter.loadNext()
+ unsafeRow.pointTo(iter.getBaseObject, iter.getBaseOffset,
numFields, iter.getRecordLength)
+ unsafeRow
+ }
+ }
+ }
+
+ val resultIter =
+ for (x <- rdd1.iterator(currSplit.s1, context);
+ y <- createIter()) yield (x, y)
--- End diff --
does the `UnsafeExternalSorter` preserve records order if it spills?
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