maryannxue commented on a change in pull request #29134:
URL: https://github.com/apache/spark/pull/29134#discussion_r456198615
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File path:
sql/core/src/main/scala/org/apache/spark/sql/execution/exchange/ShuffleExchangeExec.scala
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@@ -37,16 +37,30 @@ import org.apache.spark.sql.execution._
import org.apache.spark.sql.execution.metric.{SQLMetric, SQLMetrics,
SQLShuffleReadMetricsReporter, SQLShuffleWriteMetricsReporter}
import org.apache.spark.sql.internal.SQLConf
import org.apache.spark.sql.types.StructType
+import org.apache.spark.sql.vectorized.ColumnarBatch
import org.apache.spark.util.MutablePair
import org.apache.spark.util.collection.unsafe.sort.{PrefixComparators,
RecordComparator}
+/**
+ * Base class for implementations of shuffle exchanges. This was added to
enable plugins to
+ * provide columnar implementations of shuffle exchanges when Adaptive Query
Execution is
+ * enabled.
+ */
+abstract class ShuffleExchange extends Exchange {
+ def shuffleId: Int
+ def getNumMappers: Int
Review comment:
We can get this through MapOutputTracker.
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