Github user rxin commented on a diff in the pull request:
https://github.com/apache/spark/pull/13367#discussion_r64976454
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/aggregate/interfaces.scala
---
@@ -24,38 +24,49 @@ import
org.apache.spark.sql.catalyst.expressions.codegen.CodegenFallback
import org.apache.spark.sql.types._
/** The mode of an [[AggregateFunction]]. */
-private[sql] sealed trait AggregateMode
+private[sql] sealed trait AggregateMode {
+ /** Prefix used in explain to indicate the aggregate mode. */
+ def prefix: String
+}
/**
* An [[AggregateFunction]] with [[Partial]] mode is used for partial
aggregation.
* This function updates the given aggregation buffer with the original
input of this
* function. When it has processed all input rows, the aggregation buffer
is returned.
*/
-private[sql] case object Partial extends AggregateMode
+private[sql] case object Partial extends AggregateMode {
+ override def prefix: String = "partial_"
+}
/**
* An [[AggregateFunction]] with [[PartialMerge]] mode is used to merge
aggregation buffers
* containing intermediate results for this function.
* This function updates the given aggregation buffer by merging multiple
aggregation buffers.
* When it has processed all input rows, the aggregation buffer is
returned.
*/
-private[sql] case object PartialMerge extends AggregateMode
+private[sql] case object PartialMerge extends AggregateMode {
+ override def prefix: String = "merge_"
+}
/**
* An [[AggregateFunction]] with [[Final]] mode is used to merge
aggregation buffers
* containing intermediate results for this function and then generate
final result.
* This function updates the given aggregation buffer by merging multiple
aggregation buffers.
* When it has processed all input rows, the final result of this function
is returned.
*/
-private[sql] case object Final extends AggregateMode
+private[sql] case object Final extends AggregateMode {
+ override def prefix: String = ""
+}
/**
* An [[AggregateFunction]] with [[Complete]] mode is used to evaluate
this function directly
* from original input rows without any partial aggregation.
* This function updates the given aggregation buffer with the original
input of this
* function. When it has processed all input rows, the final result of
this function is returned.
*/
-private[sql] case object Complete extends AggregateMode
+private[sql] case object Complete extends AggregateMode {
--- End diff --
because they are final and complete?
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