cloud-fan commented on a change in pull request #25024: [SPARK-27296][SQL]
Allows Aggregator to be registered as a UDF
URL: https://github.com/apache/spark/pull/25024#discussion_r363607371
##########
File path:
sql/core/src/main/scala/org/apache/spark/sql/execution/aggregate/udaf.scala
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@@ -450,3 +454,65 @@ case class ScalaUDAF(
override def nodeName: String = udaf.getClass.getSimpleName
}
+
+case class ScalaAggregator[IN, BUF, OUT](
+ children: Seq[Expression],
+ agg: Aggregator[IN, BUF, OUT],
+ inputEncoderNR: ExpressionEncoder[IN],
+ isNullable: Boolean = true,
+ isDeterministic: Boolean = true,
+ mutableAggBufferOffset: Int = 0,
+ inputAggBufferOffset: Int = 0)
+ extends TypedImperativeAggregate[BUF]
+ with NonSQLExpression
+ with UserDefinedExpression
+ with ImplicitCastInputTypes
+ with Logging {
+
+ private[this] lazy val inputEncoder = inputEncoderNR.resolveAndBind()
+ private[this] lazy val bufferEncoder =
+ agg.bufferEncoder.asInstanceOf[ExpressionEncoder[BUF]].resolveAndBind()
+ private[this] lazy val outputEncoder =
agg.outputEncoder.asInstanceOf[ExpressionEncoder[OUT]]
+
+ def dataType: DataType = outputEncoder.objSerializer.dataType
+
+ def inputTypes: Seq[DataType] = inputEncoder.schema.map(_.dataType)
+
+ def nullable: Boolean = isNullable
Review comment:
nit: we can follow `ScalaUDF` and name the parameter as `nullable`. Then we
don't need to override here.
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