Github user fhueske commented on a diff in the pull request:
https://github.com/apache/flink/pull/4355#discussion_r135134994
--- Diff:
flink-libraries/flink-table/src/main/scala/org/apache/flink/table/codegen/AggregationCodeGenerator.scala
---
@@ -161,13 +182,108 @@ class AggregationCodeGenerator(
}
}
+ /**
+ * Adds a reusable [[org.apache.flink.table.api.dataview.DataView]]
to the open, cleanup,
+ * close and member area of the generated function.
+ *
+ */
+ def addReusableDataViews: Unit = {
+ if (accConfig != null && accConfig.isStateBackedDataViews) {
+ val descMapping: Map[String, StateDescriptor[_, _]] =
accConfig.accSpecs
+ .flatMap(specs => specs.map(s => (s.id, s.toStateDescriptor)))
+ .toMap[String, StateDescriptor[_, _]]
+
+ for (i <- aggs.indices) yield {
+ for (spec <- accConfig.accSpecs(i)) yield {
+ val dataViewField = spec.field
+ val dataViewTypeTerm = dataViewField.getType.getCanonicalName
+ val desc = descMapping.getOrElse(spec.id,
+ throw new CodeGenException(s"Can not find ListView in
accumulator by id: ${spec.id}"))
+
+ // define the DataView variables
+ val serializedData = AggregateUtil.serialize(desc)
+ val dataViewFieldTerm = AggregateUtil.createDataViewTerm(i,
dataViewField.getName)
+ val field =
+ s"""
+ |transient $dataViewTypeTerm $dataViewFieldTerm = null;
+ |""".stripMargin
+ reusableMemberStatements.add(field)
+
+ // create DataViews
+ val descFieldTerm = s"${dataViewFieldTerm}_desc"
+ val descClassQualifier = classOf[StateDescriptor[_,
_]].getCanonicalName
+ val descDeserialize =
+ s"""
+ | $descClassQualifier $descFieldTerm =
($descClassQualifier)
+ | ${AggregateUtil.getClass.getName.stripSuffix("$")}
+ | .deserialize("$serializedData");
+ """.stripMargin
--- End diff --
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