Github user wuchong commented on a diff in the pull request:
https://github.com/apache/flink/pull/4355#discussion_r134138469
--- Diff:
flink-libraries/flink-table/src/main/scala/org/apache/flink/table/codegen/CodeGenerator.scala
---
@@ -1646,4 +1649,86 @@ abstract class CodeGenerator(
fieldTerm
}
+
+ /**
+ * Adds a reusable class to the member area of the generated
[[Function]].
+ */
+ def addReusableClass(clazz: Class[_], fieldTerm: String): Unit = {
+ val field =
+ s"""
+ |transient ${clazz.getCanonicalName} $fieldTerm = null;
+ |""".stripMargin
+ reusableMemberStatements.add(field)
+ }
+
+ /**
+ * Adds a reusable [[DataViewConfig]] to the member area of the
generated [[Function]].
+ *
+ * @param indices indices of aggregate functions.
+ * @param ctxTerm field name of runtime context.
+ * @param accConfig data view config which contains id, field and
StateDescriptos.
+ * @return statements to create [[MapView]] or [[ListView]].
+ */
+ def addReusableDataViewConfig(
--- End diff --
The `addReusableDataViewConfig` should be in `AggregateCodeGenerator`. And
I would like to change this method to `addReusableDataView(spec: DataViewSpec):
String`, the returned String is the dataview member variable term. And the
dataview creation code can be added into `reusableDataViewStatements`. And the
code of `reusableDataViewStatements` can be added to `initialize(ctx)` (or
`open(ctx)` as I suggested) at last.
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