Github user HeartSaVioR commented on a diff in the pull request:
https://github.com/apache/spark/pull/21733#discussion_r206778971
--- Diff:
sql/core/src/main/scala/org/apache/spark/sql/execution/streaming/StatefulOperatorsHelper.scala
---
@@ -0,0 +1,137 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements. See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License. You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.apache.spark.sql.execution.streaming
+
+import org.apache.spark.internal.Logging
+import org.apache.spark.sql.catalyst.InternalRow
+import org.apache.spark.sql.catalyst.expressions.{Attribute, UnsafeRow}
+import
org.apache.spark.sql.catalyst.expressions.codegen.{GenerateUnsafeProjection,
GenerateUnsafeRowJoiner}
+import org.apache.spark.sql.execution.streaming.state.{StateStore,
UnsafeRowPair}
+import org.apache.spark.sql.types.StructType
+
+object StatefulOperatorsHelper {
+
+ val supportedVersions = Seq(1, 2)
+ val legacyVersion = 1
+
+ sealed trait StreamingAggregationStateManager extends Serializable {
+ def extractKey(row: InternalRow): UnsafeRow
+ def getValueExpressions: Seq[Attribute]
--- End diff --
It is to define the schema of value from / to state. For V1 it would be
same to input schema and for V2 it would be `input schema - key schema`. Would
`getStateValueExpressions` be OK for us?
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