Github user tdas commented on a diff in the pull request:
https://github.com/apache/spark/pull/19467#discussion_r144434463
--- Diff:
sql/core/src/test/scala/org/apache/spark/sql/streaming/StatefulOperatorTest.scala
---
@@ -0,0 +1,49 @@
+/*
+ * 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.streaming
+
+import org.apache.spark.sql.catalyst.plans.physical._
+import org.apache.spark.sql.execution.streaming._
+
+trait StatefulOperatorTest {
+ /**
+ * Check that the output partitioning of a child operator of a Stateful
operator satisfies the
+ * distribution that we expect for our Stateful operator.
+ */
+ protected def checkChildOutputPartitioning[T <: StatefulOperator](
--- End diff --
since this is only for HashPartitioning, how about
checkChildOutputHashPartitioning
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