Github user brkyvz commented on a diff in the pull request:
https://github.com/apache/spark/pull/19271#discussion_r139844415
--- Diff:
sql/core/src/main/scala/org/apache/spark/sql/execution/streaming/state/SymmetricHashJoinStateManager.scala
---
@@ -0,0 +1,405 @@
+/*
+ * 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.state
+
+import scala.reflect.ClassTag
+
+import org.apache.hadoop.conf.Configuration
+
+import org.apache.spark.{Partition, SparkContext, TaskContext}
+import org.apache.spark.internal.Logging
+import org.apache.spark.rdd.{RDD, ZippedPartitionsRDD2}
+import org.apache.spark.sql.catalyst.expressions.{Attribute,
AttributeReference, BindReferences, Expression, LessThanOrEqual, Literal,
SpecificInternalRow, UnsafeProjection, UnsafeRow}
+import org.apache.spark.sql.catalyst.expressions.codegen.Predicate
+import
org.apache.spark.sql.execution.streaming.{StatefulOperatorStateInfo,
StreamingSymmetricHashJoinExec}
+import
org.apache.spark.sql.execution.streaming.StreamingSymmetricHashJoinHelper._
+import org.apache.spark.sql.types.{LongType, StructField, StructType}
+import org.apache.spark.util.NextIterator
+
+/**
+ * Helper class to manage state required by a single side of
[[StreamingSymmetricHashJoinExec]].
+ * The interface of this class is basically that of a multi-map:
+ * - Get: Returns an iterator of multiple values for given key
+ * - Append: Append a new value to the given key
+ * - Remove Data by predicate: Drop any state using a predicate condition
on keys or values
+ *
+ * @param joinSide Defines the join side
--- End diff --
nit: why the weird indentation
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