Github user tillrohrmann commented on a diff in the pull request:
https://github.com/apache/flink/pull/1465#discussion_r47903321
--- Diff:
flink-staging/flink-table/src/main/scala/org/apache/flink/api/table/typeinfo/RowComparator.scala
---
@@ -0,0 +1,468 @@
+/*
+ * 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.flink.api.table.typeinfo
+
+import java.util
+
+import org.apache.flink.api.common.typeutils.base.BasicTypeComparator
+import org.apache.flink.api.common.typeutils.{CompositeTypeComparator,
TypeComparator, TypeSerializer}
+import org.apache.flink.api.java.typeutils.runtime.TupleComparatorBase
+import org.apache.flink.api.table.Row
+import org.apache.flink.api.table.typeinfo.NullMaskUtils.readIntoNullMask
+import org.apache.flink.api.table.typeinfo.RowComparator.NullChecker
+import org.apache.flink.core.memory.{MemorySegment, DataOutputView,
DataInputView}
+import org.apache.flink.types.{KeyFieldOutOfBoundsException,
NullKeyFieldException}
+
+/**
+ * Comparator for [[Row]].
+ */
+class RowComparator private (
+ /** key positions describe which fields are keys in what order */
+ val keyPositions: Array[Int],
+ /** comparators for the key fields, in the same order as the key
fields */
+ val comparators: Array[TypeComparator[_]],
+ /** serializers to deserialize the first n fields for comparison */
+ val serializers: Array[TypeSerializer[_]],
+ /** auxiliary fields for normalized key support */
+ private var normalizedKeyLengths: Array[Int],
--- End diff --
Why is this a `var`? Can't it be a `val`?
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