Github user twalthr commented on a diff in the pull request:
https://github.com/apache/flink/pull/1465#discussion_r49441770
--- Diff:
flink-staging/flink-table/src/main/scala/org/apache/flink/api/table/typeinfo/NullAwareComparator.scala
---
@@ -0,0 +1,186 @@
+/*
+ * 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 org.apache.flink.api.common.typeutils.TypeComparator
+import org.apache.flink.core.memory.{MemorySegment, DataOutputView,
DataInputView}
+
+/**
+ * Null-aware comparator that wraps a comparator which does not support
null references.
+ */
+class NullAwareComparator[T](
+ val wrappedComparator: TypeComparator[T],
--- End diff --
Are you sure we want to limit rows to atomic types only?
Why should the wrapping not work for composite types? If you have a look
into my test cases, I already test Tuples and Pojos successfully.
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