The class org.apache.flink.table.planner.plan.nodes.exec.stream.StreamExecCalc in
this artifact is a modified version developed by Apache Auron: it redirects Calc
execution to Auron's native engine. It replaces the stock flink-table-planner class
of the same name (Apache License 2.0, Section 4(b)).

This artifact bundles org.apache.kafka:kafka-clients, whose required attribution
is reproduced below (kafka-clients ships it in its jar-root NOTICE):

  This project contains the following code copied from Apache Hadoop:
  clients/src/main/java/org/apache/kafka/common/utils/PureJavaCrc32C.java
  Some portions of this file Copyright (c) 2004-2006 Intel Corporation and licensed
  under the BSD license.

  The streams-scala module was donated by Lightbend and the original code was
  copyrighted by them:
  Copyright (C) 2018 Lightbend Inc. <https://www.lightbend.com>
  Copyright (C) 2017-2018 Alexis Seigneurin.
