src/main/config/checkstyle/suppressions.xml

<?xml version="1.0"?>
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<!DOCTYPE suppressions PUBLIC
        "-//Puppy Crawl//DTD Suppressions 1.1//EN"
        "http://www.puppycrawl.com/dtds/suppressions_1_1.dtd">
<!--
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.
-->
<suppressions>
  <!-- Don't complain about field names such as cust_id -->
  <suppress checks=".*Name" files="JdbcExample.java"/>

  <!-- Don't complain about field names such as cust_id -->
  <suppress checks=".*Name" files="src[/\\]main[/\\]java[/\\]org[/\\]apache[/\\]calcite[/\\]test[/\\]schemata[/\\]"/>

  <!-- Documenting test schema-related packages adds little value -->
  <suppress checks="JavadocPackage" files="src[/\\]main[/\\]java[/\\]org[/\\]apache[/\\]calcite[/\\]test[/\\]schemata[/\\]"/>

  <!-- Don't complain about method names in a class full of UDFs -->
  <suppress checks="MethodName" files="GeoFunctions.java"/>

  <!-- Suppress JavadocPackage in the test packages,
       and in the 'org.apache.calcite.server' package, which is split between
       'core' and 'server'. -->
  <suppress checks="JavadocPackage" files="src[/\\]test[/\\]java[/\\]"/>
  <suppress checks="JavadocPackage" files="src[/\\]main[/\\]java[/\\]org[/\\]apache[/\\]calcite[/\\]server[/\\]"/>

  <!-- Method names in Resource can have underscores -->
  <suppress checks="MethodName" files="CalciteResource.java"/>
</suppressions>