Github user holdenk commented on a diff in the pull request:

    https://github.com/apache/spark/pull/12580#discussion_r60664717
  
    --- Diff: sql/hive-1-x-compatibility/pom.xml ---
    @@ -0,0 +1,74 @@
    +<?xml version="1.0" encoding="UTF-8"?>
    +<!--
    +  ~ 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.
    +  -->
    +
    +<project xmlns="http://maven.apache.org/POM/4.0.0"; 
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance";
    +         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 
http://maven.apache.org/xsd/maven-4.0.0.xsd";>
    +    <modelVersion>4.0.0</modelVersion>
    +    <parent>
    +        <groupId>org.apache.spark</groupId>
    +        <artifactId>spark-parent_2.11</artifactId>
    +        <version>2.0.0-SNAPSHOT</version>
    +        <relativePath>../../pom.xml</relativePath>
    +    </parent>
    +
    +    <groupId>org.apache.spark</groupId>
    +    <artifactId>spark-hive-1-x-compatibility_2.11</artifactId>
    +    <packaging>jar</packaging>
    +    <name>Spark Project Hive 1.x Compatibility</name>
    +    <url>http://spark.apache.org/</url>
    +    <properties>
    +        <sbt.project.name>hive-1-x-compatibility</sbt.project.name>
    +    </properties>
    +
    +    <dependencies>
    +        <dependency>
    +            <groupId>org.apache.spark</groupId>
    +            <artifactId>spark-hive_${scala.binary.version}</artifactId>
    +            <version>${project.version}</version>
    +        </dependency>
    +    </dependencies>
    +
    +    <build>
    +        
<outputDirectory>target/scala-${scala.binary.version}/classes</outputDirectory>
    +        
<testOutputDirectory>target/scala-${scala.binary.version}/test-classes</testOutputDirectory>
    +        <pluginManagement>
    +            <plugins>
    +                <plugin>
    +                    <groupId>net.alchim31.maven</groupId>
    +                    <artifactId>scala-maven-plugin</artifactId>
    +                    <configuration>
    +                        <javacArgs combine.children="append">
    +                            <!-- This option is needed to suppress 
warnings from sun.misc.Unsafe usage -->
    +                            <javacArg>-XDignore.symbol.file</javacArg>
    +                        </javacArgs>
    +                    </configuration>
    +                </plugin>
    +                <plugin>
    +                    <groupId>org.apache.maven.plugins</groupId>
    +                    <artifactId>maven-compiler-plugin</artifactId>
    +                    <configuration>
    +                        <compilerArgs combine.children="append">
    +                            <!-- This option is needed to suppress 
warnings from sun.misc.Unsafe usage -->
    +                            <arg>-XDignore.symbol.file</arg>
    --- End diff --
    
    Supressing warnings for sun.misc.unsafe sounds good, but do we need it in 
the hive compatibility shims project (this does suppress other warnings that we 
might want to see if we aren't planning on using sun.misc.unsafe here)?


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