HIVE-29245: Normalize Java license headers, part 1 - illegal Javadoc (#6125)

* Add RegexpHeader

* Don't run RAT for checkstyle

* HIVE-29245: Normalize Java license headers, part 1 - illegal Javadoc

* Fix checkstyle.xml

* Revert avro-generated files

* Raise the severity of RegexpHeader

Author: okumin

checkstyle/asf.header.incremental

@@ -0,0 +1,3 @@
+^\/\*$
+^( \*| \* +.*)$
+^ \*\/$

checkstyle/checkstyle.xml

@@ -64,6 +64,13 @@
   <module name="Header">
     <property name="headerFile" value="${config_loc}/asf.header"/>
   </module>
+  <!-- HIVE-29245: An incremental process to normalize headers. We will finally remove the following one -->
+  <module name="RegexpHeader">
+    <property name="severity" value="error"/>
+    <property name="headerFile" value="${config_loc}/asf.header.incremental"/>
+    <property name="fileExtensions" value="java"/>
+    <property name="multiLines" value="2"/>
+  </module>
 
   <!-- Maximum file line length -->
   <module name="FileLength">

checkstyle/suppressions.xml

@@ -25,4 +25,10 @@
   <suppress checks=".*" files="gen\-java"/>
   <!-- Ignore JDBM code -->
   <suppress checks=".*" files="ql\/util\/jdbm"/>
+  <!-- Copies of an external libraries -->
+  <suppress checks="RegexpHeader" files="serde\/src\/java\/org\/apache\/hadoop\/hive\/serde2\/lazy\/fast\/StringToDouble\.java"/>
+  <suppress checks="RegexpHeader" files="llap-server\/src\/java\/org\/apache\/hadoop\/hive\/llap\/daemon\/impl\/PriorityBlockingDeque\.java"/>
+  <!-- Generated by Avro -->
+  <suppress checks="RegexpHeader" files="hbase-handler\/src\/test\/org\/apache\/hadoop\/hive\/hbase\/avro\/.*\.java"/>
+  <suppress checks="RegexpHeader" files="kafka-handler\/src\/test\/gen\/org\/apache\/hadoop\/hive\/kafka\/SimpleRecord\.java"/>
 </suppressions>

common/src/java/org/apache/hadoop/hive/common/GcTimeMonitor.java

@@ -1,4 +1,4 @@
-/**
+/*
  * 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

common/src/java/org/apache/hadoop/hive/common/type/Date.java

@@ -1,4 +1,4 @@
-/**
+/*
  * 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

common/src/java/org/apache/hadoop/hive/common/type/Timestamp.java

@@ -1,4 +1,4 @@
-/**
+/*
  * 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

common/src/java/org/apache/hive/common/util/CleanerUtil.java

@@ -1,4 +1,4 @@
-/**
+/*
  * 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

itests/hive-jmh/src/main/java/org/apache/hive/benchmark/vectorization/BlackholeOperator.java

@@ -1,4 +1,4 @@
-/**
+/*
  * Licensed 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

itests/hive-jmh/src/main/java/org/apache/hive/benchmark/vectorization/operators/AbstractOperatorBench.java

@@ -1,4 +1,4 @@
-/**
+/*
  * 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

itests/hive-jmh/src/main/java/org/apache/hive/benchmark/vectorization/operators/VectorGroupByOperatorBench.java

@@ -1,4 +1,4 @@
-/**
+/*
  * 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