licenses and javadoc cleanup

Author: mspruc

wayang-api/wayang-api-sql/src/main/java/org/apache/wayang/api/sql/calcite/converter/WayangMultiConditionJoinVisitor.java

@@ -134,14 +134,12 @@ Operator visit(WayangJoin wayangRelNode) {
     }
 
     /**
-     * This method handles the {@link JoinOperator} creation, used in conjunction
-     * with:
-     * {@link #determineKeyExtractionDirection(Integer, Integer, WayangJoin)}
+     * This method handles the {@link JoinOperator} creation
      * 
      * @param wayangRelNode
      * @param leftKeyIndex
      * @param rightKeyIndex
-     * @return a {@link JoinOperator} with {@link KeyExtractors} set
+     * @return 
      */
     protected JoinOperator<Record, Record, Record> getJoinOperator(final Integer[] leftKeyIndexes,
             final Integer[] rightKeyIndexes,

wayang-api/wayang-api-sql/src/main/java/org/apache/wayang/api/sql/calcite/converter/WayangSortVisitor.java

@@ -1,3 +1,20 @@
+/*
+ * 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.wayang.api.sql.calcite.converter;
 
 import java.util.List;

wayang-api/wayang-api-sql/src/main/java/org/apache/wayang/api/sql/calcite/rel/WayangSort.java

@@ -1,3 +1,20 @@
+/*
+ * 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.wayang.api.sql.calcite.rel;
 
 import org.apache.calcite.plan.RelOptCluster;

wayang-api/wayang-api-sql/src/main/java/org/apache/wayang/api/sql/calcite/rules/WayangSortRule.java

@@ -1,3 +1,20 @@
+/*
+ * 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.wayang.api.sql.calcite.rules;
 
 import org.apache.calcite.plan.Convention;