/**
* Copyright (C) 2014-2016 LinkedIn Corp. (pinot-core@linkedin.com)
*
* 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
*
* 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 com.linkedin.pinot.pql.parsers.pql2.ast;
import com.linkedin.pinot.common.request.BrokerRequest;
import com.linkedin.pinot.common.request.Selection;
import com.linkedin.pinot.common.request.SelectionSort;
import com.linkedin.pinot.pql.parsers.Pql2CompilationException;
/**
* AST node for ORDER BY clauses.
*/
public class OrderByAstNode extends BaseAstNode {
@Override
public void updateBrokerRequest(BrokerRequest brokerRequest) {
Selection selections = brokerRequest.getSelections();
for (AstNode astNode : getChildren()) {
if (astNode instanceof OrderByExpressionAstNode) {
OrderByExpressionAstNode node = (OrderByExpressionAstNode) astNode;
SelectionSort elem = new SelectionSort();
elem.setColumn(node.getColumn());
elem.setIsAsc("asc".equalsIgnoreCase(node.getOrdering()));
selections.addToSelectionSortSequence(elem);
} else {
throw new Pql2CompilationException("Child node of ORDER BY node is not an expression node");
}
}
}
}