| /* |
| * 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.drill.exec.planner.sql.parser; |
| |
| import java.util.ArrayList; |
| import java.util.List; |
| |
| import org.apache.calcite.sql.SqlNode; |
| import org.apache.calcite.sql.SqlOperator; |
| import org.apache.calcite.sql.parser.SqlParserPos; |
| import org.apache.calcite.sql.parser.SqlParserUtil; |
| |
| /** |
| * Helper methods or constants used in parsing a SQL query. |
| */ |
| public class DrillParserUtil { |
| |
| private static final int CONDITION_LIST_CAPACITY = 3; |
| |
| /** |
| * System-depended end of line character |
| */ |
| public static final String EOL = System.lineSeparator(); |
| |
| public static SqlNode createCondition(SqlNode left, SqlOperator op, SqlNode right) { |
| |
| // if one of the operands is null, return the other |
| if (left == null) { |
| return right; |
| } else if (right == null) { |
| return left; |
| } |
| |
| List<Object> listCondition = new ArrayList<>(CONDITION_LIST_CAPACITY); |
| listCondition.add(left); |
| listCondition.add(new SqlParserUtil.ToTreeListItem(op, SqlParserPos.ZERO)); |
| listCondition.add(right); |
| |
| return SqlParserUtil.toTree(listCondition); |
| } |
| |
| } |