| // 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. |
| // This file is copied from |
| // https://github.com/apache/impala/blob/branch-2.9.0/fe/src/main/java/org/apache/impala/ToSqlUtils.java |
| // and modified by Doris |
| |
| package org.apache.doris.analysis; |
| |
| import com.google.common.collect.Lists; |
| |
| import java.util.List; |
| |
| /** |
| * Contains utility methods for creating SQL strings, for example, |
| * for creating identifier strings that are compatible with Hive or Impala. |
| */ |
| public class ToSqlUtils { |
| /** |
| * Given an unquoted identifier string, returns an identifier lexable by |
| * Impala and Hive, possibly by enclosing the original identifier in "`" quotes. |
| * For example, Hive cannot parse its own auto-generated column |
| * names "_c0", "_c1" etc. unless they are quoted. Impala and Hive keywords |
| * must also be quoted. |
| * |
| * Impala's lexer recognizes a superset of the unquoted identifiers that Hive can. |
| * At the same time, Impala's and Hive's list of keywords differ. |
| * This method always returns an identifier that Impala and Hive can recognize, |
| * although for some identifiers the quotes may not be strictly necessary for |
| * one or the other system. |
| */ |
| public static String getIdentSql(String ident) { |
| return ident; |
| } |
| |
| public static List<String> getIdentSqlList(List<String> identList) { |
| List<String> identSqlList = Lists.newArrayList(); |
| for (String ident : identList) { |
| identSqlList.add(getIdentSql(ident)); |
| } |
| return identSqlList; |
| } |
| } |