danny0405 commented on a change in pull request #1733: [CALCITE-3679] Allow lambda expressions in SQL queries URL: https://github.com/apache/calcite/pull/1733#discussion_r396054045
########## File path: core/src/main/java/org/apache/calcite/sql/SqlLambda.java ########## @@ -0,0 +1,88 @@ +/* + * 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.calcite.sql; + +import org.apache.calcite.sql.fun.SqlLambdaOperator; +import org.apache.calcite.sql.parser.SqlParserPos; +import org.apache.calcite.util.UnmodifiableArrayList; + +import java.util.List; + +/** + * A <code>SqlLambda</code> is a node of a parse tree which represents a lambda statement. It + * warrants * its own node type just because we have a lot of methods to put somewhere. + */ +public class SqlLambda extends SqlCall { + + SqlNodeList parameters; + SqlNode expression; + + //~ Constructors ----------------------------------------------------------- + + + public SqlLambda(SqlParserPos pos, SqlNodeList parameters, + SqlNode expression) { + super(pos); + this.parameters = parameters; + this.expression = expression; + } + + /** + * Creates a call to the lambda operator + * + * <br>LAMBDA<br> + */ + public static SqlLambda createLambda(SqlParserPos pos, SqlNodeList parameters, + SqlNode expression) { + return new SqlLambda(pos, parameters, expression); + } + + //~ Methods ---------------------------------------------------------------- + + @Override public SqlKind getKind() { + return SqlKind.LAMBDA; + } + + public SqlOperator getOperator() { + return SqlLambdaOperator.INSTANCE; + } + + public List<SqlNode> getOperandList() { + return UnmodifiableArrayList.of(parameters, expression); + } + + @Override public void setOperand(int i, SqlNode operand) { + switch (i) { + case 0: + parameters = (SqlNodeList) operand; + break; + case 1: + expression = operand; + break; + default: + throw new AssertionError(i); + } + } + + public SqlNodeList getParameters() { + return parameters; + } + Review comment: Unparse the `SqlLambda` correctly. ---------------------------------------------------------------- This is an automated message from the Apache Git Service. To respond to the message, please log on to GitHub and use the URL above to go to the specific comment. For queries about this service, please contact Infrastructure at: [email protected] With regards, Apache Git Services
