danny0405 commented on code in PR #2844: URL: https://github.com/apache/calcite/pull/2844#discussion_r913726617
########## core/src/main/java/org/apache/calcite/sql/SqlSetSemanticsTableOperator.java: ########## @@ -0,0 +1,95 @@ +/* + * 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.rel.type.RelDataType; +import org.apache.calcite.sql.parser.SqlParserPos; +import org.apache.calcite.sql.validate.SqlValidator; +import org.apache.calcite.sql.validate.SqlValidatorScope; + +import org.checkerframework.checker.nullness.qual.Nullable; + +import java.util.List; + +/** + * SetSemanticsTable appears as an parameter in a table function. + * It represents as an input table with set semantics. + * Set semantics means that the outcome of the function depends on how + * the data is partitioned. + * When the table function is called from a query, the table parameter can + * optionally be extended with either a PARTITION BY clause or + * an ORDER BY clause or both. + * + */ +public class SqlSetSemanticsTableOperator extends SqlInternalOperator { + + //~ Constructors ----------------------------------------------------------- + + public SqlSetSemanticsTableOperator() { + super("SET_SEMANTICS_TABLE", SqlKind.SET_SEMANTICS_TABLE); + } + + @Override public SqlCall createCall( + @Nullable SqlLiteral functionQualifier, + SqlParserPos pos, + @Nullable SqlNode... operands) { + assert operands.length == 3; + SqlNode partitionList = operands[1]; + SqlNode orderList = operands[2]; + assert (partitionList != null && !SqlNodeList.isEmptyList(partitionList)) + || (orderList != null && !SqlNodeList.isEmptyList(orderList)); + return super.createCall(functionQualifier, pos, operands); + } + + @Override public void unparse( + SqlWriter writer, + SqlCall call, + int leftPrec, + int rightPrec) { + call.operand(0).unparse(writer, 0, 0); + + SqlNodeList partitionList = call.operand(1); + if (partitionList.size() > 0) { + writer.sep("PARTITION BY"); + final SqlWriter.Frame partitionFrame = writer.startList("", ""); + partitionList.unparse(writer, 0, 0); + writer.endList(partitionFrame); + } + SqlNodeList orderList = call.operand(2); + if (orderList.size() > 0) { + writer.sep("ORDER BY"); + writer.list( + SqlWriter.FrameTypeEnum.ORDER_BY_LIST, + SqlWriter.COMMA, + orderList); + } + } + + @Override public RelDataType deriveType( + SqlValidator validator, + SqlValidatorScope scope, SqlCall call) { + final List<SqlNode> operands = call.getOperandList(); + assert operands.size() == 3; + RelDataType tableType = validator.deriveType(scope, operands.get(0)); Review Comment: We already assert the operands number on construction. -- 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. To unsubscribe, e-mail: commits-unsubscr...@calcite.apache.org For queries about this service, please contact Infrastructure at: us...@infra.apache.org
