/* * This file is part of Splice Machine. * Splice Machine is free software: you can redistribute it and/or modify it under the terms of the * GNU Affero General Public License as published by the Free Software Foundation, either * version 3, or (at your option) any later version. * Splice Machine is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; * without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. * See the GNU Affero General Public License for more details. * You should have received a copy of the GNU Affero General Public License along with Splice Machine. * If not, see <http://www.gnu.org/licenses/>. * * Some parts of this source code are based on Apache Derby, and the following notices apply to * Apache Derby: * * Apache Derby is a subproject of the Apache DB project, and is licensed under * the Apache License, Version 2.0 (the "License"); you may not use these files * 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. * * Splice Machine, Inc. has modified the Apache Derby code in this file. * * All such Splice Machine modifications are Copyright 2012 - 2020 Splice Machine, Inc., * and are licensed to you under the GNU Affero General Public License. */ package com.splicemachine.db.impl.sql.compile; import java.util.Collections; import java.util.List; import com.splicemachine.db.iapi.error.StandardException; import com.splicemachine.db.iapi.services.io.FormatableHashtable; import com.splicemachine.db.shared.common.reference.SQLState; import org.spark_project.guava.collect.Lists; /** * Class that represents a call to the FIRST_VALUE() and LAST_VALUE() window functions. */ public final class FirstLastValueFunctionNode extends WindowFunctionNode { /** * Initializer. QueryTreeNode override. * * @param arg1 The function's definition class * @param arg2 The window definition or reference * @param arg3 The window input operator * @param arg4 Ignore nulls * @param arg5 Function name ("LAST_VALUE" or "FIRST_VALUE") * @throws StandardException */ public void init(Object arg1, Object arg2, Object arg3, Object arg4, Object arg5) throws StandardException { // first/last_value() is only deterministic when the window definition has an ORDER BY clause, that is, we want // column values relative to the current row in some ordered set. However, we're not making the restriction here // to require an ORDER BY clause. See DB-3976 if (arg3 == null) { throw StandardException.newException(SQLState.LANG_MISSING_FIRST_LAST_VALUE_ARG); } super.init(arg3, arg1, Boolean.FALSE, arg5, arg2, arg4); setType(this.operand.getTypeServices()); } @Override public String getName() { return getAggregateName(); } @Override public List<ValueNode> getOperands() { return (operand != null ? Lists.newArrayList(operand) : Collections.EMPTY_LIST); } @Override public void replaceOperand(ValueNode oldVal, ValueNode newVal) { this.operand = newVal; } @Override public FormatableHashtable getFunctionSpecificArgs() { FormatableHashtable container = new FormatableHashtable(); container.put(FirstLastValueFunctionDefinition.IGNORE_NULLS, this.isIgnoreNulls()); return container; } }