| /* |
| * 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.flink.table.functions.sql |
| |
| import java.util |
| |
| import com.google.common.collect.ImmutableList |
| import org.apache.calcite.rel.`type`.{RelDataType, RelDataTypeFactory} |
| import org.apache.calcite.sql._ |
| import org.apache.calcite.sql.`type`._ |
| |
| class SqlFirstLastValueAggFunction(kind: SqlKind) extends SqlAggFunction( |
| kind.name(), |
| null.asInstanceOf[SqlIdentifier], |
| kind, |
| ReturnTypes.ARG0_NULLABLE_IF_EMPTY, |
| null.asInstanceOf[SqlOperandTypeInference], |
| OperandTypes.or(OperandTypes.ANY, OperandTypes.family(SqlTypeFamily.ANY, SqlTypeFamily.ANY)), |
| SqlFunctionCategory.NUMERIC, |
| false, |
| false) { |
| override def getParameterTypes(typeFactory: RelDataTypeFactory): util.List[RelDataType] = |
| ImmutableList.of( |
| typeFactory.createTypeWithNullability(typeFactory.createSqlType(SqlTypeName.ANY),true), |
| typeFactory.createTypeWithNullability(typeFactory.createSqlType(SqlTypeName.ANY), true)) |
| |
| override def getReturnType(typeFactory: RelDataTypeFactory): RelDataType = |
| typeFactory.createTypeWithNullability(typeFactory.createSqlType(SqlTypeName.ANY), true) |
| |
| } |
