| /** |
| * 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.tajo.engine.function.datetime; |
| |
| import org.apache.tajo.common.TajoDataTypes; |
| import org.apache.tajo.datum.Datum; |
| import org.apache.tajo.datum.DatumFactory; |
| import org.apache.tajo.datum.TimestampDatum; |
| import org.apache.tajo.plan.function.GeneralFunction; |
| import org.apache.tajo.engine.function.annotation.Description; |
| import org.apache.tajo.engine.function.annotation.ParamTypes; |
| import org.apache.tajo.storage.Tuple; |
| |
| @Description( |
| functionName = "now", |
| description = "Get current time. Result is TIMESTAMP type.", |
| example = "> SELECT now();\n2014-04-18 22:54:29.280", |
| returnType = TajoDataTypes.Type.TIMESTAMP, |
| paramTypes = {@ParamTypes(paramTypes = {})} |
| ) |
| public class NowTimestamp extends GeneralFunction { |
| TimestampDatum datum; |
| |
| public NowTimestamp() { |
| super(NoArgs); |
| } |
| |
| @Override |
| public Datum eval(Tuple params) { |
| if (datum == null) { |
| datum = DatumFactory.createTimestampDatumWithJavaMillis(System.currentTimeMillis()); |
| } |
| return datum; |
| } |
| } |