| /* |
| * 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.drill.udf.dynamic; |
| |
| import io.netty.buffer.DrillBuf; |
| import org.apache.drill.exec.expr.DrillSimpleFunc; |
| import org.apache.drill.exec.expr.annotations.FunctionTemplate; |
| import org.apache.drill.exec.expr.annotations.Output; |
| import org.apache.drill.exec.expr.annotations.Param; |
| import org.apache.drill.exec.expr.holders.VarCharHolder; |
| |
| import javax.inject.Inject; |
| import java.nio.charset.StandardCharsets; |
| |
| @FunctionTemplate( |
| name="custom_upper", |
| scope = FunctionTemplate.FunctionScope.SIMPLE, |
| nulls = FunctionTemplate.NullHandling.NULL_IF_NULL |
| ) |
| public class CustomUpperFunction implements DrillSimpleFunc { |
| |
| @Param |
| VarCharHolder input; |
| |
| @Output |
| VarCharHolder output; |
| |
| @Inject |
| DrillBuf buffer; |
| |
| public void setup() { |
| } |
| |
| public void eval() { |
| |
| // get value |
| String inputString = org.apache.drill.exec.expr.fn.impl.StringFunctionHelpers.toStringFromUTF8(input.start, input.end, input.buffer); |
| |
| // convert to upper case |
| String outputValue = inputString.toUpperCase(); |
| |
| // put the output value into output buffer |
| output.buffer = buffer; |
| output.start = 0; |
| output.end = outputValue.getBytes(StandardCharsets.UTF_8).length; |
| buffer.setBytes(0, outputValue.getBytes(StandardCharsets.UTF_8)); |
| |
| } |
| } |
| |