| /* |
| * 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.exec.udfs; |
| |
| import io.netty.buffer.DrillBuf; |
| import org.apache.drill.common.types.TypeProtos.DataMode; |
| import org.apache.drill.common.types.TypeProtos.MinorType; |
| import org.apache.drill.exec.expr.holders.VarCharHolder; |
| import org.apache.drill.exec.vector.complex.reader.FieldReader; |
| import org.apache.drill.exec.vector.complex.writer.BaseWriter; |
| |
| import java.util.Iterator; |
| |
| public class ComplexSchemaUtils { |
| |
| public static void getFields(FieldReader reader, BaseWriter.ComplexWriter outWriter, DrillBuf buffer) { |
| |
| BaseWriter.MapWriter queryMapWriter = outWriter.rootAsMap(); |
| |
| if (reader.getType().getMinorType() != MinorType.MAP) { |
| // If the field is not a map, return an empty map |
| queryMapWriter.start(); |
| queryMapWriter.end(); |
| } |
| |
| Iterator<String> fieldIterator = reader.iterator(); |
| queryMapWriter.start(); |
| |
| while (fieldIterator.hasNext()) { |
| String fieldName = fieldIterator.next(); |
| FieldReader fieldReader = reader.reader(fieldName); |
| String dataType = fieldReader.getType().getMinorType().toString(); |
| |
| DataMode dataMode = fieldReader.getType().getMode(); |
| if (dataMode == DataMode.REPEATED) { |
| dataType = dataMode + "_" + dataType; |
| } |
| |
| VarCharHolder rowHolder = new VarCharHolder(); |
| byte[] rowStringBytes = dataType.getBytes(); |
| buffer.reallocIfNeeded(rowStringBytes.length); |
| buffer.setBytes(0, rowStringBytes); |
| |
| rowHolder.start = 0; |
| rowHolder.end = rowStringBytes.length; |
| rowHolder.buffer = buffer; |
| |
| queryMapWriter.varChar(fieldName).write(rowHolder); |
| } |
| queryMapWriter.end(); |
| } |
| } |