paul-rogers commented on a change in pull request #1500: DRILL-6820: Msgpack format reader URL: https://github.com/apache/drill/pull/1500#discussion_r231001577
########## File path: contrib/format-msgpack/src/main/java/org/apache/drill/exec/store/msgpack/MsgpackSchemaWriter.java ########## @@ -0,0 +1,166 @@ +/* + * 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.store.msgpack; + +import java.io.IOException; +import java.util.Collection; + +import org.apache.drill.common.types.TypeProtos.DataMode; +import org.apache.drill.common.types.TypeProtos.MinorType; +import org.apache.drill.exec.record.MaterializedField; +import org.apache.drill.exec.vector.complex.writer.BaseWriter.ComplexWriter; +import org.apache.drill.exec.vector.complex.writer.BaseWriter.ListWriter; +import org.apache.drill.exec.vector.complex.writer.BaseWriter.MapWriter; + +public class MsgpackSchemaWriter { + + static final org.slf4j.Logger logger = org.slf4j.LoggerFactory.getLogger(MsgpackSchemaWriter.class); + + public MsgpackSchemaWriter() { + } + + public void applySchema(MaterializedField schema, ComplexWriter writer) throws IOException { + writeToMap(schema, writer.rootAsMap()); + } + + private void writeToList(MaterializedField schema, ListWriter listWriter) throws IOException { + if (schema.getType().getMinorType() == MinorType.MAP) { + writeToMap(schema, listWriter.map()); + } else { + Collection<MaterializedField> children = schema.getChildren(); + MaterializedField element = children.iterator().next(); + writeElement(element, null, listWriter, null); + } + } + + private void writeToMap(MaterializedField schema, MapWriter writer) throws IOException { + for (MaterializedField element : schema.getChildren()) { + String name = element.getName(); + writeElement(element, writer, null, name); + } + } + + private void writeElement(MaterializedField schema, MapWriter mapWriter, ListWriter listWriter, String name) + throws IOException { + if (schema.getDataMode() == DataMode.REPEATED) { + writeRepeatedElement(schema, mapWriter, listWriter, name); + } else { + writeSingleElement(schema, mapWriter, listWriter, name); + } + } + + private void writeRepeatedElement(MaterializedField schema, MapWriter mapWriter, ListWriter listWriter, String name) + throws IOException { + if (mapWriter != null) { + writeToList(schema, mapWriter.list(name)); + } else { + writeToList(schema, listWriter.list()); + } + } + + private void writeSingleElement(MaterializedField schema, MapWriter mapWriter, ListWriter listWriter, String name) + throws IOException { + MinorType valueType = schema.getType().getMinorType(); + switch (valueType) { + case BIGINT: + writeInt64(mapWriter, name, listWriter); + break; + case LIST: + if (mapWriter != null) { + writeToList(schema, mapWriter.list(name)); + } else { + writeToList(schema, listWriter.list()); + } + break; + case BIT: + writeBoolean(mapWriter, name, listWriter); + break; + case MAP: + // To handle nested Documents. + if (mapWriter != null) { + writeToMap(schema, mapWriter.map(name)); + } else { + writeToMap(schema, listWriter.map()); + } + break; + case FLOAT8: + writeDouble(mapWriter, name, listWriter); + break; + case TIMESTAMP: + writeTimestamp(mapWriter, name, listWriter); + break; + case VARCHAR: + writeString(mapWriter, name, listWriter); + break; + case VARBINARY: + writeBinary(mapWriter, name, listWriter); + break; + default: + logger.warn("UnSupported messagepack type: " + valueType); + } + } + + private void writeTimestamp(MapWriter mapWriter, String name, ListWriter listWriter) { Review comment: Maybe explain how this works... Not clear where the data resides. ---------------------------------------------------------------- This is an automated message from the Apache Git Service. To respond to the message, please log on GitHub and use the URL above to go to the specific comment. For queries about this service, please contact Infrastructure at: [email protected] With regards, Apache Git Services
