| /* |
| * 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.physical.rowSet; |
| |
| import java.io.IOException; |
| import java.io.OutputStreamWriter; |
| import java.io.Writer; |
| |
| import org.apache.commons.io.output.StringBuilderWriter; |
| import org.apache.drill.common.exceptions.DrillRuntimeException; |
| import org.apache.drill.exec.physical.impl.protocol.BatchAccessor; |
| import org.apache.drill.exec.record.BatchSchema.SelectionVectorMode; |
| import org.apache.drill.exec.record.VectorContainer; |
| import org.apache.drill.exec.record.metadata.TupleMetadata; |
| |
| /** |
| * Helper class to obtain string representation of RowSet. |
| * Example of the output: |
| * <pre> |
| * #: `id` INT NOT NULL, `mapCol` STRUCT<`a` INT, `b` VARCHAR>, `arrayInt` ARRAY<INT> |
| * 0: 1, {20, "say"}, [1, 1, 2] |
| * 1: 2, {20, "hello"}, [] |
| * 2: 2, {20, null}, [3, 5, 8] |
| * </pre> |
| */ |
| public class RowSetFormatter { |
| private final RowSet rowSet; |
| |
| private final Writer writer; |
| |
| public RowSetFormatter(RowSet rowSet, Writer writer) { |
| this.rowSet = rowSet; |
| this.writer = writer; |
| } |
| |
| public static void print(RowSet rowSet) { |
| new RowSetFormatter(rowSet, new OutputStreamWriter(System.out)).write(); |
| } |
| |
| public static void print(VectorContainer container) { |
| RowSets.wrap(container).print(); |
| } |
| |
| public static void print(BatchAccessor batch) { |
| RowSets.wrap(batch).print(); |
| } |
| |
| public static String toString(RowSet rowSet) { |
| StringBuilderWriter out = new StringBuilderWriter(); |
| new RowSetFormatter(rowSet, out).write(); |
| return out.toString(); |
| } |
| |
| public void write() { |
| try { |
| SelectionVectorMode selectionMode = rowSet.indirectionType(); |
| RowSetReader reader = rowSet.reader(); |
| int colCount = reader.tupleSchema().size(); |
| writeSchema(writer, selectionMode, reader); |
| while (reader.next()) { |
| writeHeader(writer, reader, selectionMode); |
| for (int i = 0; i < colCount; i++) { |
| if (i > 0) { |
| writer.write(", "); |
| } |
| writer.write(reader.column(i).getAsString()); |
| } |
| writer.write("\n"); |
| } |
| writer.flush(); |
| } catch (IOException e) { |
| throw new DrillRuntimeException("Error happened when writing rowSet to writer", e); |
| } |
| } |
| |
| private void writeSchema(Writer writer, SelectionVectorMode selectionMode, RowSetReader reader) throws IOException { |
| writer.write("#"); |
| switch (selectionMode) { |
| case FOUR_BYTE: |
| writer.write(" (batch #, row #)"); |
| break; |
| case TWO_BYTE: |
| writer.write(" (row #)"); |
| break; |
| default: |
| break; |
| } |
| writer.write(": "); |
| TupleMetadata schema = reader.tupleSchema(); |
| writeTupleSchema(writer, schema); |
| writer.write("\n"); |
| } |
| |
| private void writeTupleSchema(Writer writer, TupleMetadata schema) throws IOException { |
| for (int i = 0; i < schema.size(); i++) { |
| if (i > 0) { |
| writer.write(", "); |
| } |
| writer.write(schema.metadata(i).columnString()); |
| } |
| } |
| |
| private void writeHeader(Writer writer, RowSetReader reader, SelectionVectorMode selectionMode) throws IOException { |
| writer.write(String.valueOf(reader.logicalIndex())); |
| switch (selectionMode) { |
| case FOUR_BYTE: |
| writer.write(" ("); |
| writer.write(String.valueOf(reader.hyperVectorIndex())); |
| writer.write(", "); |
| writer.write(String.valueOf(reader.offset())); |
| writer.write(")"); |
| break; |
| case TWO_BYTE: |
| writer.write(" ("); |
| writer.write(String.valueOf(reader.offset())); |
| writer.write(")"); |
| break; |
| default: |
| break; |
| } |
| writer.write(": "); |
| } |
| } |