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90 changes: 90 additions & 0 deletions
90
...ntation/paimon-python-java-bridge/src/main/java/org/apache/paimon/python/BytesReader.java
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| /* | ||
| * 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. | ||
| */ | ||
|
|
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| package org.apache.paimon.python; | ||
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| import org.apache.paimon.arrow.ArrowUtils; | ||
| import org.apache.paimon.arrow.vector.ArrowFormatWriter; | ||
| import org.apache.paimon.data.InternalRow; | ||
| import org.apache.paimon.reader.RecordReader; | ||
| import org.apache.paimon.reader.RecordReaderIterator; | ||
| import org.apache.paimon.table.source.Split; | ||
| import org.apache.paimon.table.source.TableRead; | ||
| import org.apache.paimon.types.RowType; | ||
|
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| import org.apache.arrow.vector.VectorSchemaRoot; | ||
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| import javax.annotation.Nullable; | ||
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| import java.io.ByteArrayOutputStream; | ||
| import java.io.IOException; | ||
|
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| /** Read Arrow bytes from split. */ | ||
| public class BytesReader { | ||
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| private static final int DEFAULT_WRITE_BATCH_SIZE = 2048; | ||
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| private final TableRead tableRead; | ||
| private final ArrowFormatWriter arrowFormatWriter; | ||
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| private RecordReaderIterator<InternalRow> iterator; | ||
| private InternalRow nextRow; | ||
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| public BytesReader(TableRead tableRead, RowType rowType) { | ||
| this.tableRead = tableRead; | ||
| this.arrowFormatWriter = new ArrowFormatWriter(rowType, DEFAULT_WRITE_BATCH_SIZE); | ||
| } | ||
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| public void setSplit(Split split) throws IOException { | ||
| RecordReader<InternalRow> recordReader = tableRead.createReader(split); | ||
| iterator = new RecordReaderIterator<InternalRow>(recordReader); | ||
| nextRow(); | ||
| } | ||
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| @Nullable | ||
| public byte[] next() throws Exception { | ||
| if (nextRow == null) { | ||
| return null; | ||
| } | ||
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| int rowCount = 0; | ||
| while (nextRow != null && arrowFormatWriter.write(nextRow)) { | ||
| nextRow(); | ||
| rowCount++; | ||
| } | ||
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| VectorSchemaRoot vsr = arrowFormatWriter.getVectorSchemaRoot(); | ||
| vsr.setRowCount(rowCount); | ||
| ByteArrayOutputStream out = new ByteArrayOutputStream(); | ||
| ArrowUtils.serializeToIpc(vsr, out); | ||
| if (nextRow == null) { | ||
| // close resource | ||
| arrowFormatWriter.close(); | ||
| iterator.close(); | ||
| } | ||
| return out.toByteArray(); | ||
| } | ||
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| private void nextRow() { | ||
| if (iterator.hasNext()) { | ||
| nextRow = iterator.next(); | ||
| } else { | ||
| nextRow = null; | ||
| } | ||
| } | ||
| } |
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