luoyuxia commented on code in PR #2995: URL: https://github.com/apache/fluss/pull/2995#discussion_r3043798134
########## fluss-common/src/main/java/org/apache/fluss/utils/UnshadedArrowReadUtils.java: ########## @@ -0,0 +1,121 @@ +/* + * 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.fluss.utils; + +import org.apache.fluss.annotation.Internal; +import org.apache.fluss.compression.UnshadedArrowCompressionFactory; +import org.apache.fluss.memory.MemorySegment; +import org.apache.fluss.record.UnshadedFlussVectorLoader; +import org.apache.fluss.types.RowType; + +import org.apache.arrow.memory.BufferAllocator; +import org.apache.arrow.vector.BaseFixedWidthVector; +import org.apache.arrow.vector.BaseVariableWidthVector; +import org.apache.arrow.vector.FieldVector; +import org.apache.arrow.vector.VectorSchemaRoot; +import org.apache.arrow.vector.complex.ListVector; +import org.apache.arrow.vector.ipc.ReadChannel; +import org.apache.arrow.vector.ipc.message.ArrowRecordBatch; +import org.apache.arrow.vector.ipc.message.MessageSerializer; +import org.apache.arrow.vector.types.pojo.Schema; + +import java.io.IOException; +import java.nio.ByteBuffer; + +/** Utilities for loading and projecting Arrow scan batches with unshaded Arrow classes. */ +@Internal +public final class UnshadedArrowReadUtils { + + private UnshadedArrowReadUtils() {} + + public static Schema toArrowSchema(RowType rowType) { + try { + return Schema.fromJSON(ArrowUtils.toArrowSchema(rowType).toJson()); + } catch (IOException e) { + throw new RuntimeException("Failed to convert Arrow schema to unshaded schema.", e); + } + } + + public static void loadArrowBatch( + MemorySegment segment, + int arrowOffset, + int arrowLength, + VectorSchemaRoot schemaRoot, + BufferAllocator allocator) { + ByteBuffer arrowBatchBuffer = segment.wrap(arrowOffset, arrowLength); + try (ReadChannel channel = + new ReadChannel(new ByteBufferReadableChannel(arrowBatchBuffer)); + ArrowRecordBatch batch = + MessageSerializer.deserializeRecordBatch(channel, allocator)) { + new UnshadedFlussVectorLoader(schemaRoot, UnshadedArrowCompressionFactory.INSTANCE) + .load(batch); + } catch (IOException e) { + throw new RuntimeException("Failed to deserialize ArrowRecordBatch.", e); + } + } + + public static VectorSchemaRoot projectVectorSchemaRoot( + VectorSchemaRoot sourceRoot, + RowType targetRowType, + int[] columnProjection, + BufferAllocator allocator) { + int rowCount = sourceRoot.getRowCount(); + Schema targetSchema = toArrowSchema(targetRowType); + VectorSchemaRoot targetRoot = VectorSchemaRoot.create(targetSchema, allocator); + for (int i = 0; i < columnProjection.length; i++) { + FieldVector targetVector = targetRoot.getVector(i); + initFieldVector(targetVector, rowCount); + if (columnProjection[i] < 0) { + fillNullVector(targetVector, rowCount); + } else { + FieldVector sourceVector = sourceRoot.getVector(columnProjection[i]); + for (int rowId = 0; rowId < rowCount; rowId++) { + targetVector.copyFromSafe(rowId, rowId, sourceVector); + } + targetVector.setValueCount(rowCount); + } Review Comment: Consider it's not a hot path. -- This is an automated message from the Apache Git Service. To respond to the message, please log on to GitHub and use the URL above to go to the specific comment. To unsubscribe, e-mail: [email protected] For queries about this service, please contact Infrastructure at: [email protected]
