umeshdangat commented on code in PR #3434: URL: https://github.com/apache/flink-cdc/pull/3434#discussion_r1706193946
########## flink-cdc-common/src/main/java/org/apache/flink/cdc/common/data/binary/BinaryArrayData.java: ########## @@ -0,0 +1,574 @@ +/* + * 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.flink.cdc.common.data.binary; + +import org.apache.flink.cdc.common.data.ArrayData; +import org.apache.flink.cdc.common.data.DecimalData; +import org.apache.flink.cdc.common.data.LocalZonedTimestampData; +import org.apache.flink.cdc.common.data.MapData; +import org.apache.flink.cdc.common.data.RecordData; +import org.apache.flink.cdc.common.data.StringData; +import org.apache.flink.cdc.common.data.TimestampData; +import org.apache.flink.cdc.common.data.ZonedTimestampData; +import org.apache.flink.cdc.common.types.DataType; +import org.apache.flink.cdc.common.types.utils.DataTypeUtils; +import org.apache.flink.core.memory.MemorySegment; +import org.apache.flink.core.memory.MemorySegmentFactory; + +import java.lang.reflect.Array; + +import static org.apache.flink.core.memory.MemoryUtils.UNSAFE; + +/** + * A binary implementation of {@link ArrayData} which is backed by {@link MemorySegment}s. + * + * <p>For fields that hold fixed-length primitive types, such as long, double or int, they are + * stored compacted in bytes, just like the original java array. + * + * <p>The binary layout of {@link BinaryArrayData}: + * + * <pre> + * [size(int)] + [null bits(4-byte word boundaries)] + [values or offset&length] + [variable length part]. + * </pre> + */ +public final class BinaryArrayData extends BinarySection implements ArrayData { + + /** Offset for Arrays. */ + private static final int BYTE_ARRAY_BASE_OFFSET = UNSAFE.arrayBaseOffset(byte[].class); + + private static final int BOOLEAN_ARRAY_OFFSET = UNSAFE.arrayBaseOffset(boolean[].class); Review Comment: The reason we maintain different offsets for each primitive type is because our implementation provides methods to convert the binary data into specific primitive type arrays, such as `toShortArray()` and `toIntArray()`. Each primitive type array has a different base offset in memory, which is why we initialize the respective offsets: - SHORT_ARRAY_OFFSET for short[] - INT_ARRAY_OFFSET for int[] - And similarly for other types like boolean, long, float, and double. These offsets are used to accurately copy the binary data into the appropriate primitive type arrays. -- 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]
