yunqingmoswu commented on code in PR #7878:
URL: https://github.com/apache/inlong/pull/7878#discussion_r1181442076


##########
inlong-sort/sort-connectors/iceberg/src/main/java/org/apache/inlong/sort/iceberg/sink/collections/PartitionGroupBuffer.java:
##########
@@ -0,0 +1,364 @@
+/*
+ * 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.inlong.sort.iceberg.sink.collections;
+
+import org.apache.flink.api.common.ExecutionConfig;
+import org.apache.flink.api.common.typeinfo.BasicTypeInfo;
+import org.apache.flink.api.common.typeinfo.TypeInformation;
+import org.apache.flink.api.common.typeutils.TypeSerializer;
+import org.apache.flink.api.common.typeutils.base.StringSerializer;
+import org.apache.flink.api.java.tuple.Tuple2;
+import org.apache.flink.api.java.typeutils.TupleTypeInfo;
+import org.apache.flink.core.memory.DataInputDeserializer;
+import org.apache.flink.core.memory.DataOutputSerializer;
+import org.apache.flink.shaded.guava18.com.google.common.base.Preconditions;
+import org.apache.flink.table.data.GenericRowData;
+import org.apache.flink.table.data.RowData;
+import org.apache.flink.table.data.RowData.FieldGetter;
+import org.apache.flink.table.data.util.RowDataUtil;
+import org.apache.flink.table.runtime.operators.sort.SortUtil;
+import org.apache.flink.table.runtime.typeutils.InternalTypeInfo;
+import org.apache.iceberg.PartitionKey;
+import org.apache.iceberg.Schema;
+import org.apache.iceberg.flink.FlinkSchemaUtil;
+import org.apache.iceberg.flink.RowDataWrapper;
+import org.apache.iceberg.types.Types.NestedField;
+
+import java.io.Closeable;
+import java.io.File;
+import java.io.IOException;
+import java.io.Serializable;
+import java.util.Arrays;
+import java.util.Comparator;
+import java.util.HashSet;
+import java.util.Objects;
+import java.util.Set;
+import java.util.concurrent.atomic.AtomicLong;
+import java.util.function.Consumer;
+import java.util.stream.Collectors;
+import java.util.stream.Stream;
+
+public abstract class PartitionGroupBuffer implements Serializable {

Review Comment:
   Please add some comments for it.



##########
inlong-sort/sort-connectors/iceberg/src/main/java/org/apache/inlong/sort/iceberg/sink/collections/PartitionGroupBuffer.java:
##########
@@ -0,0 +1,364 @@
+/*
+ * 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.inlong.sort.iceberg.sink.collections;
+
+import org.apache.flink.api.common.ExecutionConfig;
+import org.apache.flink.api.common.typeinfo.BasicTypeInfo;
+import org.apache.flink.api.common.typeinfo.TypeInformation;
+import org.apache.flink.api.common.typeutils.TypeSerializer;
+import org.apache.flink.api.common.typeutils.base.StringSerializer;
+import org.apache.flink.api.java.tuple.Tuple2;
+import org.apache.flink.api.java.typeutils.TupleTypeInfo;
+import org.apache.flink.core.memory.DataInputDeserializer;
+import org.apache.flink.core.memory.DataOutputSerializer;
+import org.apache.flink.shaded.guava18.com.google.common.base.Preconditions;
+import org.apache.flink.table.data.GenericRowData;
+import org.apache.flink.table.data.RowData;
+import org.apache.flink.table.data.RowData.FieldGetter;
+import org.apache.flink.table.data.util.RowDataUtil;
+import org.apache.flink.table.runtime.operators.sort.SortUtil;
+import org.apache.flink.table.runtime.typeutils.InternalTypeInfo;
+import org.apache.iceberg.PartitionKey;
+import org.apache.iceberg.Schema;
+import org.apache.iceberg.flink.FlinkSchemaUtil;
+import org.apache.iceberg.flink.RowDataWrapper;
+import org.apache.iceberg.types.Types.NestedField;
+
+import java.io.Closeable;
+import java.io.File;
+import java.io.IOException;
+import java.io.Serializable;
+import java.util.Arrays;
+import java.util.Comparator;
+import java.util.HashSet;
+import java.util.Objects;
+import java.util.Set;
+import java.util.concurrent.atomic.AtomicLong;
+import java.util.function.Consumer;
+import java.util.stream.Collectors;
+import java.util.stream.Stream;
+
+public abstract class PartitionGroupBuffer implements Serializable {
+
+    private static final long serialVersionUID = 1L;
+    protected final KVBuffer<?, RowData> buffer;
+    protected final PartitionKey partitionKey; // partition key helper
+    protected final Schema rowSchema; // the whole field schema
+    protected final Set<String> allPartition;
+    private transient RowDataWrapper wrapper;
+
+    private PartitionGroupBuffer(
+            KVBuffer<?, RowData> buffer,
+            PartitionKey partitionKey,
+            Schema rowSchema) {
+        this.buffer = buffer;
+        this.partitionKey = partitionKey;
+        this.rowSchema = rowSchema;
+        this.allPartition = new HashSet<>();
+    }
+
+    public abstract RowData add(RowData row);
+
+    public void scanPartitions(Consumer<Tuple2<?, RowData>> consumer) throws 
IOException {
+        DataOutputSerializer outputBuffer = new DataOutputSerializer(4096);
+        for (String partition : allPartition) {
+            StringSerializer.INSTANCE.serialize(partition, outputBuffer);
+            try (Stream<? extends Tuple2<?, RowData>> stream = 
buffer.scan(outputBuffer.getCopyOfBuffer())) {
+                stream.forEach(consumer);
+            }
+            outputBuffer.clear();
+        }
+    }
+
+    public void close() throws IOException {
+        if (buffer instanceof Closeable) {
+            ((Closeable) buffer).close();
+        }
+    }
+
+    public void clear() {
+        buffer.clear();
+        allPartition.clear();
+    }
+
+    protected RowDataWrapper lazyRowDataWrapper() {
+        if (wrapper == null) {
+            wrapper = new RowDataWrapper(FlinkSchemaUtil.convert(rowSchema), 
rowSchema.asStruct());
+        }
+        return wrapper;
+    }
+
+    /**
+     * Initialize {@link PreAggPartitionGroupBuffer}
+     *
+     * @param fieldsGetter function to get object from {@link RowData}
+     * @param deleteSchema equality fields schema
+     * @param rowSchema row data schema
+     * @param partitionKey partition key
+     * @param type buffer type to store buffer data
+     */
+    public static PreAggPartitionGroupBuffer preAggInstance(
+            FieldGetter[] fieldsGetter,
+            Schema deleteSchema,
+            Schema rowSchema,
+            PartitionKey partitionKey,
+            BufferType type) {
+        // note: here because `NestedField` does not override equals function, 
so can not indexOf by `NestedField`
+        int[] equalityFieldIndex = deleteSchema.columns().stream()
+                .map(field -> rowSchema.columns()
+                        .stream()
+                        .map(NestedField::fieldId)
+                        .collect(Collectors.toList())
+                        .indexOf(field.fieldId()))
+                .sorted()
+                .mapToInt(Integer::valueOf)
+                .toArray();
+        // do some check, check whether index is legal. can not be null and 
unique, and number in fields range.
+        Preconditions.checkArgument(
+                Arrays.stream(equalityFieldIndex)
+                        .allMatch(index -> index >= 0 && index < 
fieldsGetter.length),
+                String.format("Any equality field index (%s) should in a legal 
range.",
+                        Arrays.toString(equalityFieldIndex)));
+
+        KVBuffer<Tuple2<String, RowData>, RowData> buffer = null;
+        if (BufferType.ROCKSDB.equals(type)) {
+            TypeInformation<Tuple2<String, RowData>> keyTypeInfo = new 
TupleTypeInfo(
+                    BasicTypeInfo.STRING_TYPE_INFO,
+                    
InternalTypeInfo.of(FlinkSchemaUtil.convert(deleteSchema)));
+            TypeInformation<RowData> valueTypeInfo = 
InternalTypeInfo.of(FlinkSchemaUtil.convert(rowSchema));
+            buffer = new RocksDBKVBuffer<>(
+                    keyTypeInfo.createSerializer(new ExecutionConfig()),
+                    valueTypeInfo.createSerializer(new ExecutionConfig()),
+                    System.getProperty("java.io.tmpdir") + File.separator + 
"mini_batch");
+        } else {
+            TypeInformation<RowData> keyTypeInfo = 
InternalTypeInfo.of(FlinkSchemaUtil.convert(deleteSchema));
+            buffer = new SortedHeapKVBuffer<>(
+                    new 
PreAggPartitionConvertor(keyTypeInfo.createSerializer(new ExecutionConfig())));
+        }
+        return new PreAggPartitionGroupBuffer(buffer, partitionKey, rowSchema, 
fieldsGetter, equalityFieldIndex);
+    }
+
+    /**
+     * Initialize {@link NonPreAggPartitionGroupBuffer}
+     *
+     * @param rowSchema row data schema
+     * @param partitionKey partition key
+     */
+    public static NonPreAggPartitionGroupBuffer nonPreAggInstance(
+            Schema rowSchema,
+            PartitionKey partitionKey,
+            BufferType type) {
+        TypeInformation<Tuple2<String, Long>> keyTypeInfo = new TupleTypeInfo(
+                BasicTypeInfo.STRING_TYPE_INFO,
+                BasicTypeInfo.LONG_TYPE_INFO);
+        TypeInformation<RowData> valueTypeInfo = 
InternalTypeInfo.of(FlinkSchemaUtil.convert(rowSchema));
+
+        KVBuffer<Tuple2<String, Long>, RowData> buffer = null;
+        if (BufferType.ROCKSDB.equals(type)) {
+            buffer = new RocksDBKVBuffer<>(
+                    keyTypeInfo.createSerializer(new ExecutionConfig()),
+                    valueTypeInfo.createSerializer(new ExecutionConfig()),
+                    System.getProperty("java.io.tmpdir") + "/mini_batch");
+        } else {
+            buffer = new SortedHeapKVBuffer<>(new 
NonPreAggPartitionConvetor());
+        }
+        return new NonPreAggPartitionGroupBuffer(buffer, partitionKey, 
rowSchema);
+    }
+
+    // The key is Tuple<partition path, primary key value>
+    public static class PreAggPartitionGroupBuffer extends 
PartitionGroupBuffer {
+
+        private final int[] equalityFieldIndex; // the position ordered of 
equality field in row schema
+        private final FieldGetter[] fieldsGetter;
+
+        private PreAggPartitionGroupBuffer(
+                KVBuffer<Tuple2<String, RowData>, RowData> buffer,
+                PartitionKey partitionKey,
+                Schema rowSchema,
+                FieldGetter[] fieldsGetter,
+                int[] equalityFieldIndex) {
+            super(buffer, partitionKey, rowSchema);
+            this.fieldsGetter = fieldsGetter;
+            this.equalityFieldIndex = equalityFieldIndex;
+
+        }
+
+        @Override
+        public RowData add(RowData row) {
+            RowData primaryKey = 
GenericRowData.of(Arrays.stream(equalityFieldIndex)
+                    .boxed()
+                    .map(index -> fieldsGetter[index].getFieldOrNull(row))
+                    .toArray(Object[]::new));
+            partitionKey.partition(lazyRowDataWrapper().wrap(row));
+            allPartition.add(partitionKey.toPath());
+
+            if (RowDataUtil.isAccumulateMsg(row)) {
+                return ((KVBuffer<Tuple2<String, RowData>, RowData>) 
buffer).put(
+                        new Tuple2<>(partitionKey.toPath(), primaryKey), row);
+            } else {
+                return ((KVBuffer<Tuple2<String, RowData>, RowData>) 
buffer).remove(
+                        new Tuple2<>(partitionKey.toPath(), primaryKey));
+            }
+        }
+    }
+
+    // The key is Tuple<partition path, an incremental number>
+    public static class NonPreAggPartitionGroupBuffer extends 
PartitionGroupBuffer {
+
+        private final AtomicLong number;
+
+        private NonPreAggPartitionGroupBuffer(
+                KVBuffer<Tuple2<String, Long>, RowData> buffer,
+                PartitionKey partitionKey,
+                Schema rowSchema) {
+            super(buffer, partitionKey, rowSchema);
+            this.number = new AtomicLong(0L);
+        }
+
+        @Override
+        public RowData add(RowData row) {
+            partitionKey.partition(lazyRowDataWrapper().wrap(row));
+            allPartition.add(partitionKey.toPath());
+
+            return ((KVBuffer<Tuple2<String, Long>, RowData>) buffer).put(
+                    new Tuple2<>(partitionKey.toPath(), 
number.incrementAndGet()), row);
+        }
+
+        @Override
+        public void clear() {
+            super.clear();
+            number.set(0L);
+        }
+    }
+
+    public static class PreAggPartitionConvertor implements 
KVBuffer.Convertor<Tuple2<String, RowData>>, Serializable {
+
+        private static final long serialVersionUID = 1L;
+        private static final GenericRowData EMPTY_ROW = GenericRowData.of();
+
+        private final TypeSerializer<RowData> keySerializer;
+        private final DataOutputSerializer outputBuffer;
+        private final DataInputDeserializer inputBuffer;
+
+        public PreAggPartitionConvertor(TypeSerializer<RowData> keySerializer) 
{
+            this.keySerializer = keySerializer;
+            this.outputBuffer = new DataOutputSerializer(4096);
+            this.inputBuffer = new DataInputDeserializer();
+        }
+
+        // note: Please do not put it into storage location, it's just for 
compare
+        @Override
+        public Tuple2<String, RowData> upper(byte[] keyPrefix) {
+            inputBuffer.setBuffer(keyPrefix);
+            try {
+                return new 
Tuple2<>(StringSerializer.INSTANCE.deserialize(inputBuffer), 
GenericRowData.of());
+            } catch (IOException e) {
+                throw new RuntimeException(e);
+            }
+        }
+
+        // note: Please do not put it into storage location, it's just for 
compare
+        @Override
+        public Tuple2<String, RowData> lower(byte[] keyPrefix) {
+            inputBuffer.setBuffer(keyPrefix);
+            try {
+                return new 
Tuple2<>(StringSerializer.INSTANCE.deserialize(inputBuffer), null);
+            } catch (IOException e) {
+                throw new RuntimeException(e);
+            }
+        }
+
+        @Override
+        public int compare(Tuple2<String, RowData> k1, Tuple2<String, RowData> 
k2) {
+            if (!Objects.equals(k1.f0, k2.f0)) {
+                return 
Comparator.nullsLast(Comparator.comparing((Tuple2<String, RowData> k) -> 
k.f0)).compare(k1, k2);
+            }
+
+            if (k1.f1 == null || k2.f1 == null) {
+                if (Objects.equals(k1.f1, k2.f1)) {
+                    return 0;
+                } else if (k1.f1 == null) {
+                    return -1;
+                } else {
+                    return 1;
+                }
+            }
+
+            if (EMPTY_ROW.equals(k1.f1) || EMPTY_ROW.equals(k2.f1)) {
+                if (Objects.equals(k1.f1, k2.f1)) {
+                    return 0;
+                } else if (EMPTY_ROW.equals(k1.f1)) {
+                    return 1;
+                } else {
+                    return -1;
+                }
+            }
+
+            try {
+                keySerializer.serialize(k1.f1, outputBuffer);
+                byte[] b1 = outputBuffer.getCopyOfBuffer();
+                outputBuffer.clear();
+                keySerializer.serialize(k2.f1, outputBuffer);
+                byte[] b2 = outputBuffer.getCopyOfBuffer();
+                outputBuffer.clear();
+                return SortUtil.compareBinary(b1, b2);
+            } catch (IOException e) {
+                throw new RuntimeException(e);
+            }
+        }
+    }
+
+    public static class NonPreAggPartitionConvetor implements 
KVBuffer.Convertor<Tuple2<String, Long>>, Serializable {

Review Comment:
   Please add some comments for it.



##########
inlong-sort/sort-connectors/iceberg/src/main/java/org/apache/inlong/sort/iceberg/sink/collections/PartitionGroupBuffer.java:
##########
@@ -0,0 +1,364 @@
+/*
+ * 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.inlong.sort.iceberg.sink.collections;
+
+import org.apache.flink.api.common.ExecutionConfig;
+import org.apache.flink.api.common.typeinfo.BasicTypeInfo;
+import org.apache.flink.api.common.typeinfo.TypeInformation;
+import org.apache.flink.api.common.typeutils.TypeSerializer;
+import org.apache.flink.api.common.typeutils.base.StringSerializer;
+import org.apache.flink.api.java.tuple.Tuple2;
+import org.apache.flink.api.java.typeutils.TupleTypeInfo;
+import org.apache.flink.core.memory.DataInputDeserializer;
+import org.apache.flink.core.memory.DataOutputSerializer;
+import org.apache.flink.shaded.guava18.com.google.common.base.Preconditions;
+import org.apache.flink.table.data.GenericRowData;
+import org.apache.flink.table.data.RowData;
+import org.apache.flink.table.data.RowData.FieldGetter;
+import org.apache.flink.table.data.util.RowDataUtil;
+import org.apache.flink.table.runtime.operators.sort.SortUtil;
+import org.apache.flink.table.runtime.typeutils.InternalTypeInfo;
+import org.apache.iceberg.PartitionKey;
+import org.apache.iceberg.Schema;
+import org.apache.iceberg.flink.FlinkSchemaUtil;
+import org.apache.iceberg.flink.RowDataWrapper;
+import org.apache.iceberg.types.Types.NestedField;
+
+import java.io.Closeable;
+import java.io.File;
+import java.io.IOException;
+import java.io.Serializable;
+import java.util.Arrays;
+import java.util.Comparator;
+import java.util.HashSet;
+import java.util.Objects;
+import java.util.Set;
+import java.util.concurrent.atomic.AtomicLong;
+import java.util.function.Consumer;
+import java.util.stream.Collectors;
+import java.util.stream.Stream;
+
+public abstract class PartitionGroupBuffer implements Serializable {
+
+    private static final long serialVersionUID = 1L;
+    protected final KVBuffer<?, RowData> buffer;
+    protected final PartitionKey partitionKey; // partition key helper
+    protected final Schema rowSchema; // the whole field schema
+    protected final Set<String> allPartition;
+    private transient RowDataWrapper wrapper;
+
+    private PartitionGroupBuffer(
+            KVBuffer<?, RowData> buffer,
+            PartitionKey partitionKey,
+            Schema rowSchema) {
+        this.buffer = buffer;
+        this.partitionKey = partitionKey;
+        this.rowSchema = rowSchema;
+        this.allPartition = new HashSet<>();
+    }
+
+    public abstract RowData add(RowData row);
+
+    public void scanPartitions(Consumer<Tuple2<?, RowData>> consumer) throws 
IOException {
+        DataOutputSerializer outputBuffer = new DataOutputSerializer(4096);
+        for (String partition : allPartition) {
+            StringSerializer.INSTANCE.serialize(partition, outputBuffer);
+            try (Stream<? extends Tuple2<?, RowData>> stream = 
buffer.scan(outputBuffer.getCopyOfBuffer())) {
+                stream.forEach(consumer);
+            }
+            outputBuffer.clear();
+        }
+    }
+
+    public void close() throws IOException {
+        if (buffer instanceof Closeable) {
+            ((Closeable) buffer).close();
+        }
+    }
+
+    public void clear() {
+        buffer.clear();
+        allPartition.clear();
+    }
+
+    protected RowDataWrapper lazyRowDataWrapper() {
+        if (wrapper == null) {
+            wrapper = new RowDataWrapper(FlinkSchemaUtil.convert(rowSchema), 
rowSchema.asStruct());
+        }
+        return wrapper;
+    }
+
+    /**
+     * Initialize {@link PreAggPartitionGroupBuffer}
+     *
+     * @param fieldsGetter function to get object from {@link RowData}
+     * @param deleteSchema equality fields schema
+     * @param rowSchema row data schema
+     * @param partitionKey partition key
+     * @param type buffer type to store buffer data
+     */
+    public static PreAggPartitionGroupBuffer preAggInstance(
+            FieldGetter[] fieldsGetter,
+            Schema deleteSchema,
+            Schema rowSchema,
+            PartitionKey partitionKey,
+            BufferType type) {
+        // note: here because `NestedField` does not override equals function, 
so can not indexOf by `NestedField`
+        int[] equalityFieldIndex = deleteSchema.columns().stream()
+                .map(field -> rowSchema.columns()
+                        .stream()
+                        .map(NestedField::fieldId)
+                        .collect(Collectors.toList())
+                        .indexOf(field.fieldId()))
+                .sorted()
+                .mapToInt(Integer::valueOf)
+                .toArray();
+        // do some check, check whether index is legal. can not be null and 
unique, and number in fields range.
+        Preconditions.checkArgument(
+                Arrays.stream(equalityFieldIndex)
+                        .allMatch(index -> index >= 0 && index < 
fieldsGetter.length),
+                String.format("Any equality field index (%s) should in a legal 
range.",
+                        Arrays.toString(equalityFieldIndex)));
+
+        KVBuffer<Tuple2<String, RowData>, RowData> buffer = null;
+        if (BufferType.ROCKSDB.equals(type)) {
+            TypeInformation<Tuple2<String, RowData>> keyTypeInfo = new 
TupleTypeInfo(
+                    BasicTypeInfo.STRING_TYPE_INFO,
+                    
InternalTypeInfo.of(FlinkSchemaUtil.convert(deleteSchema)));
+            TypeInformation<RowData> valueTypeInfo = 
InternalTypeInfo.of(FlinkSchemaUtil.convert(rowSchema));
+            buffer = new RocksDBKVBuffer<>(
+                    keyTypeInfo.createSerializer(new ExecutionConfig()),
+                    valueTypeInfo.createSerializer(new ExecutionConfig()),
+                    System.getProperty("java.io.tmpdir") + File.separator + 
"mini_batch");
+        } else {
+            TypeInformation<RowData> keyTypeInfo = 
InternalTypeInfo.of(FlinkSchemaUtil.convert(deleteSchema));
+            buffer = new SortedHeapKVBuffer<>(
+                    new 
PreAggPartitionConvertor(keyTypeInfo.createSerializer(new ExecutionConfig())));
+        }
+        return new PreAggPartitionGroupBuffer(buffer, partitionKey, rowSchema, 
fieldsGetter, equalityFieldIndex);
+    }
+
+    /**
+     * Initialize {@link NonPreAggPartitionGroupBuffer}
+     *
+     * @param rowSchema row data schema
+     * @param partitionKey partition key
+     */
+    public static NonPreAggPartitionGroupBuffer nonPreAggInstance(
+            Schema rowSchema,
+            PartitionKey partitionKey,
+            BufferType type) {
+        TypeInformation<Tuple2<String, Long>> keyTypeInfo = new TupleTypeInfo(
+                BasicTypeInfo.STRING_TYPE_INFO,
+                BasicTypeInfo.LONG_TYPE_INFO);
+        TypeInformation<RowData> valueTypeInfo = 
InternalTypeInfo.of(FlinkSchemaUtil.convert(rowSchema));
+
+        KVBuffer<Tuple2<String, Long>, RowData> buffer = null;
+        if (BufferType.ROCKSDB.equals(type)) {
+            buffer = new RocksDBKVBuffer<>(
+                    keyTypeInfo.createSerializer(new ExecutionConfig()),
+                    valueTypeInfo.createSerializer(new ExecutionConfig()),
+                    System.getProperty("java.io.tmpdir") + "/mini_batch");
+        } else {
+            buffer = new SortedHeapKVBuffer<>(new 
NonPreAggPartitionConvetor());
+        }
+        return new NonPreAggPartitionGroupBuffer(buffer, partitionKey, 
rowSchema);
+    }
+
+    // The key is Tuple<partition path, primary key value>
+    public static class PreAggPartitionGroupBuffer extends 
PartitionGroupBuffer {
+
+        private final int[] equalityFieldIndex; // the position ordered of 
equality field in row schema
+        private final FieldGetter[] fieldsGetter;
+
+        private PreAggPartitionGroupBuffer(
+                KVBuffer<Tuple2<String, RowData>, RowData> buffer,
+                PartitionKey partitionKey,
+                Schema rowSchema,
+                FieldGetter[] fieldsGetter,
+                int[] equalityFieldIndex) {
+            super(buffer, partitionKey, rowSchema);
+            this.fieldsGetter = fieldsGetter;
+            this.equalityFieldIndex = equalityFieldIndex;
+
+        }
+
+        @Override
+        public RowData add(RowData row) {
+            RowData primaryKey = 
GenericRowData.of(Arrays.stream(equalityFieldIndex)
+                    .boxed()
+                    .map(index -> fieldsGetter[index].getFieldOrNull(row))
+                    .toArray(Object[]::new));
+            partitionKey.partition(lazyRowDataWrapper().wrap(row));
+            allPartition.add(partitionKey.toPath());
+
+            if (RowDataUtil.isAccumulateMsg(row)) {
+                return ((KVBuffer<Tuple2<String, RowData>, RowData>) 
buffer).put(
+                        new Tuple2<>(partitionKey.toPath(), primaryKey), row);
+            } else {
+                return ((KVBuffer<Tuple2<String, RowData>, RowData>) 
buffer).remove(
+                        new Tuple2<>(partitionKey.toPath(), primaryKey));
+            }
+        }
+    }
+
+    // The key is Tuple<partition path, an incremental number>
+    public static class NonPreAggPartitionGroupBuffer extends 
PartitionGroupBuffer {
+
+        private final AtomicLong number;
+
+        private NonPreAggPartitionGroupBuffer(
+                KVBuffer<Tuple2<String, Long>, RowData> buffer,
+                PartitionKey partitionKey,
+                Schema rowSchema) {
+            super(buffer, partitionKey, rowSchema);
+            this.number = new AtomicLong(0L);
+        }
+
+        @Override
+        public RowData add(RowData row) {
+            partitionKey.partition(lazyRowDataWrapper().wrap(row));
+            allPartition.add(partitionKey.toPath());
+
+            return ((KVBuffer<Tuple2<String, Long>, RowData>) buffer).put(
+                    new Tuple2<>(partitionKey.toPath(), 
number.incrementAndGet()), row);
+        }
+
+        @Override
+        public void clear() {
+            super.clear();
+            number.set(0L);
+        }
+    }
+
+    public static class PreAggPartitionConvertor implements 
KVBuffer.Convertor<Tuple2<String, RowData>>, Serializable {

Review Comment:
   Please add some comments for it.



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