[GitHub] [flink] fsk119 commented on a change in pull request #11896: [FLINK-14356] [single-value] Introduce "single-value" format to (de)serialize message to a single field

[GitBox <gi...@apache.org>]

fsk119 commented on a change in pull request #11896:
URL: https://github.com/apache/flink/pull/11896#discussion_r458104873



##########
File path: flink-table/flink-table-runtime-blink/src/main/java/org/apache/flink/table/format/single/SingleValue.java
##########
@@ -0,0 +1,45 @@
+/*
+ * 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.table.format.single;
+
+import org.apache.flink.table.descriptors.DescriptorProperties;
+import org.apache.flink.table.descriptors.FormatDescriptor;
+
+import java.util.Map;
+
+import static org.apache.flink.table.format.single.SingleValueValidator.FORMAT_TYPE_VALUE;

Review comment:
       Please add test for added class.

##########
File path: flink-table/flink-table-runtime-blink/src/main/java/org/apache/flink/table/format/single/SingleValueRowSerializer.java
##########
@@ -0,0 +1,120 @@
+/*
+ * 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.table.format.single;
+
+import org.apache.flink.api.common.serialization.DeserializationSchema;
+import org.apache.flink.api.common.serialization.SerializationSchema;
+import org.apache.flink.api.common.typeinfo.BasicTypeInfo;
+import org.apache.flink.api.common.typeinfo.TypeInformation;
+import org.apache.flink.api.common.typeutils.base.BooleanSerializer;
+import org.apache.flink.api.common.typeutils.base.ByteSerializer;
+import org.apache.flink.api.common.typeutils.base.DoubleSerializer;
+import org.apache.flink.api.common.typeutils.base.FloatSerializer;
+import org.apache.flink.api.common.typeutils.base.IntSerializer;
+import org.apache.flink.api.common.typeutils.base.LongSerializer;
+import org.apache.flink.api.common.typeutils.base.ShortSerializer;
+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.types.logical.LogicalType;
+import org.apache.flink.table.types.logical.LogicalTypeRoot;
+import org.apache.flink.table.types.logical.RowType;
+
+import java.io.IOException;
+
+/**
+ * SingleValueSerializer: deserialize or serialize single value.
+ */
+public class SingleValueRowSerializer implements DeserializationSchema<RowData>,
+	SerializationSchema<RowData> {

Review comment:
       Class name is not suitable if you want to implement two interface together.

##########
File path: flink-table/flink-table-runtime-blink/src/main/java/org/apache/flink/table/format/single/SingleValueValidator.java
##########
@@ -0,0 +1,45 @@
+/*
+ * 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.table.format.single;
+
+import org.apache.flink.table.api.TableSchema;
+import org.apache.flink.table.api.ValidationException;
+import org.apache.flink.table.descriptors.DescriptorProperties;
+import org.apache.flink.table.descriptors.FormatDescriptorValidator;
+import org.apache.flink.table.factories.TableFormatFactoryBase;
+
+/**
+ * Single value format validator.
+ */
+
+public class SingleValueValidator extends FormatDescriptorValidator{
+
+	public static final String FORMAT_TYPE_VALUE = "single-value";
+
+	@Override
+	public void validate(DescriptorProperties properties) {
+		super.validate(properties);
+
+		TableSchema tableSchema = TableFormatFactoryBase.deriveSchema(properties.asMap());
+
+		if (tableSchema.getFieldCount() > 1) {

Review comment:
       Validator works only for Descriptor api. Currently community is prepare to refactor Descriptor api. I think you can leave it as later work.

##########
File path: flink-table/flink-table-runtime-blink/src/main/java/org/apache/flink/table/format/single/SingleValueRowSerializer.java
##########
@@ -0,0 +1,120 @@
+/*
+ * 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.table.format.single;
+
+import org.apache.flink.api.common.serialization.DeserializationSchema;
+import org.apache.flink.api.common.serialization.SerializationSchema;
+import org.apache.flink.api.common.typeinfo.BasicTypeInfo;
+import org.apache.flink.api.common.typeinfo.TypeInformation;
+import org.apache.flink.api.common.typeutils.base.BooleanSerializer;
+import org.apache.flink.api.common.typeutils.base.ByteSerializer;
+import org.apache.flink.api.common.typeutils.base.DoubleSerializer;
+import org.apache.flink.api.common.typeutils.base.FloatSerializer;
+import org.apache.flink.api.common.typeutils.base.IntSerializer;
+import org.apache.flink.api.common.typeutils.base.LongSerializer;
+import org.apache.flink.api.common.typeutils.base.ShortSerializer;
+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.types.logical.LogicalType;
+import org.apache.flink.table.types.logical.LogicalTypeRoot;
+import org.apache.flink.table.types.logical.RowType;
+
+import java.io.IOException;
+
+/**
+ * SingleValueSerializer: deserialize or serialize single value.
+ */
+public class SingleValueRowSerializer implements DeserializationSchema<RowData>,
+	SerializationSchema<RowData> {
+
+	private TypeInformation<RowData> typeInfo;
+	private LogicalType singleValueLogicalType;
+	private SingleValueSerializer singleValueSerializer;
+	private FieldGetter fieldGetter;
+
+	public SingleValueRowSerializer(RowType rowType,
+		TypeInformation<RowData> resultTypeInfo) {
+		this.typeInfo = resultTypeInfo;
+		this.singleValueLogicalType = rowType.getTypeAt(0);
+		this.fieldGetter = RowData.createFieldGetter(singleValueLogicalType, 0);
+		this.singleValueSerializer = initSingleValueSerializer(singleValueLogicalType.getTypeRoot());
+	}
+
+	@Override
+	public RowData deserialize(byte[] message) throws IOException {
+		GenericRowData genericRowData = new GenericRowData(1);
+		genericRowData.setField(0, singleValueSerializer.deserialize(message));
+		return genericRowData;
+	}
+
+	@Override
+	public boolean isEndOfStream(RowData nextElement) {
+		return false;
+	}
+
+	@Override
+	public TypeInformation<RowData> getProducedType() {
+		return typeInfo;
+	}
+
+	@Override
+	public byte[] serialize(RowData element) {
+		return singleValueSerializer.serialize(fieldGetter.getFieldOrNull(element));
+	}
+
+	private SingleValueSerializer initSingleValueSerializer(LogicalTypeRoot typeRoot) {
+		switch (typeRoot) {
+			case CHAR:
+			case VARCHAR:
+				return new StringSingleValueSerializer();
+			case VARBINARY:
+			case BINARY:
+				return new BytesSingleValueSerializer();
+			case TINYINT:
+				return new BasicSingleValueSerializer(ByteSerializer.INSTANCE, BasicTypeInfo.BYTE_TYPE_INFO);
+			case SMALLINT:
+				return new BasicSingleValueSerializer(ShortSerializer.INSTANCE, BasicTypeInfo.SHORT_TYPE_INFO);
+			case INTEGER:
+				return new BasicSingleValueSerializer(IntSerializer.INSTANCE, BasicTypeInfo.INT_TYPE_INFO);
+			case BIGINT:
+				return new BasicSingleValueSerializer(LongSerializer.INSTANCE, BasicTypeInfo.LONG_TYPE_INFO);
+			case FLOAT:
+				return new BasicSingleValueSerializer(FloatSerializer.INSTANCE, BasicTypeInfo.FLOAT_TYPE_INFO);
+			case DOUBLE:
+				return new BasicSingleValueSerializer(DoubleSerializer.INSTANCE, BasicTypeInfo.DOUBLE_TYPE_INFO);
+			case BOOLEAN:
+				return new BasicSingleValueSerializer(BooleanSerializer.INSTANCE, BasicTypeInfo.BOOLEAN_TYPE_INFO);
+			default:
+				throw new RuntimeException("Unsupported single value type:" + singleValueLogicalType.getTypeRoot());
+		}
+	}
+
+	@Override
+	public boolean equals(Object o) {

Review comment:
       Please compare all fields.

##########
File path: flink-table/flink-table-runtime-blink/src/main/java/org/apache/flink/table/format/single/SingleValueFormatFactory.java
##########
@@ -0,0 +1,112 @@
+/*
+ * 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.table.format.single;
+
+import org.apache.flink.api.common.serialization.DeserializationSchema;
+import org.apache.flink.api.common.serialization.SerializationSchema;
+import org.apache.flink.api.common.typeinfo.TypeInformation;
+import org.apache.flink.configuration.ConfigOption;
+import org.apache.flink.configuration.ReadableConfig;
+import org.apache.flink.table.connector.ChangelogMode;
+import org.apache.flink.table.connector.format.DecodingFormat;
+import org.apache.flink.table.connector.format.EncodingFormat;
+import org.apache.flink.table.connector.sink.DynamicTableSink;
+import org.apache.flink.table.connector.source.DynamicTableSource;
+import org.apache.flink.table.data.RowData;
+import org.apache.flink.table.factories.DeserializationFormatFactory;
+import org.apache.flink.table.factories.DynamicTableFactory.Context;
+import org.apache.flink.table.factories.FactoryUtil;
+import org.apache.flink.table.factories.SerializationFormatFactory;
+import org.apache.flink.table.types.DataType;
+import org.apache.flink.table.types.logical.RowType;
+
+import java.util.Collections;
+import java.util.Set;
+
+/**
+ * SingleValueFormatFactory for single value.
+ */
+public class SingleValueFormatFactory implements DeserializationFormatFactory, SerializationFormatFactory {

Review comment:
       Please add @Interanl annotation for all interal public class.

##########
File path: flink-table/flink-table-runtime-blink/src/main/java/org/apache/flink/table/format/single/SingleValueRowSerializer.java
##########
@@ -0,0 +1,120 @@
+/*
+ * 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.table.format.single;
+
+import org.apache.flink.api.common.serialization.DeserializationSchema;
+import org.apache.flink.api.common.serialization.SerializationSchema;
+import org.apache.flink.api.common.typeinfo.BasicTypeInfo;
+import org.apache.flink.api.common.typeinfo.TypeInformation;
+import org.apache.flink.api.common.typeutils.base.BooleanSerializer;
+import org.apache.flink.api.common.typeutils.base.ByteSerializer;
+import org.apache.flink.api.common.typeutils.base.DoubleSerializer;
+import org.apache.flink.api.common.typeutils.base.FloatSerializer;
+import org.apache.flink.api.common.typeutils.base.IntSerializer;
+import org.apache.flink.api.common.typeutils.base.LongSerializer;
+import org.apache.flink.api.common.typeutils.base.ShortSerializer;
+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.types.logical.LogicalType;
+import org.apache.flink.table.types.logical.LogicalTypeRoot;
+import org.apache.flink.table.types.logical.RowType;
+
+import java.io.IOException;
+
+/**
+ * SingleValueSerializer: deserialize or serialize single value.
+ */
+public class SingleValueRowSerializer implements DeserializationSchema<RowData>,
+	SerializationSchema<RowData> {
+
+	private TypeInformation<RowData> typeInfo;
+	private LogicalType singleValueLogicalType;
+	private SingleValueSerializer singleValueSerializer;
+	private FieldGetter fieldGetter;
+
+	public SingleValueRowSerializer(RowType rowType,
+		TypeInformation<RowData> resultTypeInfo) {
+		this.typeInfo = resultTypeInfo;
+		this.singleValueLogicalType = rowType.getTypeAt(0);
+		this.fieldGetter = RowData.createFieldGetter(singleValueLogicalType, 0);
+		this.singleValueSerializer = initSingleValueSerializer(singleValueLogicalType.getTypeRoot());
+	}
+
+	@Override
+	public RowData deserialize(byte[] message) throws IOException {
+		GenericRowData genericRowData = new GenericRowData(1);
+		genericRowData.setField(0, singleValueSerializer.deserialize(message));
+		return genericRowData;
+	}
+
+	@Override
+	public boolean isEndOfStream(RowData nextElement) {
+		return false;
+	}
+
+	@Override
+	public TypeInformation<RowData> getProducedType() {
+		return typeInfo;
+	}
+
+	@Override
+	public byte[] serialize(RowData element) {
+		return singleValueSerializer.serialize(fieldGetter.getFieldOrNull(element));
+	}
+
+	private SingleValueSerializer initSingleValueSerializer(LogicalTypeRoot typeRoot) {
+		switch (typeRoot) {
+			case CHAR:
+			case VARCHAR:

Review comment:
       Considering this serializer only works here, I think it's not suitable to add new public class here, such as `BasicSingleValueSerializer`.  
   You can add a private function interface such as `SerializationRuntimeConverter` and expose `serialize` method. Therefore, you can use lambda function here instead of adding new class. 
   You can take a look at `JsonRowDataSerializationSchema` .

##########
File path: flink-table/flink-table-runtime-blink/src/test/java/org/apache/flink/table/format/single/SingleValueFormatFactoryTest.java
##########
@@ -0,0 +1,103 @@
+/*
+ * 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.table.format.single;
+
+import org.apache.flink.api.common.serialization.DeserializationSchema;
+import org.apache.flink.configuration.Configuration;
+import org.apache.flink.table.api.DataTypes;
+import org.apache.flink.table.api.TableSchema;
+import org.apache.flink.table.catalog.CatalogTableImpl;
+import org.apache.flink.table.catalog.ObjectIdentifier;
+import org.apache.flink.table.connector.sink.DynamicTableSink;
+import org.apache.flink.table.connector.source.DynamicTableSource;
+import org.apache.flink.table.data.RowData;
+import org.apache.flink.table.factories.FactoryUtil;
+import org.apache.flink.table.factories.TestDynamicTableFactory;
+import org.apache.flink.table.runtime.connector.source.ScanRuntimeProviderContext;
+import org.apache.flink.table.runtime.typeutils.RowDataTypeInfo;
+import org.apache.flink.table.types.logical.RowType;
+import org.apache.flink.util.TestLogger;
+
+import org.junit.Test;
+
+import java.util.HashMap;
+import java.util.Map;
+
+import static org.junit.Assert.assertEquals;
+
+/**
+ * Tests for {@link SingleValueFormatFactory}.
+ */
+public class SingleValueFormatFactoryTest extends TestLogger {
+	private static final TableSchema SCHEMA = TableSchema.builder()
+		.field("field1", DataTypes.STRING())
+		.build();
+
+	private static final RowType ROW_TYPE = (RowType) SCHEMA.toRowDataType().getLogicalType();
+
+	@Test
+	public void testSeDeSchema() {

Review comment:
       Please compare actual sink and expected sink.

##########
File path: flink-python/src/test/java/org/apache/flink/table/runtime/typeutils/serializers/python/StringSingleValueSerializerTest.java
##########
@@ -24,7 +24,7 @@
 /**
  * Test for {@link StringSerializer}.
  */
-public class StringSerializerTest extends SerializerTestBase<String> {
+public class StringSingleValueSerializerTest extends SerializerTestBase<String> {

Review comment:
       Why modify here? 
   

##########
File path: flink-table/flink-table-runtime-blink/src/main/java/org/apache/flink/table/format/single/SingleValueValidator.java
##########
@@ -0,0 +1,45 @@
+/*
+ * 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.table.format.single;
+
+import org.apache.flink.table.api.TableSchema;
+import org.apache.flink.table.api.ValidationException;
+import org.apache.flink.table.descriptors.DescriptorProperties;
+import org.apache.flink.table.descriptors.FormatDescriptorValidator;
+import org.apache.flink.table.factories.TableFormatFactoryBase;
+
+/**
+ * Single value format validator.
+ */
+
+public class SingleValueValidator extends FormatDescriptorValidator{
+
+	public static final String FORMAT_TYPE_VALUE = "single-value";
+
+	@Override
+	public void validate(DescriptorProperties properties) {
+		super.validate(properties);
+
+		TableSchema tableSchema = TableFormatFactoryBase.deriveSchema(properties.asMap());
+
+		if (tableSchema.getFieldCount() > 1) {

Review comment:
       I think you can validte schema in SingleValueFormatFactory.

##########
File path: flink-table/flink-table-runtime-blink/src/main/java/org/apache/flink/table/format/single/SingleValueFormatFactory.java
##########
@@ -0,0 +1,112 @@
+/*
+ * 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.table.format.single;
+
+import org.apache.flink.api.common.serialization.DeserializationSchema;
+import org.apache.flink.api.common.serialization.SerializationSchema;
+import org.apache.flink.api.common.typeinfo.TypeInformation;
+import org.apache.flink.configuration.ConfigOption;
+import org.apache.flink.configuration.ReadableConfig;
+import org.apache.flink.table.connector.ChangelogMode;
+import org.apache.flink.table.connector.format.DecodingFormat;
+import org.apache.flink.table.connector.format.EncodingFormat;
+import org.apache.flink.table.connector.sink.DynamicTableSink;
+import org.apache.flink.table.connector.source.DynamicTableSource;
+import org.apache.flink.table.data.RowData;
+import org.apache.flink.table.factories.DeserializationFormatFactory;
+import org.apache.flink.table.factories.DynamicTableFactory.Context;
+import org.apache.flink.table.factories.FactoryUtil;
+import org.apache.flink.table.factories.SerializationFormatFactory;
+import org.apache.flink.table.types.DataType;
+import org.apache.flink.table.types.logical.RowType;
+
+import java.util.Collections;
+import java.util.Set;
+
+/**
+ * SingleValueFormatFactory for single value.
+ */
+public class SingleValueFormatFactory implements DeserializationFormatFactory, SerializationFormatFactory {
+
+	public static final String IDENTIFIER = "single-value";

Review comment:
       String doesn't need final.




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