[Fix][Connector-V2] Fix cdc use default value when value is null

seatunnel-connectors-v2/connector-cdc/connector-cdc-base/src/main/java/org/apache/seatunnel/connectors/cdc/debezium/row/SeaTunnelRowDebeziumDeserializationConverters.java

@@ -85,7 +85,7 @@ public SeaTunnelRow convert(SourceRecord record, Struct struct, Schema schema)
             if (field == null) {
                 row.setField(i, null);
             } else {
-                Object fieldValue = struct.get(fieldName);
+                Object fieldValue = struct.getWithoutDefault(fieldName);
                 Schema fieldSchema = field.schema();
                 Object convertedField =
                         SeaTunnelRowDebeziumDeserializationConverters.convertField(
@@ -494,11 +494,11 @@ public Object convert(Object dbzObj, Schema schema) throws Exception {
                 SeaTunnelRow row = new SeaTunnelRow(arity);
                 for (int i = 0; i < arity; i++) {
                     String fieldName = fieldNames[i];
-                    Object fieldValue = struct.get(fieldName);
                     Field field = schema.field(fieldName);
                     if (field == null) {
                         row.setField(i, null);
                     } else {
+                        Object fieldValue = struct.getWithoutDefault(fieldName);
                         Schema fieldSchema = field.schema();
                         Object convertedField =
                                 SeaTunnelRowDebeziumDeserializationConverters.convertField(

seatunnel-connectors-v2/connector-cdc/connector-cdc-base/src/test/java/org/apache/seatunnel/connectors/cdc/debezium/row/SeaTunnelRowDebeziumDeserializationConvertersTest.java

@@ -0,0 +1,78 @@
+/*
+ * 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.seatunnel.connectors.cdc.debezium.row;
+
+import org.apache.seatunnel.api.table.type.BasicType;
+import org.apache.seatunnel.api.table.type.SeaTunnelDataType;
+import org.apache.seatunnel.api.table.type.SeaTunnelRow;
+import org.apache.seatunnel.api.table.type.SeaTunnelRowType;
+import org.apache.seatunnel.connectors.cdc.debezium.DebeziumDeserializationConverterFactory;
+import org.apache.seatunnel.connectors.cdc.debezium.MetadataConverter;
+
+import org.apache.kafka.connect.data.Schema;
+import org.apache.kafka.connect.data.SchemaBuilder;
+import org.apache.kafka.connect.data.Struct;
+import org.apache.kafka.connect.source.SourceRecord;
+
+import org.junit.jupiter.api.Assertions;
+import org.junit.jupiter.api.Test;
+
+import java.time.ZoneId;
+import java.util.ArrayList;
+import java.util.HashMap;
+
+public class SeaTunnelRowDebeziumDeserializationConvertersTest {
+
+    @Test
+    void testDefaultValueNotUsed() throws Exception {
+        SeaTunnelRowDebeziumDeserializationConverters converters =
+                new SeaTunnelRowDebeziumDeserializationConverters(
+                        new SeaTunnelRowType(
+                                new String[] {"id", "name"},
+                                new SeaTunnelDataType[] {
+                                    BasicType.INT_TYPE, BasicType.STRING_TYPE
+                                }),
+                        new MetadataConverter[] {},
+                        ZoneId.systemDefault(),
+                        DebeziumDeserializationConverterFactory.DEFAULT);
+        Schema schema =
+                SchemaBuilder.struct()
+                        .field("id", SchemaBuilder.int32().build())
+                        .field("name", SchemaBuilder.string().defaultValue("UL"))
+                        .build();
+        Struct value = new Struct(schema);
+        // the value of `name` is null, so do not put value for it
+        value.put("id", 1);
+        SourceRecord record =
+                new SourceRecord(
+                        new HashMap<>(),
+                        new HashMap<>(),
+                        "topicName",
+                        null,
+                        SchemaBuilder.int32().build(),
+                        1,
+                        schema,
+                        value,
+                        null,
+                        new ArrayList<>());
+
+        SeaTunnelRow row = converters.convert(record, value, schema);
+        Assertions.assertEquals(row.getField(0), 1);
+        Assertions.assertNull(row.getField(1));
+    }
+}

seatunnel-connectors-v2/connector-prometheus/src/main/java/org/apache/seatunnel/connectors/seatunnel/prometheus/sink/PrometheusSink.java

@@ -19,24 +19,25 @@
 import org.apache.seatunnel.api.configuration.ReadonlyConfig;
 import org.apache.seatunnel.api.sink.SinkWriter;
 import org.apache.seatunnel.api.sink.SupportMultiTableSink;
+import org.apache.seatunnel.api.table.catalog.CatalogTable;
 import org.apache.seatunnel.api.table.type.SeaTunnelRow;
-import org.apache.seatunnel.api.table.type.SeaTunnelRowType;
 import org.apache.seatunnel.connectors.seatunnel.common.sink.AbstractSimpleSink;
 import org.apache.seatunnel.connectors.seatunnel.http.config.HttpConfig;
 import org.apache.seatunnel.connectors.seatunnel.http.config.HttpParameter;
 
 import java.util.HashMap;
 import java.util.Map;
 import java.util.Objects;
+import java.util.Optional;
 
 public class PrometheusSink extends AbstractSimpleSink<SeaTunnelRow, Void>
         implements SupportMultiTableSink {
 
     protected final HttpParameter httpParameter = new HttpParameter();
-    protected SeaTunnelRowType seaTunnelRowType;
+    protected CatalogTable catalogTable;
     protected ReadonlyConfig pluginConfig;
 
-    public PrometheusSink(ReadonlyConfig pluginConfig, SeaTunnelRowType rowType) {
+    public PrometheusSink(ReadonlyConfig pluginConfig, CatalogTable catalogTable) {
         this.pluginConfig = pluginConfig;
         httpParameter.setUrl(pluginConfig.get(HttpConfig.URL));
         if (pluginConfig.getOptional(HttpConfig.HEADERS).isPresent()) {
@@ -45,7 +46,7 @@ public PrometheusSink(ReadonlyConfig pluginConfig, SeaTunnelRowType rowType) {
         if (pluginConfig.getOptional(HttpConfig.PARAMS).isPresent()) {
             httpParameter.setHeaders(pluginConfig.get(HttpConfig.PARAMS));
         }
-        this.seaTunnelRowType = rowType;
+        this.catalogTable = catalogTable;
 
         if (Objects.isNull(httpParameter.getHeaders())) {
             Map<String, String> headers = new HashMap<>();
@@ -67,6 +68,12 @@ public String getPluginName() {
 
     @Override
     public PrometheusWriter createWriter(SinkWriter.Context context) {
-        return new PrometheusWriter(seaTunnelRowType, httpParameter, pluginConfig);
+        return new PrometheusWriter(
+                catalogTable.getSeaTunnelRowType(), httpParameter, pluginConfig);
+    }
+
+    @Override
+    public Optional<CatalogTable> getWriteCatalogTable() {
+        return Optional.ofNullable(catalogTable);
     }
 }

seatunnel-connectors-v2/connector-prometheus/src/main/java/org/apache/seatunnel/connectors/seatunnel/prometheus/sink/PrometheusSinkFactory.java

@@ -39,7 +39,7 @@ public TableSink createSink(TableSinkFactoryContext context) {
 
         ReadonlyConfig readonlyConfig = context.getOptions();
         CatalogTable catalogTable = context.getCatalogTable();
-        return () -> new PrometheusSink(readonlyConfig, catalogTable.getSeaTunnelRowType());
+        return () -> new PrometheusSink(readonlyConfig, catalogTable);
     }
 
     @Override