bryanck commented on code in PR #9641:
URL: https://github.com/apache/iceberg/pull/9641#discussion_r1521807811


##########
kafka-connect/kafka-connect/src/main/java/org/apache/iceberg/connect/data/RecordConverter.java:
##########
@@ -0,0 +1,508 @@
+/*
+ * 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.iceberg.connect.data;
+
+import com.fasterxml.jackson.databind.ObjectMapper;
+import java.io.IOException;
+import java.io.UncheckedIOException;
+import java.math.BigDecimal;
+import java.math.RoundingMode;
+import java.nio.ByteBuffer;
+import java.nio.charset.StandardCharsets;
+import java.time.LocalDate;
+import java.time.LocalDateTime;
+import java.time.LocalTime;
+import java.time.OffsetDateTime;
+import java.time.ZoneOffset;
+import java.time.format.DateTimeFormatter;
+import java.time.format.DateTimeFormatterBuilder;
+import java.time.format.DateTimeParseException;
+import java.time.temporal.Temporal;
+import java.util.Base64;
+import java.util.Date;
+import java.util.List;
+import java.util.Map;
+import java.util.UUID;
+import java.util.stream.Collectors;
+import org.apache.iceberg.Schema;
+import org.apache.iceberg.Table;
+import org.apache.iceberg.TableProperties;
+import org.apache.iceberg.connect.IcebergSinkConfig;
+import org.apache.iceberg.data.GenericRecord;
+import org.apache.iceberg.data.Record;
+import org.apache.iceberg.mapping.MappedField;
+import org.apache.iceberg.mapping.NameMapping;
+import org.apache.iceberg.mapping.NameMappingParser;
+import org.apache.iceberg.relocated.com.google.common.base.Preconditions;
+import org.apache.iceberg.relocated.com.google.common.collect.Maps;
+import org.apache.iceberg.types.Type;
+import org.apache.iceberg.types.Type.PrimitiveType;
+import org.apache.iceberg.types.Types.DecimalType;
+import org.apache.iceberg.types.Types.ListType;
+import org.apache.iceberg.types.Types.MapType;
+import org.apache.iceberg.types.Types.NestedField;
+import org.apache.iceberg.types.Types.StructType;
+import org.apache.iceberg.types.Types.TimestampType;
+import org.apache.iceberg.util.DateTimeUtil;
+import org.apache.kafka.connect.data.Struct;
+
+class RecordConverter {
+
+  private static final ObjectMapper MAPPER = new ObjectMapper();
+
+  private static final DateTimeFormatter OFFSET_TIMESTAMP_FORMAT =
+      new DateTimeFormatterBuilder()
+          .append(DateTimeFormatter.ISO_LOCAL_DATE_TIME)
+          .appendOffset("+HHmm", "Z")
+          .toFormatter();
+
+  private final Schema tableSchema;
+  private final NameMapping nameMapping;
+  private final IcebergSinkConfig config;
+  private final Map<Integer, Map<String, NestedField>> structNameMap = 
Maps.newHashMap();
+
+  RecordConverter(Table table, IcebergSinkConfig config) {
+    this.tableSchema = table.schema();
+    this.nameMapping = createNameMapping(table);
+    this.config = config;
+  }
+
+  Record convert(Object data) {
+    return convert(data, null);
+  }
+
+  Record convert(Object data, SchemaUpdate.Consumer schemaUpdateConsumer) {
+    if (data instanceof Struct || data instanceof Map) {
+      return convertStructValue(data, tableSchema.asStruct(), -1, 
schemaUpdateConsumer);
+    }
+    throw new UnsupportedOperationException("Cannot convert type: " + 
data.getClass().getName());
+  }
+
+  private NameMapping createNameMapping(Table table) {
+    String nameMappingString = 
table.properties().get(TableProperties.DEFAULT_NAME_MAPPING);
+    return nameMappingString != null ? 
NameMappingParser.fromJson(nameMappingString) : null;
+  }
+
+  private Object convertValue(
+      Object value, Type type, int fieldId, SchemaUpdate.Consumer 
schemaUpdateConsumer) {
+    if (value == null) {
+      return null;
+    }
+    switch (type.typeId()) {
+      case STRUCT:
+        return convertStructValue(value, type.asStructType(), fieldId, 
schemaUpdateConsumer);
+      case LIST:
+        return convertListValue(value, type.asListType(), 
schemaUpdateConsumer);
+      case MAP:
+        return convertMapValue(value, type.asMapType(), schemaUpdateConsumer);
+      case INTEGER:
+        return convertInt(value);
+      case LONG:
+        return convertLong(value);
+      case FLOAT:
+        return convertFloat(value);
+      case DOUBLE:
+        return convertDouble(value);
+      case DECIMAL:
+        return convertDecimal(value, (DecimalType) type);
+      case BOOLEAN:
+        return convertBoolean(value);
+      case STRING:
+        return convertString(value);
+      case UUID:
+        return convertUUID(value);
+      case BINARY:
+      case FIXED:
+        return convertBase64Binary(value);
+      case DATE:
+        return convertDateValue(value);
+      case TIME:
+        return convertTimeValue(value);
+      case TIMESTAMP:
+        return convertTimestampValue(value, (TimestampType) type);
+    }
+    throw new UnsupportedOperationException("Unsupported type: " + 
type.typeId());
+  }
+
+  protected GenericRecord convertStructValue(
+      Object value,
+      StructType schema,
+      int parentFieldId,
+      SchemaUpdate.Consumer schemaUpdateConsumer) {
+    if (value instanceof Map) {
+      return convertToStruct((Map<?, ?>) value, schema, parentFieldId, 
schemaUpdateConsumer);
+    } else if (value instanceof Struct) {
+      return convertToStruct((Struct) value, schema, parentFieldId, 
schemaUpdateConsumer);
+    }
+    throw new IllegalArgumentException("Cannot convert to struct: " + 
value.getClass().getName());
+  }
+
+  private GenericRecord convertToStruct(
+      Map<?, ?> map,
+      StructType schema,
+      int structFieldId,
+      SchemaUpdate.Consumer schemaUpdateConsumer) {
+    GenericRecord result = GenericRecord.create(schema);
+    map.forEach(
+        (recordFieldNameObj, recordFieldValue) -> {
+          String recordFieldName = recordFieldNameObj.toString();
+          NestedField tableField = lookupStructField(recordFieldName, schema, 
structFieldId);
+          if (tableField == null) {
+            // add the column if schema evolution is on, otherwise skip the 
value,
+            // skip the add column if we can't infer the type
+            if (schemaUpdateConsumer != null) {
+              Type type = SchemaUtils.inferIcebergType(recordFieldValue, 
config);

Review Comment:
   That being said, I feel like this could be added in a follow up PR.



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