in src/main/java/com/aliyun/odps/kafka/connect/converter/FlattenRecordConverter.java [24:35]
public FlattenRecordConverter(RecordConverterBuilder.Mode mode, TableSchema schema) {
this.mode = mode;
for (int i = 0; i < schema.getColumns().size(); i++) {
String cur = schema.getColumn(i).getName().toLowerCase();
colNames.add(cur);
lookID.put(cur, i);
}
String[] fixedColumns = {TOPIC, PARTITION, OFFSET};
for (String column : fixedColumns) {
checkColumnExist(column);
}
}