in src/fluent-plugin-mdsd/lib/fluent/plugin/out_mdsd.rb [227:235]
def get_schema_value_str(record)
resultStr = ""
schema_obj = @schema_mgr.get_schema_info(record)
resultStr << schema_obj[0].to_s << "," << schema_obj[1] << ","
resultStr << get_record_values(record)
return resultStr
end