private void initMetric() {
        parseErrorRecords = getRuntimeContext().getMetricGroup().counter(MetricConstant.DT_NUM_SIDE_PARSE_ERROR_RECORDS);
    }
All interfaces inherit naming rules: type + "AsyncReqRow" such as == "MysqlAsyncReqRow
only support Left join / inner join(join),not support right join
Date: 2018/7/9
Company: www.dtstack.com

@author xuchao
core/src/main/java/com/dtstack/flink/sql/side/BaseAsyncReqRow.java