public boolean checkNeedAssignWaterMarker(AbstractSourceTableInfo tableInfo){
        return !Strings.isNullOrEmpty(tableInfo.getEventTimeField());
    }
define watermarker
Date: 2018/6/29
Company: www.dtstack.com
@author xuchao
core/src/main/java/com/dtstack/flink/sql/watermarker/WaterMarkerAssigner.java