private String getNodeKey(String prefix, String nodeName) {
        if (Strings.isNullOrEmpty(prefix)) {
            return nodeName;
        }
        return prefix + "." + nodeName;
    }
source data parse to json format
<p>
Date: 2019/12/12
Company: www.dtstack.com

@author maqi
core/src/main/java/com/dtstack/flink/sql/format/dtnest/DtNestRowDeserializationSchema.java