public void addPersistentField(String fieldName, String columnName, Class<?> type) {
        if (persistentFields == null) {
            persistentFields = new ArrayList<>();
        }
        DataColumn dataColumn = new DataColumn(fieldName, columnName, type);
        persistentFields.add(dataColumn);
    }
Fields generated by {@link #fieldsFromSource} and {@link #persistentFields}. These fields are used in final
persistence.
oap-server/oal-rt/src/main/java/org/apache/skywalking/oal/rt/parser/AnalysisResult.java