public JsonNode getPhysicalData(JsonNode root) {
        JsonNode physicalData = getUpdateAfter(root);
        if (physicalData == null) {
            physicalData = getUpdateBefore(root);
        }
        return physicalData;
    }
Get physical data from the root json node

@param root The json root node
@return The physical data node
inlong-sort/sort-flink/base/src/main/java/org/apache/inlong/sort/base/format/JsonDynamicSchemaFormat.java