private boolean addExtraColumn4AdditionalEntity(SQLDatabaseModelExtension sqlDBModelExtension,
                                                    List<ModelColumn> modelColumns,
                                                    String extraColumn, List<String> additionalTables) {
        for (ModelColumn modelColumn : modelColumns) {
            if (modelColumn.getColumnName().getName().equals(extraColumn)) {
                additionalTables.forEach(tableName -> {
                    sqlDBModelExtension.appendAdditionalTable(tableName, modelColumn);
                });
                return true;
            }
        }
        return false;
    }
Read model column metadata based on the class level definition.
oap-server/server-core/src/main/java/org/apache/skywalking/oap/server/core/storage/model/StorageModels.java