docs: public String getGeometryProperty(TableRef tableRef) {
          TableMapping tableMapping = mappedClasses.get(tableRef);
          if (tableMapping == null) {
              return null;
          }
          for (ColumnMetaData columnMetaData : tableMapping.getMappedColumns()) {
              if (columnMetaData.isGeometry()) {
                  ColumnMapping cm = tableMapping.getColumnMapping(columnMetaData);
                  return cm.getPropertyName();
              }
          }
          return null;
      }