code: public void delete(String tableName, String geometryColumnName) {
  
  		if (has(tableName, geometryColumnName)) {
  			drop(tableName, geometryColumnName);
  
  			try {
  				extensionsDao.deleteByExtension(EXTENSION_NAME, tableName,
  						geometryColumnName);
  			} catch (SQLException e) {
  				throw new GeoPackageException(
  						"Failed to delete RTree Index extension. GeoPackage: "
  								+ geoPackage.getName() + ", Table: "
  								+ tableName + ", Geometry Column: "
  								+ geometryColumnName, e);
  			}
  		}
  
  	}
docs: Delete the RTree Index extension for the table and geometry column. Drops
  the triggers, RTree table, and deletes the extension.
  
  @param tableName
  table name
  @param geometryColumnName
  geometry column name