code: public static List<Object> querySingleColumnResults(Connection connection,
  			String sql, String[] args, int column, GeoPackageDataType dataType,
  			Integer limit) {
  		ResultSetResult result = wrapQuery(connection, sql, args);
  		List<Object> results = ResultUtils.buildSingleColumnResults(result,
  				column, dataType, limit);
  		return results;
  	}
docs: Query for values from a single column up to the limit
  
  @param connection
  connection
  @param sql
  sql statement
  @param args
  arguments
  @param column
  column index
  @param dataType
  GeoPackage data type
  @param limit
  result row limit
  @return single column results
  @since 3.1.0