presto-main/src/main/java/io/prestosql/sql/planner/DistributedExecutionPlanner.java/DistributedExecutionPlanner/closeSplitSource
class DistributedExecutionPlanner:    private static void closeSplitSource(SplitSource source)
    {
        try {
            source.close();
        }
        catch (Throwable t) {
            log.warn(t, "Error closing split source");
        }
    }