presto-main/src/main/java/io/prestosql/execution/SqlTaskExecution.java/SqlTaskExecution/setNoMoreSplits
class SqlTaskExecution:        public void setNoMoreSplits()
        {
            if (noMoreSplits) {
                return;
            }
            noMoreSplits = true;
            for (PendingSplits splitsForLifespan : splitsByLifespan.values()) {
                splitsForLifespan.noMoreSplits();
            }
        }