presto-main/src/main/java/io/prestosql/operator/NestedLoopJoinPagesSupplier.java/NestedLoopJoinPagesSupplier/destroy
class NestedLoopJoinPagesSupplier:    @Override
    public void destroy()
    {
        // Let the NestedLoopBuildOperator declare that it's finished.
        pagesNoLongerNeeded.set(null);
    }