docs: public void removeTupleSink(final LeftTupleSink tupleSink) {
          if ( this.sink instanceof EmptyLeftTupleSinkAdapter ) {
              throw new IllegalArgumentException( "Cannot remove a sink, when the list of sinks is null" );
          }
  
          if ( this.sink instanceof SingleLeftTupleSinkAdapter ) {
              this.sink = EmptyLeftTupleSinkAdapter.getInstance();
          } else {
              final CompositeLeftTupleSinkAdapter sinkAdapter = (CompositeLeftTupleSinkAdapter) this.sink;
              sinkAdapter.removeTupleSink( tupleSink );
              if ( sinkAdapter.size() == 1 ) {
                  this.sink = new SingleLeftTupleSinkAdapter( this.getPartitionId(), sinkAdapter.getSinks()[0] );
              }
          }
      }