This node has exactly the same functionality as the Row Filter node, except for that it has an additional output that provides the rows that are filtered out. For performance and disk space reasons you may want to consider using the Row Filter node. The table at the upper port (with index 0) contains the rows included in the result according to the filter criteria (the node settings). The lower port (with index 1) provides a table with all rows not matching the filter criteria. The sum of the number of rows in the two output tables is the same than the number of rows in the input table.
Following is a copy of the node description of the Row Filter node:
The node allows for row filtering according to certain criteria. It can include or exclude: certain ranges (by row number), rows with a certain row ID, and rows with a certain value in a selectable column (attribute). Below are the steps on how to configure the node in its configuration dialog. Note: The node doesn't change the domain of the data table. I. e. the upper and lower bounds or the possible values in the table spec are not adapted, even if one of the bounds or one value is fully filtered out.