If more than one input table is available the node concatenates all input rows into a single result table. If the input tables contain the same row ID the node can either generate a new row ID or prepend the input table index to the original row ID of the corresponding input table.
This setting has special implications if you are changing the input table without reconfiguring the node. If Intersection is selected any column that moves into the intersection during execution will be considered to be new, even if it was previously part of the union of columns.
It is also important to note that the transformation matching during execution is based on name. That means if there was a column [A, Integer] during configuration in the dialog and this column becomes [A, String] during execution, then the stored transformation is applied to it. For filtering, ordering and renaming, this is straight forward. For type mapping the following is done: If there is an alternative converter to the specified KNIME type, then this converter is used, otherwise we default to the default KNIME type for the new type. In our example we might have specified that [A, Integer] should be mapped to Long. For the changed column [A, String] there is no converter to Long, so we default back to String and A becomes a String column in the output table.
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To use this node in KNIME, install the extension KNIME Base nodes from the below update site following our NodePit Product and Node Installation Guide:
A zipped version of the software site can be downloaded here.
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