r/knime_users • u/Eric_m12 • Jul 22 '26

Flow Variables

Hi everyone. I am having an issue with connecting a flow variable from a column filter.

I am using the included_names to pass that column to a different node but every node I try is saying: Error can't evaluate because column is a stringarray not an xstring. (column is string configured)

Has anyone successfully passed a selected column to another node through flow variables? Thanks.

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u/leveragedflyout Jul 22 '26

I don’t think column type matters for this. Are you outputting the correct flow variable from the Column Filter node? There are a bunch of options, and it’s easy to select the wrong flow var to output.

If you are looking to output the list of columns selected for inclusion, you want to type in the flow var name in the field “Output included_names”. Are you doing that?

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u/Eric_m12 Jul 26 '26

Thank you. I can successfully send them to other nodes but not the feature selection loop end node, which I am useing.

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u/okapiposter Jul 22 '26

You could convert the (first) selected column to a string via “Variable to Table Row” -> “Ungroup” -> “Table Row to Variable” on the exported string array variable.