Column Expressions Guidance: Dynamically set Column Type

[ArjenEX]

Hi @mwiegand

You need to use the actual data class. For string it’s org.knime.core.data.def.StringCell , for integer it’s org.knime.core.data.def.IntCell.

You can derive this information from the Flow Variable section by assigning a temporary field to it. How to do this:

Flow Variable Names

Hi @rfeigel Guess who’s back Hack modus on: Go to any node → open the flow variable section → fill in random numbers in the text box that is located after the variable and run the node → open the node preview → switch to the Flow Variables tab → bingo. [image] [image] Hopefully this will save you some time in the future!

Wherever you create this, if you pass this value to the Column Expression, cell_class flow variable like you have found already, it will work.

Hope this helps!