Hi there @a_pavlenko ,
welcome to KNIME Community!
Warning message you see is cause configure method which is called each time an upstream node’s settings changes. Although topic about development, it has nice explanation:
Hi @bfrutchey ,
the configure method is used to determine the output the node will produce when execute is called. This description of the output, e.g. the table spec if the output port is a data table, is then passed on to the following nodes. They in turn execute their configure method to pass on their output again. So any time the output might change, configure is called. Concretely, that is when the settings of the node change or when an upstream node’s settings changed, when a new connectio…
Hope this contributes to your understanding
Br,
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