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Use case for do-nothing-node

The flow variable port is active regardlessof the switch port so the new data isalways added to the output which is notwhat we require A dummy node to add zero empty rows isused to enable the flow variable port to beactivated only if the input data is an emptytableSo now the new data is only used if noinput data was received populated Feeding tableNode 3Use existing data if not emptyotherwise get new dataApply different dataonly if feeding table was emptyEmpty Feeding tableNode 9Use existing data if not emptyotherwise get new dataApply different dataonly if feeding table was emptyAdd zero rowsie do nothingEmpty Feeding tablepopulated Feeding table Table Creator End IF Empty Table Switch Table Creator Table Creator End IF Empty Table Switch Table Creator Add Empty Rows Table Creator Table Creator The flow variable port is active regardlessof the switch port so the new data isalways added to the output which is notwhat we require A dummy node to add zero empty rows isused to enable the flow variable port to beactivated only if the input data is an emptytableSo now the new data is only used if noinput data was received populated Feeding tableNode 3Use existing data if not emptyotherwise get new dataApply different dataonly if feeding table was emptyEmpty Feeding tableNode 9Use existing data if not emptyotherwise get new dataApply different dataonly if feeding table was emptyAdd zero rowsie do nothingEmpty Feeding tablepopulated Feeding tableTable Creator End IF Empty Table Switch Table Creator Table Creator End IF Empty Table Switch Table Creator Add Empty Rows Table Creator Table Creator

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Created by: @takbb Brian Bates
Created at: 2021-07-06
On NodePit since: 2022-02-06
Last update: 2024-12-18
Created with KNIME version: v4.3.3

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