Group Loop Start

When starting a loop with this node, each iteration processes another group of rows. Specify the column(s) to group on and the input data table is sorted based on the specified columns before looping starts, by default. Sorting can be switched off if input data table is already properly sorted based on the columns to group on. If sorting is switched off, but input table is not properly sorted execution will fail.

Options

Category columns

The columns used to identify the groups.

Sorting option

Enhance performance by selecting 'Keep input data order' if your data is already sorted by the group columns. Be cautious: if the input is not properly sorted, the node will fail. If you want to make sure that this node executes, do not choose this option.

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Links

• KNIME E-Learning Course: Section 7.2. Re-executing Workflow Parts: Loops

  www.knime.com/knime-introductory-course/chapter7/section2
• Selecting the top 50 rows of a table by a control columnby armingrudd on 2019-11-05

  forum.knime.com/p/74011
• How to “chunk” based on field contentby izaychik63 on 2020-03-06

  forum.knime.com/p/83616
• Moving Aggregation By Categoryby HansS on 2020-07-23

  forum.knime.com/p/97817
• Replace missing values based on another columnby armingrudd on 2019-08-26

  forum.knime.com/p/68713
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Developers