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Recipe steps that change the number of rows in the dataset have additional impacts on your dataset and its samples. These reshaping steps include the following transformations:

Transformation	Documentation
Splitrows	Initial Parsing Steps
Expand Arrays into Rows	Working with Arrays
Filter Rows (keep or delete)	Remove Data
Pivot Table	Pivot Data
Unpivot Columns	Unpivot Columns
Join Datasets	Join Window
Union Datasets	Union Page
Select Lookup from the column menu	Lookup Wizard
Remove Duplicate Rows	Remove Data

Samples:

When one of these transformations is applied and rows are removed from your dataset:

Any samples generated before the step was added are invalidated and cannot be used.
If you edit steps in your recipe before this added transformation, any samples that you generated after the step are invalidated and cannot be used.

A valid initial sample is always available for use.

For more information, see Samples Panel.