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For smaller datasets, the Transformer page displays the entire dataset. For larger ones, the 

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 samples data from the set for use in the Transformer page. 

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NOTE: If you add recipe steps that change the number of rows in your dataset (or a few other edge case steps), some of your existing samples may no longer be valid. When you execute a join, union, or delete action or edit steps before this action, you may be prompted with the Change Recipe dialog, which includes the following message:

Your change will invalidate some of the currently available samples for this source. The invalid samples will be deactivated.

Though the Sampling menu, you can create a new sample for the modified dataset.

For more information on these types of operations, see Reshaping Steps.

Sample Bar

At the top of the data grid, you can review information about the currently displayed sample:

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Sample Bar
By default, the application loads the first N rows of the dataset as the sample, the number of which depends on column count, data density, and other factors. If the dataset is small enough, the Full Dataset is used. 

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NOTE: By default, samples may be up to 10 MB in size. For datasets smaller than this limit, the entire dataset is loaded.

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NOTE: When sampling from compressed data, the source is uncompressed, and a new sample of it is loaded into the data grid. As a result, the sample size you see in the grid corresponds to the uncompressed data.

  • To review details on the individual columns of your dataset, click the Columns link. See Column Browser Panel.
  • Click the Data Types link to review counts of the columns of each type. See Supported Data Types.

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