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  • If an input value is missing or null, it is not factored in the computation. For example, for the first row in the dataset, the rolling average of previous values is the value in the first row.
  • The row from which to extract a value is determined by the order in which the rows are organized based on the order parameter. If you are working on a randomly generated sample of your dataset, the values that you see for this function might not correspond to the values that are generated on the full dataset during job execution.
  • The function takes a column name and two integer parameters that determine the window backward and forward of the current row.
    • The default integer parameter values are -1 and 0, which computes the rolling average from the current row back to the first row of the dataset.

This function works only with the  window transform, which is used to create computational windows within a dataset. For more information, see Window Transform.with the following transforms:

D s

Rows before example: