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Trifacta Dataprep


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On January 27, 2021, Google is changing the required permissions for attaching IAM roles to service accounts. If you are using IAM roles for your Google service accounts, please see Changes to User Management.

 

Window functions apply to a subset of rows (a window) relative to the current row for computational purposes. These functions can be applied to the following transforms:

Primary Key:

When window functions are used, each row in the windowed output should be identified by a primary key. This primary key, which identifies unique rows, can be specified in one of the following ways:

  • The Order by field indicates unique row identifiers. This field can contain one or more column references.  
  • A combination of Order by andGroup by fields can create a unique identifier for each row.

This primary key requirement applies to window functions used with any supported transform. 

NOTE: Null values are ignored as inputs to these functions.

 

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