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  1. Preface
  2. The Transformation Language
  3. Constants
  4. Operators
  5. Variables
  6. Dates
  7. Functions
  8. Creating Custom Functions
  9. Custom Function API Reference

Transformation Language Reference

Transformation Language Reference

Null Values in Filter Conditions

Null Values in Filter Conditions

If a filter condition evaluates to NULL, the function does not select the record. If the filter condition evaluates to NULL for all records in the selected port, the aggregate function returns NULL (except COUNT, which returns 0). You can use filter conditions with aggregate functions and the CUME, MOVINGAVG, and MOVINGSUM functions.