Table of Contents

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  1. Preface
  2. Transformations
  3. Source transformation
  4. Target transformation
  5. Aggregator transformation
  6. Cleanse transformation
  7. Data Masking transformation
  8. Deduplicate transformation
  9. Expression transformation
  10. Filter transformation
  11. Hierarchy Builder transformation
  12. Hierarchy Parser transformation
  13. Hierarchy Processor transformation
  14. Input transformation
  15. Java transformation
  16. Java transformation API reference
  17. Joiner transformation
  18. Labeler transformation
  19. Lookup transformation
  20. Mapplet transformation
  21. Normalizer transformation
  22. Output transformation
  23. Parse transformation
  24. Python transformation
  25. Rank transformation
  26. Router transformation
  27. Rule Specification transformation
  28. Sequence Generator transformation
  29. Sorter transformation
  30. SQL transformation
  31. Structure Parser transformation
  32. Transaction Control transformation
  33. Union transformation
  34. Velocity transformation
  35. Verifier transformation
  36. Web Services transformation

Transformations

Transformations

Nested aggregate functions

Nested aggregate functions

A nested aggregate function is an aggregate function within another aggregate function.
For example, the following expression sums sales and returns the highest number:
MAX( SUM( SALES ))
You can include multiple single-level or multiple nested functions in different output fields in an Aggregator transformation. You cannot include both single-level and nested functions in an Aggregator transformation. You cannot nest aggregate functions in an
elastic mapping
.
When an Aggregator transformation contains a single-level function in any output field, you cannot use a nested function in any other field in that transformation. If you need to create both single-level and nested functions, create separate Aggregator transformations.