Table of Contents

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  1. Preface
  2. Transformations
  3. Source transformation
  4. Target transformation
  5. Access Policy transformation
  6. Aggregator transformation
  7. B2B transformation
  8. Cleanse transformation
  9. Data Masking transformation
  10. Data Services transformation
  11. Deduplicate transformation
  12. Expression transformation
  13. Filter transformation
  14. Hierarchy Builder transformation
  15. Hierarchy Parser transformation
  16. Hierarchy Processor transformation
  17. Input transformation
  18. Java transformation
  19. Java transformation API reference
  20. Joiner transformation
  21. Labeler transformation
  22. Lookup transformation
  23. Machine Learning transformation
  24. Mapplet transformation
  25. Normalizer transformation
  26. Output transformation
  27. Parse transformation
  28. Python transformation
  29. Rank transformation
  30. Router transformation
  31. Rule Specification transformation
  32. Sequence transformation
  33. Sorter transformation
  34. SQL transformation
  35. Structure Parser transformation
  36. Transaction Control transformation
  37. Union transformation
  38. Velocity transformation
  39. Verifier transformation
  40. Web Services transformation

Transformations

Transformations

Expression macros

Expression macros

An expression macro is a macro that you use to create repetitive or complex expressions in mappings.
You can use an expression macro to perform calculations across a set of fields or constants. For example, you might use an expression macro to replace null values in a set of fields or to label items based on a set of sales ranges.
In an expression macro, one or more input fields represent source data for the macro. An expression represents the calculations that you want to perform. And an output field represents the results of the calculations.
At run time, the task expands the expression to include all of the input fields and constants, and then writes the results to the output fields.
You can create expression macros in Expression and Aggregator transformations but you cannot combine an expression macro and an in-out parameter in an Expression transformation.

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