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

Output fields

Output fields

When you connect upstream transformations to a Union transformation, you initialize the output fields. The initial output fields are an exact copy of the input fields in group Input1.
When you define output fields, note the following:
  • After you initialize the output fields, you cannot change the output fields by connecting or disconnecting the input group.
  • You can manually add output fields if you add them before you connect one of the Union transformation input groups.
  • When you add an output field, you define the field name, data type, precision, scale, and optional description. The description can contain up to 4000 characters.
  • If you connect the Union transformation to an upstream transformation that does not pass in any fields, the output fields are not initialized.
  • At run time, the mapping passes null values to output fields that are not in a field mapping.