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

Unconnected lookups

Unconnected lookups

An unconnected Lookup transformation is a Lookup transformation that is not connected to other transformations in a mapping. A transformation in the mapping pipeline calls the Lookup transformation with a :LKP expression. The unconnected Lookup transformation returns one column to the calling transformation.
You can use an unconnected Lookup transformation to perform a lookup against the following types of data objects:
  • Flat file
  • Relational database
  • Amazon Redshift V2
  • Amazon S3 V2
  • Google BigQuery V2
  • Microsoft Azure Synapse SQL
  • Snowflake Cloud Data Warehouse V2
The following table lists the differences between connected and unconnected Lookup transformations:
Functionality
Connected lookup
Unconnected lookup
Input values
Receives input values directly from the mapping pipeline.
Receives input values from the result of a :LKP expression in another transformation.
Cache
Cache includes all lookup columns used in the mapping. This includes columns in the lookup condition and columns linked as output fields to other transformations.
Can use static or dynamic cache.
Cache includes all lookup/output fields in the lookup condition and the lookup/return field.
Cannot use dynamic cache.
Return values
Returns multiple values from the same row.
Returns the specified field for each row.
Lookup conditions
If there is no match for a lookup condition,
Data Integration
returns the default value for all output fields.
If there is a match,
Data Integration
returns the results of the lookup condition for all lookup/output fields.
If there is no match for the lookup condition,
Data Integration
returns NULL.
If there is a match,
Data Integration
returns the result of the lookup condition to the return field.
Output values
Passes multiple output values to another transformation. Links lookup/output fields to another transformation.
Passes one output value to another transformation. The lookup/output/return field passes the value to the transformation that contains the :LKP expression.