Table of Contents

Search

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

Transformations

Transformations

Partition and order keys

Partition and order keys

Configure partition and order keys to form groups of rows and define the order or sequence of rows within each partition.
Use the following keys to group and order the rows in a window:
Partition keys
Configure partition keys to define partition boundaries rather than performing the calculation across all rows.
If you do not specify partition keys, all the data is included in the same partition.
Order keys
Use order keys to determine how rows in a partition are ordered. Order keys define the position of a particular row in a partition.
You must also arrange the data in ascending or descending order. If you do not specify order keys, the rows in a partition are arranged randomly.
Consider the following rules and guidelines when you define window properties for partition and order keys:
  • You cannot use hierarchical fields as partition or order keys.
  • Define unique fields as partition and order keys.

Example

You are the owner of a coffee and tea shop. You want to calculate the best-selling and second best-selling coffee and tea products.
The following table lists the products, the corresponding product categories, and the revenue from each product:
Product
Category
Revenue
Espresso
Coffee
600
Black
Tea
550
Cappuccino
Coffee
500
Americano
Coffee
600
Oolong
Tea
250
Macchiato
Coffee
300
Green
Tea
450
White
Tea
650
You partition the data by category and order the data by descending revenue.
The following table shows the data grouped into two partitions according to category. Within each partition, the revenue is organized in descending order:
Product
Category
Revenue
Espresso
Coffee
600
Americano
Coffee
600
Cappuccino
Coffee
500
Macchiato
Coffee
300
White
Tea
650
Black
Tea
550
Green
Tea
450
Oolong
Tea
250
You can run the MAX function within each partition to determine that the two best-selling coffees are espresso and Americano, and the two best-selling teas are white and black.

0 COMMENTS

We’d like to hear from you!