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The "aggregate" transform is currently minimal – it adds a new count field that contains the number of data items in a group. More aggregate operations will be added later.


Which fields to use for grouping. Missing groupby results in a single group that includes all the data items.


Given the following data:

x y
first 123
first 456
second 789

... and configuration:

  "type": "aggregate",
  "groupby": ["x"]

A new list of data objects is created:

x count
first 2
second 1