Aggregate¶
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.
Warning
The parameterization will change in the future to support other aggregate operations.
Parameters¶
groupby-
Type: array
Which fields to use for grouping. Missing
groupbyresults in a single group that includes all the data items.
Example¶
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 |