Related to "exists"

Check if a value exists

Use the Flux exists operator to check if a record contains a key or if that key’s value is null.

filter() function

The filter() function filters data based on conditions defined in a predicate function (fn).

map() function

The map() function applies a function to each record in the input tables.

reduce() function

The reduce() function aggregates records in each table according to the reducer, fn, providing a way to create custom table aggregations.