pluck

Return an array of the values of a specified field in the batch. The resulting array is stored in a field called "pluck".

put|reduce pluck(field)

Parameter	Description	Required?
field	The field to pluck	Yes

Example

This example uses the batch processor.

// On historical data, you can apply reducer to get a single computation,
// or batch your historical data by time, then reduce per batch period.

sub historical_points() {
  emit -from :0: -limit 10 
  | put value = Math.floor(Math.random() * 100)
} 
historical_points 
| reduce values = pluck(value)
| view table -title "List values of all historical points"
;
historical_points 
| batch 5 
| reduce values = pluck(value) 
| view table
    -update "append" 
    -title "List values of points per 5-second batch, historical"
;

// On live streaming data, you must batch by time, then reduce per batch period.

sub live_points() {
emit -limit 10 
| put value = Math.floor(Math.random() * 100)
}
live_points 
| batch 3 
| reduce values = pluck(value)
| view table 
    -update "append" 
    -title "List values of points per 3-second batch, live"
;