Warning! This page documents an earlier version of Flux, which is no longer actively developed. Flux v0.50 is the most recent stable version of Flux.
The fill() function replaces all null values in an input stream with a non-null value.
Function type: Transformation
fill(column: "_value", value: 0.0)
// OR
fill(column: "_value", usePrevious: true)
Parameters
column
The column in which to replace null values. Defaults to "_value".
Data type: String
value
The constant value to use in place of nulls.
The value type must match the value type of the column.
Data type: Boolean | Integer | UInteger | Float | String | Time | Duration
usePrevious
When true, assigns the value set in the previous non-null row.
Cannot be used with
value.
Data type: Boolean | Integer | UInteger | Float | String | Time | Duration
Examples
Fill null values with a specified non-null value
from(bucket: "telegraf/autogen")
|> range(start: -1h)
|> filter(fn: (r) =>
r._measurement == "cpu" and
r.cpu == "cpu-total"
)
|> fill(value: 0.0)
Fill null values with the previous non-null value
from(bucket: "telegraf/autogen")
|> range(start: -1h)
|> filter(fn: (r) =>
r._measurement == "cpu" and
r.cpu == "cpu-total"
)
|> fill(usePrevious: true)