Documentation

Fill null values in data

See the equivalent InfluxDB v2.6 documentation: Fill null values in data.

Use the fill() function to replace null values with:

data
    |> fill(usePrevious: true)

// OR

data
    |> fill(value: 0.0)

Fill empty windows of time

The fill() function does not fill empty windows of time. It only replaces null values in existing data. Filling empty windows of time requires time interpolation (see influxdata/flux#2428).

Fill with the previous value

To fill null values with the previous non-null value, set the usePrevious parameter to true.

Values remain null if there is no previous non-null value in the table.

data
    |> fill(usePrevious: true)

Given the following input:

_time_value
2020-01-01T00:01:00Znull
2020-01-01T00:02:00Z0.8
2020-01-01T00:03:00Znull
2020-01-01T00:04:00Znull
2020-01-01T00:05:00Z1.4

fill(usePrevious: true) returns:

_time_value
2020-01-01T00:01:00Znull
2020-01-01T00:02:00Z0.8
2020-01-01T00:03:00Z0.8
2020-01-01T00:04:00Z0.8
2020-01-01T00:05:00Z1.4

Fill with a specified value

To fill null values with a specified value, use the value parameter to specify the fill value. The fill value must match the data type of the column.

data
    |> fill(value: 0.0)

Given the following input:

_time_value
2020-01-01T00:01:00Znull
2020-01-01T00:02:00Z0.8
2020-01-01T00:03:00Znull
2020-01-01T00:04:00Znull
2020-01-01T00:05:00Z1.4

fill(value: 0.0) returns:

_time_value
2020-01-01T00:01:00Z0.0
2020-01-01T00:02:00Z0.8
2020-01-01T00:03:00Z0.0
2020-01-01T00:04:00Z0.0
2020-01-01T00:05:00Z1.4

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InfluxDB Cloud backed by InfluxDB IOx

All InfluxDB Cloud organizations created on or after January 31, 2023 are backed by the new InfluxDB IOx storage engine. Check the right column of your InfluxDB Cloud organization homepage to see which InfluxDB storage engine you’re using.

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InfluxDB Cloud backed by InfluxDB TSM

All InfluxDB Cloud organizations created on or after January 31, 2023 are backed by the new InfluxDB IOx storage engine which enables nearly unlimited series cardinality and SQL query support. Check the right column of your InfluxDB Cloud organization homepage to see which InfluxDB storage engine you’re using.

If powered by TSM, this is the correct documentation.

If powered by IOx, see the IOx-based InfluxDB Cloud documentation.

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