lowestCurrent() function

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lowestCurrent() selects the last record from each input table and returns the lowest n records.

Note: lowestCurrent() drops empty tables.

Function type signature

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Parameters

n

({{< req >}}) Number of records to return.

column

Column to evaluate. Default is _value.

groupColumns

List of columns to group by. Default is [].

tables

Input data. Default is piped-forward data (<-).

Examples

Return the lowest current value from a stream of tables

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Input data

_time	_value	*tag
2021-01-01T00:00:00Z	-2	t1
2021-01-01T00:00:10Z	10	t1
2021-01-01T00:00:20Z	7	t1
2021-01-01T00:00:30Z	17	t1
2021-01-01T00:00:40Z	15	t1
2021-01-01T00:00:50Z	4	t1

_time	_value	*tag
2021-01-01T00:00:00Z	19	t2
2021-01-01T00:00:10Z	4	t2
2021-01-01T00:00:20Z	-3	t2
2021-01-01T00:00:30Z	19	t2
2021-01-01T00:00:40Z	13	t2
2021-01-01T00:00:50Z	1	t2

Output data

_time	_value	tag
2021-01-01T00:00:50Z	1	t2

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