tickscript.join() function
tickscript.join() is a user-contributed function maintained by
the package author.
tickscript.join() merges two input streams into a single output stream
based on specified columns with equal values and appends a new measurement name.
This function is comparable to Kapacitor JoinNode.
Function type signature
(measurement: A, tables: B, ?on: [string]) => stream[{C with _measurement: A}] where B: Record, C: Record
Parameters
tables
(Required) Map of two streams to join.
on
List of columns to join on. Default is ["_time"].
measurement
(Required) Measurement name to use in results.
Examples
Join two streams of data
import "array"
import "contrib/bonitoo-io/tickscript"
metrics =
array.from(
rows: [
{_time: 2021-01-01T00:00:00Z, host: "host1", _value: 1.2},
{_time: 2021-01-01T01:00:00Z, host: "host1", _value: 0.8},
{_time: 2021-01-01T02:00:00Z, host: "host1", _value: 3.2},
{_time: 2021-01-01T00:00:00Z, host: "host2", _value: 8.4},
{_time: 2021-01-01T01:00:00Z, host: "host2", _value: 7.3},
{_time: 2021-01-01T02:00:00Z, host: "host2", _value: 7.9},
],
)
|> group(columns: ["host"])
states =
array.from(
rows: [
{_time: 2021-01-01T00:00:00Z, host: "host1", _value: "dead"},
{_time: 2021-01-01T01:00:00Z, host: "host1", _value: "dead"},
{_time: 2021-01-01T02:00:00Z, host: "host1", _value: "alive"},
{_time: 2021-01-01T00:00:00Z, host: "host2", _value: "alive"},
{_time: 2021-01-01T01:00:00Z, host: "host2", _value: "alive"},
{_time: 2021-01-01T02:00:00Z, host: "host2", _value: "alive"},
],
)
|> group(columns: ["host"])
tickscript.join(
tables: {metric: metrics, state: states},
on: ["_time", "host"],
measurement: "example-m",
)
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