schema.tagKeys() function
The schema.tagKeys()
function returns a list of tag keys for all series that match the predicate
. The return value is always a single table with a single column, _value
.
import "influxdata/influxdb/schema"
schema.tagKeys(
bucket: "example-bucket",
predicate: (r) => true,
start: -30d
)
Parameters
bucket
Bucket to return tag keys from.
*Data type: String*
predicate
Predicate function that filters tag keys. Defaults to (r) => true
.
*Data type: Function*
start
Oldest time to include in results. Defaults to -30d
.
Relative start times are defined using negative durations. Negative durations are relative to now. Absolute start times are defined using time values.
*Data type: Duration*
Examples
import "influxdata/influxdb/schema"
schema.tagKeys(bucket: "my-bucket")
Function definition
package schema
tagKeys = (bucket, predicate=(r) => true, start=-30d) =>
from(bucket: bucket)
|> range(start: start)
|> filter(fn: predicate)
|> keys()
|> keep(columns: ["_value"])
|> distinct()
*Used functions: from, range, filter, keys, keep, distinct*