exists [frame(...)]?, [predicate: bool]+

Return the rows from the default dataset that have a match anywhere in the query time window. (Non-temporal semijoin).

Categories

• Join

Accelerable

exists is accelerable if there is a frame() argument. A dataset that only uses accelerable verbs can be accelerated, making queries on the dataset respond faster.

Examples

exists sensor_id=@right.sensor_id

Semijoin the default dataset with the 'right' dataset, returning rows from 'default' where there exists a key match at any point in time within the query window.

exists frame(back:30m), sensor_id=@right.sensor_id

Semijoin the default dataset with the 'right' dataset, returning rows from 'default' where there exists a key match within 30 minutes in time.

exists sensor_id=@right.sensor_id and sensor_value>@right.sensor_value

Semijoin the default dataset with the 'right' dataset, returning rows from 'default' where sensor_value is greater than the value from 'right' for the same sensor_id at any point in time within the query window.