exists

Type of operation: Join

Description

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

Usage

exists [ frame ], predicate_1, predicate_2, ...

Argument	Type	Optional	Repeatable	Restrictions
frame	frame	yes	no	constant
predicate	bool	no	yes	none

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.