follow_not

Type of operation: Join

Description

Return the rows from the joined dataset that do not have a match anywhere in the query time window.

follow_not performs a non-temporal antisemijoin. The join will select any rows from the first dataset that do not have at least one matching row in the second dataset.

Usage

follow_not [ frame ], predicate_1, predicate_2, ...

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

Accelerable

follow_not 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

follow_not [email protected]_id

Antisemijoin the default dataset with the ‘right’ dataset, returning rows from ‘right’ where there does not exists a key match at any point in time within the query window.

follow_not frame(back:30m), [email protected]_id

Antisemijoin the default dataset with the ‘right’ dataset, returning rows from ‘right’ where there does not exists a key match within 30 minutes in time.