MarkLogic 12 EA 1 Product DocumentationAccessPlan.prototype.existsJoin
AccessPlan.prototype.existsJoin( rightPlan as String, [ondef as String], [condition as xs.boolean] ) as ModifyPlan
Summary
This method is a filtering join that filters based on whether the join exists or not but doesn't add any columns.
It filters the left row set to the rows that have a join in the right row set.
| Parameters | |
|---|---|
| rightPlan | The row set from the right view. |
| ondef | The equijoin from one or more calls to the op.on function. |
| condition | A boolean expression that filters the join output rows. See Boolean Expression Functions for the list of functions used to build boolean expressions. |
Usage Notes
existsJoin is a method of the following classes:
The library functions for building the existsJoin parameters are as follows:
Example
// It filters out {'r1':1, 'k1':'a'} in p1 as value 'a' exists in column 'k2' of p2
const op = require('/MarkLogic/optic');
const p1 = op.fromLiterals([
{'r1':1, 'k1':'a'},
{'r1':2, 'k1':'b'}
]);
const p2 = op.fromLiterals([
{'r2':3, 'k2':'a'},
{'r2':4, 'k2':'c'}
]);
p1.existsJoin(p2, op.on('k1', 'k2')).result();