Implement YAQL function 'task' returning info about a task (including result)

Registered by Renat Akhmerov

We need to implement new YAQL function 'task' that will be returning info about specified task, including task result. This will substitute the current mechanism of addressing task result using $.task_name YAQL expression which is confusing and, in many ways, buggy.

Blueprint information

Status:
Complete
Approver:
Renat Akhmerov
Priority:
High
Drafter:
Renat Akhmerov
Direction:
Approved
Assignee:
Renat Akhmerov
Definition:
Approved
Series goal:
Accepted for liberty
Implementation:
Implemented
Milestone target:
milestone icon 1.0.0
Started by
Renat Akhmerov
Completed by
Renat Akhmerov

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Gerrit topic: https://review.openstack.org/#q,topic:bp/mistral-task-yaql-function,n,z

Addressed by: https://review.openstack.org/221289
    Add YAQL function 'task' to extract info about task in DSL

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