neutron/fetch-specific-column-in-ovo-69c0b087c8c7ee36.yaml at b53c5e734018bd6f0c23330509b1ea0ab18a8f5c - neutron - OpenDev: Free Software Needs Free Tools

openstack/neutron

Hongbin Lu f24f422373 Support fetching specific db column in OVO

There is a analysis [1] suggested to run queries against specific
columns rather than full ORM entities to optimize the performance.
Right now, it is impossible to execute such optimization because
OVO doesn't support fetching specific column yet.

This commit introduces a new method 'get_values' in the base
neutron object class. Subclass of neutron object can leverage
this method to fetch specific field of a OVO. It supports fetching
non-synthetic fields only as syntheic fields are not directly backed
by corresponding DB table columns.

neutron-lib patch: https://review.openstack.org/#/c/619047/

[1] https://review.openstack.org/#/c/592361/

Needed-By: https://review.openstack.org/#/c/610184/

Change-Id: Ib90eae7738a5d2e4548fe9fed001d6cdaffddf3b
Partial-Implements: blueprint adopt-oslo-versioned-objects-for-db

2018-12-11 19:29:28 +00:00

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   - |
     Support fetching specific db column in OVO.
     A new method ``get_values`` is added to neutron object classes.
     This method can be leveraged to fetch specific field of the object.