Comment 11 for bug 1588561

Reviewed: https://review.openstack.org/521651
Committed: https://git.openstack.org/cgit/openstack/heat/commit/?id=23e06f66b9e0ccb667c24318764da72aa82d4e18
Submitter: Zuul
Branch: master

commit 23e06f66b9e0ccb667c24318764da72aa82d4e18
Author: Zane Bitter <email address hidden>
Date: Mon Nov 20 15:06:13 2017 -0500

    Speed up event listing with nested stacks

    When handling the command "openstack stack event list --nested-depth=n", we
    obtain the list of nested stacks by querying the database for all resources
    that share the root stack ID. However, since all we're getting is the stack
    IDs, there's no need to query all of the fields and construct a versioned
    object for each resource. Just get the set of stack IDs.

    Change-Id: I12155433e2ac1af919aa4b5e780fb965cd5885d8
    Related-Bug: #1588561