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Optimize HostList API: conditional DISTINCT + composite index on JobHostSummary (#16530)

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AAP-81517 — Optimize HostList API: conditional DISTINCT + composite index

Make .distinct() conditional on host_filter being set — without it the
RBAC IN subquery on a direct FK cannot produce duplicates, so DISTINCT
is pure overhead. Add composite index (host_id, id DESC) on
main_jobhostsummary so the with_latest_summary_id() correlated subquery
can use an index-only top-1 scan instead of scanning and sorting.

Co-authored-by: Claude Opus 4.6 <noreply@anthropic.com>
This commit is contained in:
Dirk Julich
2026-07-06 17:01:20 +02:00
committed by GitHub
co-authored by Claude Opus 4.6
parent 72a1922a9c
commit 41545cfcf0
3 changed files with 22 additions and 1 deletions
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awx/api/views/__init__.py
+2 -1
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@@ -1926,7 +1926,8 @@ class HostList(HostRelatedSearchMixin, ListCreateAPIView):
if filter_string:
filter_qs = SmartFilter.query_from_string(filter_string)
qs &= filter_qs
return qs.distinct().with_latest_summary_id()
qs = qs.distinct()
return qs.with_latest_summary_id()
def list(self, *args, **kwargs):
try: