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hint psql planner to do proper index scan

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Fixes: https://pagure.io/koji/issue/2383
This commit is contained in:
Tomas Kopecek 2020-07-27 13:31:13 +02:00
parent c05ff8b107
commit 45224e5b52
1 changed files with 6 additions and 0 deletions
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6
hub/kojihub.py
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@ -7967,6 +7967,9 @@ def build_references(build_id, limit=None, lazy=False):
# find timestamp of most recent use in a buildroot
event_id = 0
if build_rpm_ids:
# psql planner gots confused if buildroot table is large (>trillion)
# and len(rpm_ids) > ~500. In such case it switched to looped sequential scans
_dml("SET enable_hashjoin=off", {})
q = """SELECT MAX(create_event)
FROM standard_buildroot
WHERE buildroot_id IN (
@ -7975,7 +7978,9 @@ def build_references(build_id, limit=None, lazy=False):
WHERE rpm_id IN %(rpm_ids)s
)"""
event_id = (_fetchSingle(q, {'rpm_ids': build_rpm_ids}) or (0,))[0] or 0
_dml("SET enable_hashjoin=on", {})
if build_archive_ids:
_dml("SET enable_hashjoin=off", {})
q = """SELECT MAX(create_event)
FROM standard_buildroot
WHERE buildroot_id IN (
@ -7984,6 +7989,7 @@ def build_references(build_id, limit=None, lazy=False):
WHERE archive_id IN %(archive_ids)s
)"""
event_id2 = (_fetchSingle(q, {'archive_ids': build_archive_ids}) or (0,))[0] or 0
_dml("SET enable_hashjoin=on", {})
event_id = max(event_id, event_id2)
if event_id:
q = """SELECT EXTRACT(EPOCH FROM get_event_time(%(event_id)i))"""