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Remove redundant COALESCE()s around COUNT()s in database queries (#11570)

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`COUNT()` never returns `NULL`. A `COUNT(*)` over 0 rows is 0 and a
`COUNT(NULL)` is also 0.
This commit is contained in:
Sean Quah 2021-12-14 12:34:30 +00:00 • committed by GitHub
parent 33abbc3278
commit a4dce5b53d
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9 changed files with 20 additions and 21 deletions
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18
synapse/storage/databases/main/metrics.py
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@ -105,7 +105,7 @@ class ServerMetricsStore(EventPushActionsWorkerStore, SQLBaseStore):
def _count_messages(txn):
sql = """
SELECT COALESCE(COUNT(*), 0) FROM events
SELECT COUNT(*) FROM events
WHERE type = 'm.room.encrypted'
AND stream_ordering > ?
"""
@ -122,7 +122,7 @@ class ServerMetricsStore(EventPushActionsWorkerStore, SQLBaseStore):
like_clause = "%:" + self.hs.hostname
sql = """
SELECT COALESCE(COUNT(*), 0) FROM events
SELECT COUNT(*) FROM events
WHERE type = 'm.room.encrypted'
AND sender LIKE ?
AND stream_ordering > ?
@ -139,7 +139,7 @@ class ServerMetricsStore(EventPushActionsWorkerStore, SQLBaseStore):
async def count_daily_active_e2ee_rooms(self):
def _count(txn):
sql = """
SELECT COALESCE(COUNT(DISTINCT room_id), 0) FROM events
SELECT COUNT(DISTINCT room_id) FROM events
WHERE type = 'm.room.encrypted'
AND stream_ordering > ?
"""
@ -161,7 +161,7 @@ class ServerMetricsStore(EventPushActionsWorkerStore, SQLBaseStore):
def _count_messages(txn):
sql = """
SELECT COALESCE(COUNT(*), 0) FROM events
SELECT COUNT(*) FROM events
WHERE type = 'm.room.message'
AND stream_ordering > ?
"""
@ -178,7 +178,7 @@ class ServerMetricsStore(EventPushActionsWorkerStore, SQLBaseStore):
like_clause = "%:" + self.hs.hostname
sql = """
SELECT COALESCE(COUNT(*), 0) FROM events
SELECT COUNT(*) FROM events
WHERE type = 'm.room.message'
AND sender LIKE ?
AND stream_ordering > ?
@ -195,7 +195,7 @@ class ServerMetricsStore(EventPushActionsWorkerStore, SQLBaseStore):
async def count_daily_active_rooms(self):
def _count(txn):
sql = """
SELECT COALESCE(COUNT(DISTINCT room_id), 0) FROM events
SELECT COUNT(DISTINCT room_id) FROM events
WHERE type = 'm.room.message'
AND stream_ordering > ?
"""
@ -231,7 +231,7 @@ class ServerMetricsStore(EventPushActionsWorkerStore, SQLBaseStore):
Returns number of users seen in the past time_from period
"""
sql = """
SELECT COALESCE(count(*), 0) FROM (
SELECT COUNT(*) FROM (
SELECT user_id FROM user_ips
WHERE last_seen > ?
GROUP BY user_id
@ -258,7 +258,7 @@ class ServerMetricsStore(EventPushActionsWorkerStore, SQLBaseStore):
thirty_days_ago_in_secs = now - thirty_days_in_secs
sql = """
SELECT platform, COALESCE(count(*), 0) FROM (
SELECT platform, COUNT(*) FROM (
SELECT
users.name, platform, users.creation_ts * 1000,
MAX(uip.last_seen)
@ -296,7 +296,7 @@ class ServerMetricsStore(EventPushActionsWorkerStore, SQLBaseStore):
results[row[0]] = row[1]
sql = """
SELECT COALESCE(count(*), 0) FROM (
SELECT COUNT(*) FROM (
SELECT users.name, users.creation_ts * 1000,
MAX(uip.last_seen)
FROM users