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-rw-r--r--synapse/storage/databases/main/event_federation.py6
-rw-r--r--synapse/storage/databases/main/metrics.py18
-rw-r--r--synapse/storage/databases/main/monthly_active_users.py4
-rw-r--r--synapse/storage/databases/main/registration.py4
-rw-r--r--synapse/storage/databases/main/relations.py2
-rw-r--r--synapse/storage/databases/main/room.py2
-rw-r--r--synapse/storage/databases/main/stats.py2
7 files changed, 18 insertions, 20 deletions
diff --git a/synapse/storage/databases/main/event_federation.py b/synapse/storage/databases/main/event_federation.py
index 2287f1cc68..bc5ff25d08 100644
--- a/synapse/storage/databases/main/event_federation.py
+++ b/synapse/storage/databases/main/event_federation.py
@@ -1393,7 +1393,7 @@ class EventFederationWorkerStore(EventsWorkerStore, SignatureWorkerStore, SQLBas
         count = await self.db_pool.simple_select_one_onecol(
             table="federation_inbound_events_staging",
             keyvalues={"room_id": room_id},
-            retcol="COALESCE(COUNT(*), 0)",
+            retcol="COUNT(*)",
             desc="prune_staged_events_in_room_count",
         )
 
@@ -1485,9 +1485,7 @@ class EventFederationWorkerStore(EventsWorkerStore, SignatureWorkerStore, SQLBas
         """Update the prometheus metrics for the inbound federation staging area."""
 
         def _get_stats_for_federation_staging_txn(txn):
-            txn.execute(
-                "SELECT coalesce(count(*), 0) FROM federation_inbound_events_staging"
-            )
+            txn.execute("SELECT count(*) FROM federation_inbound_events_staging")
             (count,) = txn.fetchone()
 
             txn.execute(
diff --git a/synapse/storage/databases/main/metrics.py b/synapse/storage/databases/main/metrics.py
index 3bb21958d1..1480a0f048 100644
--- a/synapse/storage/databases/main/metrics.py
+++ b/synapse/storage/databases/main/metrics.py
@@ -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
diff --git a/synapse/storage/databases/main/monthly_active_users.py b/synapse/storage/databases/main/monthly_active_users.py
index 65b7e307e1..8f09dd8e87 100644
--- a/synapse/storage/databases/main/monthly_active_users.py
+++ b/synapse/storage/databases/main/monthly_active_users.py
@@ -59,7 +59,7 @@ class MonthlyActiveUsersWorkerStore(SQLBaseStore):
         def _count_users(txn):
             # Exclude app service users
             sql = """
-                SELECT COALESCE(count(*), 0)
+                SELECT COUNT(*)
                 FROM monthly_active_users
                     LEFT JOIN users
                     ON monthly_active_users.user_id=users.name
@@ -86,7 +86,7 @@ class MonthlyActiveUsersWorkerStore(SQLBaseStore):
 
         def _count_users_by_service(txn):
             sql = """
-                SELECT COALESCE(appservice_id, 'native'), COALESCE(count(*), 0)
+                SELECT COALESCE(appservice_id, 'native'), COUNT(*)
                 FROM monthly_active_users
                 LEFT JOIN users ON monthly_active_users.user_id=users.name
                 GROUP BY appservice_id;
diff --git a/synapse/storage/databases/main/registration.py b/synapse/storage/databases/main/registration.py
index 86c3425716..29d9d4de96 100644
--- a/synapse/storage/databases/main/registration.py
+++ b/synapse/storage/databases/main/registration.py
@@ -794,7 +794,7 @@ class RegistrationWorkerStore(CacheInvalidationWorkerStore):
             yesterday = int(self._clock.time()) - (60 * 60 * 24)
 
             sql = """
-                SELECT user_type, COALESCE(count(*), 0) AS count FROM (
+                SELECT user_type, COUNT(*) AS count FROM (
                     SELECT
                     CASE
                         WHEN is_guest=0 AND appservice_id IS NULL THEN 'native'
@@ -819,7 +819,7 @@ class RegistrationWorkerStore(CacheInvalidationWorkerStore):
         def _count_users(txn):
             txn.execute(
                 """
-                SELECT COALESCE(COUNT(*), 0) FROM users
+                SELECT COUNT(*) FROM users
                 WHERE appservice_id IS NULL
             """
             )
diff --git a/synapse/storage/databases/main/relations.py b/synapse/storage/databases/main/relations.py
index 3368a8b084..729ff17e2e 100644
--- a/synapse/storage/databases/main/relations.py
+++ b/synapse/storage/databases/main/relations.py
@@ -390,7 +390,7 @@ class RelationsWorkerStore(SQLBaseStore):
             latest_event_id = row[0]
 
             sql = """
-                SELECT COALESCE(COUNT(event_id), 0)
+                SELECT COUNT(event_id)
                 FROM event_relations
                 INNER JOIN events USING (event_id)
                 WHERE
diff --git a/synapse/storage/databases/main/room.py b/synapse/storage/databases/main/room.py
index 28c4b65bbd..6cf6cc8484 100644
--- a/synapse/storage/databases/main/room.py
+++ b/synapse/storage/databases/main/room.py
@@ -217,7 +217,7 @@ class RoomWorkerStore(SQLBaseStore):
 
             sql = """
                 SELECT
-                    COALESCE(COUNT(*), 0)
+                    COUNT(*)
                 FROM (
                     %(published_sql)s
                 ) published
diff --git a/synapse/storage/databases/main/stats.py b/synapse/storage/databases/main/stats.py
index 9020e0976c..a0472e37f5 100644
--- a/synapse/storage/databases/main/stats.py
+++ b/synapse/storage/databases/main/stats.py
@@ -538,7 +538,7 @@ class StatsStore(StateDeltasStore):
 
             txn.execute(
                 """
-                    SELECT COALESCE(count(*), 0) FROM current_state_events
+                    SELECT COUNT(*) FROM current_state_events
                     WHERE room_id = ?
                 """,
                 (room_id,),