diff --git a/synapse/storage/event_federation.py b/synapse/storage/event_federation.py
index f5e8c39262..47cc10d32a 100644
--- a/synapse/storage/event_federation.py
+++ b/synapse/storage/event_federation.py
@@ -25,7 +25,7 @@ from twisted.internet import defer
from synapse.api.errors import StoreError
from synapse.metrics.background_process_metrics import run_as_background_process
-from synapse.storage._base import SQLBaseStore
+from synapse.storage._base import SQLBaseStore, make_in_list_sql_clause
from synapse.storage.events_worker import EventsWorkerStore
from synapse.storage.signatures import SignatureWorkerStore
from synapse.util.caches.descriptors import cached
@@ -68,7 +68,7 @@ class EventFederationWorkerStore(EventsWorkerStore, SignatureWorkerStore, SQLBas
else:
results = set()
- base_sql = "SELECT auth_id FROM event_auth WHERE event_id IN (%s)"
+ base_sql = "SELECT auth_id FROM event_auth WHERE "
front = set(event_ids)
while front:
@@ -76,7 +76,10 @@ class EventFederationWorkerStore(EventsWorkerStore, SignatureWorkerStore, SQLBas
front_list = list(front)
chunks = [front_list[x : x + 100] for x in range(0, len(front), 100)]
for chunk in chunks:
- txn.execute(base_sql % (",".join(["?"] * len(chunk)),), chunk)
+ clause, args = make_in_list_sql_clause(
+ txn.database_engine, "event_id", chunk
+ )
+ txn.execute(base_sql + clause, list(args))
new_front.update([r[0] for r in txn])
new_front -= results
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