work around sqlc nullable array value type issue

Author: bgentry

src/riverqueue/driver/riversqlalchemy/dbsqlc/river_job.py

@@ -52,9 +52,9 @@
     -- query.
     string_to_array(unnest(:p9\\:\\:text[]), ','),
 
-    unnest(:p10\\:\\:bytea[]),
+    nullif(unnest(:p10\\:\\:bytea[]), ''),
     -- Strings of bits are used for the input type here to make sqlalchemy play nicely with bit(8)\\:
-    unnest(:p11\\:\\:text[])\\:\\:bit(8)
+    nullif(unnest(:p11\\:\\:text[]), '')\\:\\:bit(8)
 
 ON CONFLICT (unique_key)
     WHERE unique_key IS NOT NULL

src/riverqueue/driver/riversqlalchemy/dbsqlc/river_job.sql

@@ -73,9 +73,9 @@ INSERT INTO river_job(
     -- query.
     string_to_array(unnest(@tags::text[]), ','),
 
-    unnest(@unique_key::bytea[]),
+    nullif(unnest(@unique_key::bytea[]), ''),
     -- Strings of bits are used for the input type here to make sqlalchemy play nicely with bit(8):
-    unnest(@unique_states::text[])::bit(8)
+    nullif(unnest(@unique_states::text[]), '')::bit(8)
 
 ON CONFLICT (unique_key)
     WHERE unique_key IS NOT NULL

src/riverqueue/driver/riversqlalchemy/sql_alchemy_driver.py

@@ -148,14 +148,14 @@ def _build_insert_many_params(
         )
         insert_many_params.state.append(cast(models.RiverJobState, insert_params.state))
         insert_many_params.tags.append(",".join(insert_params.tags))
-        insert_many_params.unique_key.append(insert_params.unique_key or None)
+        insert_many_params.unique_key.append(memoryview(insert_params.unique_key or b""))
 
         if insert_params.unique_states:
             one_byte = insert_params.unique_states[0]
             bit_string = format(one_byte, "08b")
             insert_many_params.unique_states.append(bit_string)
         else:
-            insert_many_params.unique_states.append(None)
+            insert_many_params.unique_states.append("")
 
     return insert_many_params