[startup optimization] IndexStore: Check if table is empty faster (#…

…11718) (cherry picked from commit 6c67767)
WalletWasabi · Nov 28, 2023 · 7ce372d · 7ce372d
1 parent 9a598ed
commit 7ce372d
Showing 1 changed file with 3 additions and 3 deletions.
diff --git a/WalletWasabi/Stores/BlockFilterSqliteStorage.cs b/WalletWasabi/Stores/BlockFilterSqliteStorage.cs
@@ -81,10 +81,10 @@ public static BlockFilterSqliteStorage FromFile(string dataSource, FilterModel?
 			if (startingFilter is not null)
 			{
 				using SqliteCommand isEmptyCommand = connection.CreateCommand();
-				isEmptyCommand.CommandText = "SELECT COUNT(*) FROM filter";
-				int count = Convert.ToInt32(isEmptyCommand.ExecuteScalar());
+				isEmptyCommand.CommandText = "SELECT EXISTS (SELECT 1 FROM filter)";
+				int existRows = Convert.ToInt32(isEmptyCommand.ExecuteScalar());
 
-				if (count == 0)
+				if (existRows == 0)
 				{
 					if (!storage.TryAppend(startingFilter))
 					{