REMOVEME: Point to wip diesel branch

Author: momobel

Cargo.toml

@@ -63,4 +63,4 @@ members = [
 ]
 
 [patch.crates-io]
-diesel = { git = "http://github.com/diesel-rs/diesel", rev = "793de72" }
+diesel = { git = "http://github.com/wattsense/diesel", "branch" = "optimize_owned_row"}

src/sync_connection_wrapper.rs

@@ -125,7 +125,9 @@ where
     {
         self.execute_with_prepared_query(source.as_query(), |conn, query| {
             use diesel::row::IntoOwnedRow;
-            let mut cache = None;
+            let mut cache = <<<C as LoadConnection>::Row<'_, '_> as IntoOwnedRow<
+                <C as Connection>::Backend,
+            >>::Cache as Default>::default();
             conn.load(&query).map(|c| {
                 c.map(|row| row.map(|r| IntoOwnedRow::into_owned(r, &mut cache)))
                     .collect::<Vec<QueryResult<O>>>()