fix serialization of oidvector

postgres-types/src/lib.rs

@@ -910,9 +910,15 @@ impl<'a, T: ToSql> ToSql for &'a [T] {
             _ => panic!("expected array type"),
         };
 
+        // Arrays are normally one indexed by default but oidvector *requires* zero indexing
+        let lower_bound = match *ty {
+            Type::OID_VECTOR => 0,
+            _ => 1,
+        };
+
         let dimension = ArrayDimension {
             len: downcast(self.len())?,
-            lower_bound: 1,
+            lower_bound,
         };
 
         types::array_to_sql(

tokio-postgres/src/connect_socket.rs

@@ -14,7 +14,9 @@ pub(crate) async fn connect_socket(
     host: &Host,
     port: u16,
     connect_timeout: Option<Duration>,
-    tcp_user_timeout: Option<Duration>,
+    #[cfg_attr(not(target_os = "linux"), allow(unused_variables))] tcp_user_timeout: Option<
+        Duration,
+    >,
     keepalive_config: Option<&KeepaliveConfig>,
 ) -> Result<Socket, Error> {
     match host {

tokio-postgres/tests/test/types/mod.rs

@@ -739,3 +739,14 @@ async fn ltxtquery_any() {
     )
     .await;
 }
+
+#[tokio::test]
+async fn oidvector() {
+    test_type(
+        "oidvector",
+        // NB: postgres does not support empty oidarrays! All empty arrays are normalized to zero dimensions, but the
+        // oidvectorrecv function requires exactly one dimension.
+        &[(Some(vec![0u32, 1, 2]), "ARRAY[0,1,2]"), (None, "NULL")],
+    )
+    .await;
+}