changed type signature to fix auto_type error

diesel/src/pg/expression/functions.rs

@@ -1590,6 +1590,7 @@ define_sql_function! {
     fn to_jsonb<E: MaybeNullableValue<Jsonb>>(e: E) -> E::Out;
 }
 
+#[cfg(feature = "postgres_backend")]
 define_sql_function! {
     /// Builds a JSON object out of a text array. The array must have an even number of members,
     /// in which case they are taken as alternating key/value pairs. This function also has a form that

diesel/src/pg/expression/helper_types.rs

@@ -490,5 +490,5 @@ pub type json_object<A> = super::functions::json_object<SqlTypeOf<A>, A>;
 /// Return type of [`json_object_with_keys_and_values(text_array, text_array)`](super::functions::json_object_with_keys_and_values())
 #[allow(non_camel_case_types)]
 #[cfg(feature = "postgres_backend")]
-pub type json_object_with_keys_and_values<A> =
-    super::functions::json_object_with_keys_and_values<SqlTypeOf<A>, A, A>;
+pub type json_object_with_keys_and_values<K, V> =
+    super::functions::json_object_with_keys_and_values<SqlTypeOf<K>, K, V>;

diesel_derives/tests/auto_type.rs

@@ -438,7 +438,7 @@ fn postgres_functions() -> _ {
         to_json(pg_extras::id),
         to_jsonb(pg_extras::id),
         json_object(pg_extras::text_array),
-        json_object_with_keys_and_values(pg_extras::text_array),
+        json_object_with_keys_and_values(pg_extras::text_array, pg_extras::text_array),
     )
 }