update /api/meta/table/:id/query_metadata to hydrate :target for all of the table :fields.

src/metabase/api/meta/table.clj

@@ -36,7 +36,7 @@
 
 (defendpoint GET "/:id/query_metadata" [id]
   (->404 (sel :one Table :id id)
-         (hydrate :db :fields)))
+         (hydrate :db [:fields [:target]])))
 
 (defendpoint GET "/:id/fks" [id]
   (read-check Table id)

test/metabase/api/meta/table_test.clj

@@ -107,6 +107,7 @@
                    :id $
                    :field_type "info"
                    :position 0
+                   :target nil
                    :preview_display true
                    :created_at $
                    :base_type "TextField"})
@@ -120,6 +121,7 @@
                    :id $
                    :field_type "info"
                    :position 0
+                   :target nil
                    :preview_display true
                    :created_at $
                    :base_type "BigIntegerField"})]