[datastore] Fix querying with []byte.

impl/prod/everything_test.go

 // Copyright 2015 The LUCI Authors.
 //
 // Licensed under the Apache License, Version 2.0 (the "License");
 // you may not use this file except in compliance with the License.
 // You may obtain a copy of the License at
 //
 //      http://www.apache.org/licenses/LICENSE-2.0
 //
 // Unless required by applicable law or agreed to in writing, software
 // distributed under the License is distributed on an "AS IS" BASIS,
@@ skipping 151 matching lines @@
                         Convey("Can query", func() {
                                 q := ds.NewQuery("TestStruct")
                                 ds.Run(ctx, q, func(ts *TestStruct) {
                                         So(*ts, ShouldResemble, orig)
                                 })
                                 count, err := ds.Count(ctx, q)
                                 So(err, ShouldBeNil)
                                 So(count, ShouldEqual, 1)
                         })
 
+                        Convey("Can query for bytes", func() {
+                                q := ds.NewQuery("TestStruct").Eq("ValueBS", []byte("allo"))
+                                ds.Run(ctx, q, func(ts *TestStruct) {
+                                        So(*ts, ShouldResemble, orig)
+                                })
+                                count, err := ds.Count(ctx, q)
+                                So(err, ShouldBeNil)
+                                So(count, ShouldEqual, 1)
+                        })
+
                         Convey("Can project", func() {
                                 q := ds.NewQuery("TestStruct").Project("ValueS")
                                 rslts := []ds.PropertyMap{}
                                 So(ds.GetAll(ctx, q, &rslts), ShouldBeNil)
                                 So(rslts, ShouldResemble, []ds.PropertyMap{
                                         {
                                                 "$key":   mpNI(ds.KeyForObj(ctx, &orig)),
                                                 "ValueS": mp("hello"),
                                         },
                                         {
@@ skipping 145 matching lines @@
                                 default:
                                         return err
                                 }
                         }, &ds.TransactionOptions{Attempts: 9999999})
                         if err != nil {
                                 b.Fatalf("failed to run transaction: %v", err)
                         }
                 }
         })
 }