impl/memory: Make queries self-validate

impl/memory/datastore_index.go

 // Copyright 2015 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 package memory
 
 import (
         "bytes"
         "fmt"
         "sort"
@@ skipping 147 matching lines @@
         buf indexRowGen
 }
 
 // matcher.match checks to see if the mapped, serialized property values
 // match the index. If they do, it returns a indexRowGen. Do not write or modify
 // the data in the indexRowGen.
 func (m *matcher) match(idx *ds.IndexDefinition, sip serializedIndexablePmap) (indexRowGen, bool) {
         m.buf.propVec = m.buf.propVec[:0]
         m.buf.orders = m.buf.orders[:0]
         for _, sb := range idx.SortBy {
+                if sb.Property == "__key__" {
+                        panic("don't know how to build compound index on __key__")
+                }
                 if pv, ok := sip[sb.Property]; ok {
                         m.buf.propVec = append(m.buf.propVec, pv)
                         m.buf.orders = append(m.buf.orders, sb.Direction)
                 } else {
                         return indexRowGen{}, false
                 }
         }
         return m.buf, true
 }
 
@@ skipping 134 matching lines @@
 }
 
 func updateIndicies(store *memStore, key ds.Key, oldEnt, newEnt ds.PropertyMap) {
         // load all current complex query index definitions.
         compIdx := getCompIdxs(getIdxColl(store))
 
         mergeIndexes(key.Namespace(), store,
                 indexEntriesWithBuiltins(key, oldEnt, compIdx),
                 indexEntriesWithBuiltins(key, newEnt, compIdx))
 }