From c1007834f6c7d724e824a91c60ab1e2aef2e07c9 Mon Sep 17 00:00:00 2001
From: Eliot Horowitz <eliot@10gen.com>
Date: Wed, 5 May 2010 22:52:51 -0400
Subject: fix updates on indexes fields when using array offsets SERVER-1093

---
 db/update.h           | 48 ++++++++++++++++++++++++++++++++++++++++++++++--
 jstests/index_arr2.js | 51 +++++++++++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 97 insertions(+), 2 deletions(-)
 create mode 100644 jstests/index_arr2.js

diff --git a/db/update.h b/db/update.h
index 5d20114fe97..3c4daabaeae 100644
--- a/db/update.h
+++ b/db/update.h
@@ -100,12 +100,13 @@ namespace mongo {
             }
         }
         
-        bool isIndexed( const set<string>& idxKeys ) const {
+        static bool isIndexed( const string& fullName , const set<string>& idxKeys ){
+            const char * fieldName = fullName.c_str();
             // check if there is an index key that is a parent of mod
             for( const char *dot = strchr( fieldName, '.' ); dot; dot = strchr( dot + 1, '.' ) )
                 if ( idxKeys.count( string( fieldName, dot - fieldName ) ) )
                     return true;
-            string fullName = fieldName;
+
             // check if there is an index key equal to mod
             if ( idxKeys.count(fullName) )
                 return true;
@@ -113,6 +114,49 @@ namespace mongo {
             set< string >::const_iterator j = idxKeys.upper_bound( fullName );
             if ( j != idxKeys.end() && j->find( fullName ) == 0 && (*j)[fullName.size()] == '.' )
                 return true;
+
+            return false;
+        }
+        
+        bool isIndexed( const set<string>& idxKeys ) const {
+            string fullName = fieldName;
+            
+            if ( isIndexed( fullName , idxKeys ) )
+                return true;
+            
+            if ( strstr( fieldName , "." ) ){
+                // check for a.0.1
+                StringBuilder buf( fullName.size() + 1 );
+                for ( size_t i=0; i<fullName.size(); i++ ){
+                    char c = fullName[i];
+                    buf << c;
+
+                    if ( c != '.' )
+                        continue;
+
+                    if ( ! isdigit( fullName[i+1] ) )
+                        continue;
+                    
+                    bool possible = true;
+                    size_t j=i+2;
+                    for ( ; j<fullName.size(); j++ ){
+                        char d = fullName[j];
+                        if ( d == '.' )
+                            break;
+                        if ( isdigit( d ) )
+                            continue;
+                        possible = false;
+                        break;
+                    }
+                    
+                    if ( possible )
+                        i = j;
+                }
+                string x = buf.str();
+                if ( isIndexed( x , idxKeys ) )
+                    return true;
+            }
+
             return false;
         }
         
diff --git a/jstests/index_arr2.js b/jstests/index_arr2.js
new file mode 100644
index 00000000000..21a511b8485
--- /dev/null
+++ b/jstests/index_arr2.js
@@ -0,0 +1,51 @@
+NUM = 20;
+M = 5;
+
+t = db.xxx;
+
+function test( withIndex ){
+    t.drop();
+    
+    // insert a bunch of items to force queries to use the index.
+    newObject = {
+        _id : 1,
+        a : [
+            { b : { c : 1 }  }
+        ]
+    }
+    
+    now = (new Date()).getTime() / 1000;
+    for (created = now - NUM; created <= now; created++ ) {
+        newObject['created'] = created;
+        t.insert(newObject);
+        newObject['_id'] ++;
+    }
+    
+    // change the last M items.
+    query = {
+        'created' : { '$gte' : now - M }
+    }
+    
+    Z = t.find( query ).count();
+    
+    if ( withIndex ){
+        //t.ensureIndex( { 'a.b.c' : 1, 'created' : -1 } )
+        //t.ensureIndex( { created : -1 } )
+        t.ensureIndex( { 'a.b.c' : 1 } , { name : "x" } )
+    }
+    
+    t.update(query, { '$set' : { "a.0.b.c" : 0 } } , false , true )
+    assert.eq( Z , db.getLastErrorObj().n , "num updated withIndex:" + withIndex );
+    
+    // now see how many were actually updated.
+    query['a.b.c'] = 0;
+    
+    count = t.count(query);
+
+    assert.eq( Z , count , "count after withIndex:" + withIndex );
+}
+
+test( false )
+test( true );
+
+
-- 
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