SERVER-12129 meta projection operator should overwrite fields

1 files changed, 23 insertions, 2 deletions

diff --git a/jstests/fts_projection.js b/jstests/fts_projection.js
index 2ee915e1585..eb1e26ab4ed 100644
--- a/jstests/fts_projection.js
+++ b/jstests/fts_projection.js
@@ -6,7 +6,7 @@ t.drop();
 db.adminCommand({setParameter: 1, newQueryFrameworkEnabled: true});
 
 t.insert({_id: 0, a: "textual content"});
-t.insert({_id: 1, a: "additional content"});
+t.insert({_id: 1, a: "additional content", b: -1});
 t.insert({_id: 2, a: "irrelevant content"});
 t.ensureIndex({a:"text"});
 
@@ -18,12 +18,23 @@ assert.eq(results.length, 2);
 assert(results[0].score);
 assert(results[1].score);
 
+// indexed by _id.
+var scores = [0, 0, 0];
+scores[results[0]._id] = results[0].score;
+scores[results[1]._id] = results[1].score;
+
 //
 // Edge/error cases:
 //
 
 // Project text score into 2 fields.
 results = t.find({$text: {$search: "textual content -irrelevant"}}, {otherScore: {$meta: "textScore"}, score:{$meta: "textScore"}}).toArray();
+assert.eq(2, results.length);
+for (var i = 0; i < results.length; ++i) {
+    assert.close(scores[results[i]._id], results[i].score);
+    assert.close(scores[results[i]._id], results[i].otherScore);
+}
+
 // printjson(results);
 
 // Project text score into "x.$" shouldn't crash
@@ -31,7 +42,17 @@ assert.throws(function() { t.find({$text: {$search: "textual content -irrelevant
 
 // TODO: We can't project 'x.y':1 and 'x':1 (yet).
 
-// TODO: Clobber an existing field and behave nicely.
+// Clobber an existing field and behave nicely.
+results = t.find({$text: {$search: "textual content -irrelevant"}},
+                 {b: {$meta: "textScore"}}).toArray();
+assert.eq(2, results.length);
+for (var i = 0; i < results.length; ++i) {
+    assert.close(scores[results[i]._id], results[i].b,
+                 i + ': existing field in ' + tojson(results[i], '', true) +
+                 ' is not clobbered with score');
+}
+
+assert.neq(-1, results[0].b);
 
 // Don't crash if we have no text score.
 var results = t.find({a: /text/}, {score: {$meta: "textScore"}}).toArray();