SERVER-50778 Compare array indexes numerically for updates

1 files changed, 8 insertions, 1 deletions

diff --git a/jstests/core/update_bit_examples.js b/jstests/core/update_bit_examples.js
index 0b8f868ea17..1f1c03596e3 100644
--- a/jstests/core/update_bit_examples.js
+++ b/jstests/core/update_bit_examples.js
@@ -1,7 +1,7 @@
 // Cannot implicitly shard accessed collections because of following errmsg: A single
 // update/delete on a sharded collection must contain an exact match on _id or contain the shard
 // key.
-// @tags: [assumes_unsharded_collection, requires_non_retryable_writes]
+// @tags: [assumes_unsharded_collection, requires_non_retryable_writes, requires_fcv_47]
 
 // Basic examples for $bit
 var res;
@@ -32,3 +32,10 @@ assert.eq(coll.findOne().a, 4);
 // SERVER-19706 Empty bit operation.
 res = coll.update({}, {$bit: {a: {}}});
 assert.writeError(res);
+
+// Make sure $bit on index arrays 9 and 10 when padding is needed works.
+assert.commandWorked(coll.insert({_id: 2, a: [0]}));
+assert.commandWorked(
+    coll.update({_id: 2}, {$bit: {"a.9": {or: NumberInt(0)}, "a.10": {or: NumberInt(0)}}}));
+res = coll.find({_id: 2}).toArray();
+assert.eq(res[0]["a"], [0, null, null, null, null, null, null, null, null, 0, 0]);