Update upstream source from tag 'upstream/3.4.14'

Update to upstream version '3.4.14'
with Debian dir 8c079cd0bdbb1831aa5b89a3b7d4c1b4a1b891a2

1 files changed, 7 insertions, 0 deletions

diff --git a/src/mongo/db/ops/modifier_compare.cpp b/src/mongo/db/ops/modifier_compare.cpp
index 4e366f90ee2..7db7abd09ca 100644
--- a/src/mongo/db/ops/modifier_compare.cpp
+++ b/src/mongo/db/ops/modifier_compare.cpp
@@ -110,6 +110,8 @@ Status ModifierCompare::prepare(mutablebson::Element root,
     // be created during the apply.
     Status status = pathsupport::findLongestPrefix(
         _updatePath, root, &_preparedState->idxFound, &_preparedState->elemFound);
+    const auto elemFoundIsArray =
+        _preparedState->elemFound.ok() && _preparedState->elemFound.getType() == BSONType::Array;
 
     // FindLongestPrefix may say the path does not exist at all, which is fine here, or
     // that the path was not viable or otherwise wrong, in which case, the mod cannot
@@ -128,6 +130,11 @@ Status ModifierCompare::prepare(mutablebson::Element root,
                              _preparedState->idxFound == (_updatePath.numParts() - 1));
     if (!destExists) {
         execInfo->noOp = false;
+
+        if (elemFoundIsArray) {
+            // Report that an existing array will gain a new element as a result of this mod.
+            execInfo->indexOfArrayWithNewElement[0] = _preparedState->idxFound;
+        }
     } else {
         const int compareVal =
             _preparedState->elemFound.compareWithBSONElement(_val, _collator, false);