MongoDB Query Language (MQL) Object Expression Operators
$mergeObjects
Combines multiple documents into a single document, merging fields from the input documents with later documents overriding fields from earlier documents.
$objectToArray
Converts an object to an array of key-value pairs, where each element is a document with 'k' (key) and 'v' (value) fields.
$setField
Adds, updates, or removes fields in a document, allowing dynamic field manipulation with support for computed field names and conditional operations.