quick cursor fix

Author: HanaPearlman

src/cmap/wire_protocol/query.ts

@@ -7,6 +7,7 @@ import { Document, pluckBSONSerializeOptions } from '../../bson';
 import type { Server } from '../../sdam/server';
 import type { ReadPreferenceLike } from '../../read_preference';
 import type { FindOptions } from '../../operations/find';
+import { Explain } from '../../explain';
 
 /** @internal */
 export interface QueryOptions extends CommandOptions {
@@ -62,7 +63,7 @@ export function query(
 }
 
 function prepareFindCommand(server: Server, ns: string, cmd: Document) {
-  let findCmd: Document = {
+  const findCmd: Document = {
     find: collectionNamespace(ns)
   };
 
@@ -146,12 +147,9 @@ function prepareFindCommand(server: Server, ns: string, cmd: Document) {
   if (cmd.collation) findCmd.collation = cmd.collation;
   if (cmd.readConcern) findCmd.readConcern = cmd.readConcern;
 
-  // If we have explain, we need to rewrite the find command
-  // to wrap it in the explain command
-  if (cmd.explain) {
-    findCmd = {
-      explain: findCmd
-    };
+  // TODO: Quick fix to make tests pass; will be updated during NODE-2853
+  if (cmd.explain !== undefined) {
+    findCmd.explain = Explain.fromOptions({ explain: cmd.explain });
   }
 
   return findCmd;