Refactor Find::getCommandDocument

Remove private function createCommandDocument introduced by c7b2b03 and used only for the explain command.

Author: GromNaN

src/Operation/Find.php

@@ -329,21 +329,6 @@ public function execute(Server $server)
      * @return array
      */
     public function getCommandDocument()
-    {
-        $cmd = $this->createCommandDocument();
-
-        // Read concern can change the query plan
-        if (isset($this->options['readConcern'])) {
-            $cmd['readConcern'] = $this->options['readConcern'];
-        }
-
-        return $cmd;
-    }
-
-    /**
-     * Construct a command document for Find
-     */
-    private function createCommandDocument(): array
     {
         $cmd = ['find' => $this->collectionName, 'filter' => (object) $this->filter];
 
@@ -353,6 +338,11 @@ private function createCommandDocument(): array
             return $cmd;
         }
 
+        // Read concern can change the query plan
+        if (isset($this->options['readConcern'])) {
+            $cmd['readConcern'] = $this->options['readConcern'];
+        }
+
         // maxAwaitTimeMS is a Query level option so should not be considered here
         unset($options['maxAwaitTimeMS']);