Illuminate: ready. (critical)

- DB에서 illuminate를 가져올 수 있도록 설정
- 업그레이듵 불가, RootDB, DB를 직접 수정해야함

vendor/illuminate/database/Concerns/ExplainsQueries.php

@@ -0,0 +1,24 @@
+<?php
+
+namespace Illuminate\Database\Concerns;
+
+use Illuminate\Support\Collection;
+
+trait ExplainsQueries
+{
+    /**
+     * Explains the query.
+     *
+     * @return \Illuminate\Support\Collection
+     */
+    public function explain()
+    {
+        $sql = $this->toSql();
+
+        $bindings = $this->getBindings();
+
+        $explanation = $this->getConnection()->select('EXPLAIN '.$sql, $bindings);
+
+        return new Collection($explanation);
+    }
+}