[5.5] Remove "select" bindings from MySQL delete statments. (#22285)

*        prepare bindings for delete on mysql

* fixes

src/Illuminate/Database/Query/Builder.php

@@ -2224,7 +2224,9 @@ public function delete($id = null)
         }
 
         return $this->connection->delete(
-            $this->grammar->compileDelete($this), $this->getBindings()
+            $this->grammar->compileDelete($this), $this->cleanBindings(
+                $this->grammar->prepareBindingsForDelete($this->bindings)
+            )
         );
     }
 

src/Illuminate/Database/Query/Grammars/Grammar.php

@@ -761,6 +761,17 @@ public function compileDelete(Builder $query)
         return trim("delete from {$this->wrapTable($query->from)} $wheres");
     }
 
+    /**
+     * Prepare the bindings for a delete statement.
+     *
+     * @param  array  $bindings
+     * @return array
+     */
+    public function prepareBindingsForDelete(array $bindings)
+    {
+        return Arr::flatten($bindings);
+    }
+
     /**
      * Compile a truncate table statement into SQL.
      *

src/Illuminate/Database/Query/Grammars/MySqlGrammar.php

@@ -2,6 +2,7 @@
 
 namespace Illuminate\Database\Query\Grammars;
 
+use Illuminate\Support\Arr;
 use Illuminate\Support\Str;
 use Illuminate\Database\Query\Builder;
 use Illuminate\Database\Query\JsonExpression;
@@ -204,6 +205,21 @@ public function compileDelete(Builder $query)
                     : $this->compileDeleteWithoutJoins($query, $table, $where);
     }
 
+    /**
+     * Prepare the bindings for a delete statement.
+     *
+     * @param  array  $bindings
+     * @return array
+     */
+    public function prepareBindingsForDelete(array $bindings)
+    {
+        $cleanBindings = Arr::except($bindings, ['join', 'select']);
+
+        return array_values(
+            array_merge($bindings['join'], Arr::flatten($cleanBindings))
+        );
+    }
+
     /**
      * Compile a delete query that does not use joins.
      *