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system/Database/MySQLi/Builder.php

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+<?php
+
+/**
+ * This file is part of CodeIgniter 4 framework.
+ *
+ * (c) CodeIgniter Foundation <admin@codeigniter.com>
+ *
+ * For the full copyright and license information, please view
+ * the LICENSE file that was distributed with this source code.
+ */
+
+namespace CodeIgniter\Database\MySQLi;
+
+use CodeIgniter\Database\BaseBuilder;
+
+/**
+ * Builder for MySQLi
+ */
+class Builder extends BaseBuilder
+{
+    /**
+     * Identifier escape character
+     *
+     * @var string
+     */
+    protected $escapeChar = '`';
+
+    /**
+     * Specifies which sql statements
+     * support the ignore option.
+     *
+     * @var array
+     */
+    protected $supportedIgnoreStatements = [
+        'update' => 'IGNORE',
+        'insert' => 'IGNORE',
+        'delete' => 'IGNORE',
+    ];
+
+    /**
+     * FROM tables
+     *
+     * Groups tables in FROM clauses if needed, so there is no confusion
+     * about operator precedence.
+     *
+     * Note: This is only used (and overridden) by MySQL.
+     */
+    protected function _fromTables(): string
+    {
+        if (! empty($this->QBJoin) && count($this->QBFrom) > 1) {
+            return '(' . implode(', ', $this->QBFrom) . ')';
+        }
+
+        return implode(', ', $this->QBFrom);
+    }
+}