Merge pull request #2302 from pjsde/fix_fromTables

Fix MySql _fromTables()

Author: jim-parry

system/Database/MySQLi/Builder.php

@@ -53,4 +53,24 @@ class Builder extends BaseBuilder
 	 */
 	protected $escapeChar = '`';
 
+	/**
+	 * 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.
+	 *
+	 * @return string
+	 */
+	protected function _fromTables(): string
+	{
+		if ( ! empty($this->QBJoin) && count($this->QBFrom) > 1)
+		{
+			return '('.implode(', ', $this->QBFrom).')';
+		}
+
+		return implode(', ', $this->QBFrom);
+	}
+
 }