This $comment_clause local variable is declared but never used.
diff --git a/system/database/drivers/pdo/subdrivers/pdo_mysql_forge.php b/system/database/drivers/pdo/subdrivers/pdo_mysql_forge.php
index c90712a..e8e24c6 100644
--- a/system/database/drivers/pdo/subdrivers/pdo_mysql_forge.php
+++ b/system/database/drivers/pdo/subdrivers/pdo_mysql_forge.php
@@ -199,8 +199,6 @@
$extra_clause = ' FIRST';
}
- $comment_clause = isset($field['comment']) ? ' COMMENT ' . $field['comment'] : '';
-
return $this->db->escape_identifiers($field['name'])
.(empty($field['new_name']) ? '' : ' '.$this->db->escape_identifiers($field['new_name']))
.' '.$field['type'].$field['length']