+ [misc] add trimExpr.

lib/sqlparser/sqlparser.class.php

@@ -152,7 +152,7 @@ class sqlparser
         {
             if($column === '*')
             {
-                $table = trim(trim($table), '`');
+                $table = $this->trimExpr($table);
                 $expression->expr = empty($table) ? '*' : "`$table`.*";
             }
             else
@@ -181,6 +181,18 @@ class sqlparser
         return $this->combineMultipleTable();
     }
 
+    /**
+     * Trim expr.
+     *
+     * @param  string    $expr
+     * @access private
+     * @return string
+     */
+    private function trimExpr($expr)
+    {
+        return trim(trim($expr), '`');
+    }
+
     /**
      * Combine single table to columns.
      *