JSqlParser will throw exception when udf function is not defined

Question

I am using JSqlParser to do some simple table name modification, but it will throw exception when I use some udf functions in statements. How to make it ignore function check?

def replaceTableName(sql: String) = {
  val select = CCJSqlParserUtil.parse(sql).asInstanceOf[Select]

  val buffer = new java.lang.StringBuilder()
  val expressionDeParser = new ExpressionDeParser() {
    override def visit(tableColumn: Column) = {
      if (tableColumn.getTable.getName != null && tmpTables.contains(resolveName(tableColumn.getTable.getName))) {
        tableColumn.getTable().setName(resolveName(tableColumn.getTable().getName()))
      }
      super.visit(tableColumn)
    }

  }
  val deparser = new SelectDeParser(expressionDeParser, buffer) {
    override def visit(tableName: Table) {
      if(tmpTables.contains(resolveName(tableName.getName)))
        tableName.setName(resolveName(tableName.getName()))
      super.visit(tableName)
    }
  }
  expressionDeParser.setSelectVisitor(deparser)
  expressionDeParser.setBuffer(buffer)
  select.getSelectBody().accept(deparser)
  buffer.toString
}

This code will throw

Caused by: net.sf.jsqlparser.parser.ParseException: Encountered unexpected token: "current_date" <K_TIME_KEY_EXPR> at line 1, column xx

If my input is select * from table where date = sub_date(current_date('yyyyMMdd'),'1','yyyyMMdd');
sub_date and current_date are my udfs to get yesterday's date.