ANTLR PlSqlParser VisitOpen_for_statement overload

VisitOpen_for_statement.cs

public override object VisitOpen_for_statement(PlSqlParser.Open_for_statementContext context)
{
    if (context.select_statement() != null)
    {
        Columns.AddRange(GetColumns(context.select_statement()));
    }
    else
    {
        if (context.expression()?.GetText() is var queryVar && !string.IsNullOrEmpty(queryVar) &&
            _assignments.ContainsKey(queryVar))
        {
            Columns.AddRange(GetColumns(Utils.CreatePlSqlParser(_assignments[queryVar])
                .select_statement()));
        }
    }

    return null;
}