@Override
    public T map(ResultSet r, StatementContext ctx) throws SQLException {
        return delegate.map(r, ctx);
    }
Constructs a row mapper which maps the column with the given label.
@param mapper the column mapper to delegate to for mapping
@param columnLabel the label of the column to map
core/src/main/java/org/jdbi/v3/core/mapper/SingleColumnMapper.java