I'm wondering if there is documentation anywhere about how to use the render_row_cb callback.

The only documentation for it is at the bottom, here: https://github.com/WebDevStudios/CMB2/wiki/Field-Types#render_row_cb

What arguments are passed to it?

It's called here, and gets passed $field_args and the $fieldobject.

And what should it be returning?

Basically, it needs to replace the functionality of the CMB2_Field::render_field_callback method.

If you're render_row_cb looked like the following snippet, it would (in theory) be a direct replacement:

function override_render_field_callback( $field_args, $field ) {
    // If field is requesting to not be shown on the front-end
    if ( ! is_admin() && ! $field->args( 'on_front' ) ) {
        return;
    }
    // If field is requesting to be conditionally shown
    if ( ! $field->should_show() ) {
        return;
    }
    $field->peform_param_callback( 'before_row' );
    printf( "<div class=\"cmb-row %s\">\n", $field->row_classes() );
    if ( ! $field->args( 'show_names' ) ) {
        echo "\n\t<div class=\"cmb-td\">\n";
        $field->peform_param_callback( 'label_cb' );
    } else {
        if ( $field->get_param_callback_result( 'label_cb', false ) ) {
            echo '<div class="cmb-th">', $field->peform_param_callback( 'label_cb' ), '</div>';
        }
        echo "\n\t<div class=\"cmb-td\">\n";
    }
    $field->peform_param_callback( 'before' );
    $field_type = new CMB2_Types( $field );
    $field_type->render();
    $field->peform_param_callback( 'after' );
    echo "\n\t</div>\n</div>";
    $field->peform_param_callback( 'after_row' );
    // For chaining
    return $field;
}

render_row_cb #596

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