histogram operation correctly defines group and vdims
histogram operation correctly defines group and vdims

vascotenner/holoviews,mjabri/holoviews,vascotenner/holoviews,basnijholt/holoviews,ioam/holoviews,basnijholt/holoviews,basnijholt/holoviews,ioam/holoviews,ioam/holoviews,mjabri/holoviews,vascotenner/holoviews,mjabri/holoviews