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This relies on some changes upstream, notably ...
Make merge dispatchable on pandas/other dataframe types dask/dask#4522
[FEA] Support additional merge keywords left/right_on, indicator, suffixes cudf#1031
for which I have a hacky solution here:
rapidsai/cudf@branch-0.6...mrocklin:merge-keywords-hack
cc @randerzander after the changes above you should be able to use the standard
dask.dataframe.merge
function on dask-cudf dataframes if at least one of them has a single partition.