More flexible dataset matching based on attributes #187
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I recently ran into problems when applying 'nested' postprocessing functions, e.g. merging variables after concatenating members. This happened because the merging step will drop the attr
variable_id
, which the concat wrapper was still expecting.This PR implements an additional step in the general
combine_datasets
function, which checks if a givenmatch_attr
is missing in all datasets, in which case I assume it has been dropped previously and will not use it for the matching.