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Add facet by blank per column in All menu #2220
Is your feature request related to a problem or area of OpenRefine? Please describe.
it can be useful to find all the columns with no value. We can use a facet with this formula filter(row.columnNames,cn,isBlank(cells[cn].value)), then sort by count to find the columns filled with blank values (for which the count will be the same as the total row of the dataset).
This facet could be prebuild on the same basis as #1977
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