Merge a set of rows with non-unique values in a given set of columns.
Data frame on which merging is performed.
The column indexes which should contain the unique set of values after merging.
Collapse the rows that have the same values in for a given set of columns into a single row, merging the rest of the values into the list of unique values separated by comma, one list per column.
Data frame conaining the unique set of values in matchInds column set.
Alex Lisovich, Roger Day
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