"LIST" (default value) |
The list is used as a grouping key entirely. For example, one group for
["a", "b"], another for one ["a", "c"],
etc. |
"EACH_ELEMENT" |
Each item of the list is used as a grouping key separately. For example, an
element with ["a", "b", "c"] would appear in 3 partitions:
"a", "b", and "c". |
"EACH_SUBLIST" |
Each prefix sublist of the list is used as a grouping key separately. For
example, an element with ["a", "b", "c"] would appear in 3
partitions: ["a"], ["a", "b"], and ["a",
"b", "c"] |