Filter the content of sstable(s), including or excluding the specified
partitions. Partitions can be provided on the command line via
`--partition`, or in a file via `--partitions-file`.
Produces one output sstable per input sstable -- if the filter selects
at least one partition in the respective input sstable.
Output sstables are placed in the path provided via `--oputput-dir`.
Use `--merge` to filter all input sstables combined, producing one
output sstable.
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