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113647550f
Any empty object of the json::json_list type has its internal _set variable assigned to false which results in such objects being skipped by the json::json_builder. Hence, the json returned by the api GET//compaction_manager/compaction_history does not contain the field `rows_merged` if a cell in the system.compaction_history table is null or an empty list. In such cases, executing the command `nodetool compactionhistory` will result in a crash with the following error message: `error running operation: rjson::error (JSON assert failed on condition 'false'` The patch fixes it by checking if the json object contains the `rows_merged` element before processing. If the element does not exist, the nodetool will now produce an empty list. Fixes https://github.com/scylladb/scylladb/issues/23540 Closes scylladb/scylladb#23514