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When stopping the read, the multishard reader will dismantle the compaction state, pushing back (unpopping) the currently processed partition's header to its originating reader. This ensures that if the reader stops in the middle of a partition, on the next page the partition-header is re-emitted as the compactor (and everything downstream from it) expects. It can happen however that there is nothing more for the current partition in the reader and the next fragment is another partition. Since we only push back the partition header (without a partition-end) this can result in two partitions being emitted without being separated by a partition end. We could just add the missing partition-end when needed but it is pointless, if the partition has no more data, just drop the header, we won't need it on the next page. The missing partition-end can generate an "IDL frame truncated" message as it ends up causing the query result writer to create a corrupt partition entry. Fixes: https://github.com/scylladb/scylladb/issues/9482 Closes #11175 * github.com:scylladb/scylladb: test/cql-pytest: add regression test for "IDL frame truncated" error mutation_compactor: detach_state(): make it no-op if partition was exhausted querier: use full_position in shard_mutation_querier