Azat Khuzhin 8830f0608d Support BACKUP to S3 with as-is path/data structure ... Right now backup to S3 does not make a lot of sense, since: - it has random names, and to decoding them - requires metadata from local disk (/var/lib/disks/DISK/BACKUP_NAME) - or send_metadata (but it is also tricky even with it) So this patch adds simpler interface for S3, it is only suitable for BACKUP/RESTORE, so don't try to use it for MergeTree engine. It is done by adding separate disk - `s3_plain` for this, that: - does not support any extended features, like renames/hardlinks/attrs/... (so basically everything that MergeTree requires) - only write/read/unlink/list files Signed-off-by: Azat Khuzhin <a.khuzhin@semrush.com>		2022-10-14 12:59:25 +02:00
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