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c5ed6b22ae
Add a `CHILD_SHARDS` filter to `DescribeStream` command. When used, user need to pass a parent stream shard id as json's ShardFilter.ShardId field. DescribeStream will then return only list of stream shards, that are direct descendants of passed parent stream shard. Each stream shard cover a consecutive part of token space. A stream shard Q is considered to be a child of stream shard W, when at least one token belongs to token spaces from both streams. The filtering algorithm itself is somewhat complicated - more details in comments in streams.cc. CHILD_SHARDS is a Amazon's functionality and is required by KCL. Add unit tests. Fixes: #25160 Closes scylladb/scylladb#28189