chore: update rowset sharding to use split points as start keys #1218
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RowSetUtil has 2 methods to split a RowSet: split and shard. Split is used for ReadRows resumption, so the split needs to be included in the segment. Shard is used for map/reduce style frameworks to parallelize the work. In this case the split points should be treated as start keys (since they usually come from SampleRowKeys and align with the start of a tablet. This PR fixes the shard behavior to use splits as start keys. It introduces some code duplication but overall makes it easier to reason about the 2 behaviors
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RowSetUtil has 2 methods to split a RowSet: split and shard.
Split is used for ReadRows resumption, so the split needs to be included in the segment.
Shard is used for map/reduce style frameworks to parallelize the work. In this case the split points should be treated as start keys (since they usually come from SampleRowKeys and align with the start of a tablet. This PR fixes the shard behavior to use splits as start keys. It introduces some code duplication but overall makes it easier to reason about the 2 behaviors