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this looks a lot like grafana loki no?
Earlier quoted context omitted.
It was my understanding that those databases do have sparse indexes, but admittedly I may have applied that assumption based on my majority experience with Clickhouse where it uses LSM Tree engines and also has a sparse index. Would it be correct to say this is like an embeddable clickhouse engine, minus the SQL interface and using Arrow and Parquet as the storage format?
Yes, that's correct! Plus the dynamic column feature, which we think is crucial for Observability-type workloads (from what we know only InfluxDB IOx supports a similar feature).