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How does Druid compare to Vertica?
Vertica is similar to ParAccel/Redshift (Druid-vs-Redshift) described above in that it wasn’t built for real-time streaming data ingestion and it supports full SQL.
The other big difference is that instead of employing indexing, Vertica tries to optimize processing by leveraging run-length encoding (RLE) and other compression techniques along with a "projection" system that creates materialized copies of the data in a different sort order (to maximize the effectiveness of RLE).
We are unclear about how Vertica handles data distribution and replication, so we cannot speak to if/how Druid is different.