presto
https://github.com/prestodb/presto
Java
The official home of the Presto distributed SQL query engine for big data
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- Issues
- Only support single statement writes by default
- Materialized view should support queries with joins having more than 2 tables
- Improve estimation of row count from partition samples
- Concurrent PrestoQueries are getting Slow as Concurrency increases
- Pushdown DISTINCT agg fields as (additional) GROUP BY keys
- Pushdown partial agg below filter (and add the additional keys to the agg)
- Add optimiztion to drop groups/rows with all fields null
- Pushown agg to join branches if the group by and join keys are the same
- Use and record writer time zone in ORC files
- Timely invalidation of file/stripe footer cache for ORC and Parquet hive files in RaptorX
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- Java not yet supported