An update on the state of the project, recent advancements and upcoming improvements.

1. Martin Traverso
April 21, 2021
State of the Project

2. What’s Trino
(formerly known as PrestoSQL)
• If you know Presto…
• If you’ve been using PrestoSQL…
• … same software, same people, same community
• … under a shiny new name and a cute bunny
• More details: https://trino.io/blog/2020/12/27/announcing-trino.html
• Migrating to a recent version: https://trino.io/blog/2021/01/04/migrating-from-prestosql-to-trino.html

3. Give us a star!
http://trino.io/star
https://star-history.t9t.io/#trinodb/trino

4. Stats
• 461 contributors
• 4036 Slack members (~500 active weekly)
• 55 releases since split (one release every ~2 weeks)
• 8043 commits since split (23,020 total)

6. Who uses it?
https://trino.io/users.html

7. Recent Innovations

8. Security
• Web UI and endpoint security
• https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2020-15087
• OAuth 2.0 support for Web UI, CLI and JDBC driver

9. Language Features

10. WINDOW clause
SELECT
avg(totalprice) OVER w,
sum(totalprice) OVER w,
max(totalprice) OVER w
FROM orders
WINDOW w AS (
PARTITION BY custkey
ORDER BY orderdate
RANGE BETWEEN interval '1' month PRECEDING AND CURRENT ROW)
See more details: https://trino.io/blog/2021/03/10/introducing-new-window-features.html

11. RANGE/GROUPS window frame
SELECT avg(totalprice) OVER (
PARTITION BY custkey
ORDER BY orderdate
RANGE BETWEEN interval '1' month PRECEDING AND CURRENT ROW)
FROM orders
SELECT
student_id,
score,
max(score) OVER (
ORDER BY score
GROUPS BETWEEN CURRENT ROW AND 1 FOLLOWING) - score
FROM scores
See more details: https://trino.io/blog/2021/03/10/introducing-new-window-features.html

12. Timestamp semantics
• Before
• After
presto> SELECT CAST('2021-03-14 02:30:00' AS timestamp);
Query 20210420_005314_00001_h3id7 failed: Value cannot be cast to timestamp: 2021-03-14 02:30:00
trino> SELECT CAST('2021-03-14 02:30:00' AS timestamp);
_col0
-------------------------
2021-03-14 02:30:00.000
(1 row)

13. Variable precision temporal types
trino> SELECT
localtimestamp(6),
current_timestamp(1),
localtime(5),
current_time(3) G
-[ RECORD 1 ]------------------------------------
_col0 | 2021-04-19 17:59:55.669946
_col1 | 2021-04-19 17:59:56.7 America/Los_Angeles
_col2 | 17:59:55.66995
_col3 | 17:59:55.670-07:00
trino> SELECT typeof(TIMESTAMP '2021-04-21 12:34:56.123456789123');
_col0
---------------
timestamp(12)
(1 row)

14. Correlated subqueries with UNNEST
WITH t(a) AS (VALUES
array[1, 1, 2],
array[4, 5, 6, 20])
SELECT *
FROM t
WHERE (SELECT max(v) - avg(v) FROM UNNEST(t.a) AS u(v)) > 1
a
---------------
[4, 5, 6, 20]
(1 row)

15. UPDATE
UPDATE purchases
SET status = 'OVERDUE'
WHERE ship_date IS NULL
See more: https://trino.io/docs/current/sql/update.html

16. Performance
• Dynamic filtering and partition pruning
• https://trino.io/blog/2019/06/30/dynamic-filtering.html
• https://trino.io/blog/2020/06/14/dynamic-partition-pruning.html
• Optimized Parquet writer (experimental)
• Pushdown of complex operations (aggregation, join, order by + limit, etc)

17. New Connectors
• Apache Iceberg (https://trino.io/episodes/14.html)
• Apache Druid
• Apache Pinot (https://trino.io/episodes/13.html)
• MemSQL
• BigQuery
• ClickHouse
• Oracle
• Prometheus

18. Other improvements
• Complex Hive views
• ORC ACID table support
• Multiple event listeners
• Multiple password authenticators
• And much, much more…
• https://trino.io/blog/2020/01/01/2019-summary.html
• https://trino.io/blog/2021/01/08/2020-review.html

19. Upcoming Improvements

20. Upcoming Improvements
MERGE
MATCH_RECOGNIZE
Materialized view improvements
Dynamic function resolution
Parquet column indexes
Custom metrics from connectors Vertica connector
Pinot connector improvements

21. Getting involved
• Slack: https://trino.io/slack.html
• Contribute code:
• https://trino.io/development
• “good first issue” tag on github
• File issues/bugs:
• https://github.com/trinodb/trino
• Write blog posts:
• https://trino.io/blog
https://trino.io/community.html

22. Resources
• Trino book
• https://trino.io/trino-the-definitive-guide
• Community Broadcast
• https://trino.io/broadcast/
• Blog
• https://trino.io/blog

23. Q&A