This document summarizes recent updates to Presto, including new data types, connectors, syntax, features, functions, and configuration options. Some key additions are support for DECIMAL, VARCHAR, and new data types; connectors for Redis, MongoDB, and other data sources; transaction support; and a variety of new SQL functions for strings, dates, aggregation, and more. Upcoming work includes prepared statements, a new optimizer, and other performance and usability improvements.

1. Presto changes
July 19, 2016 : Presto meeup
Masahiro Nakagawa

2. • Teradata starts Enterprise support
• http://www.teradata.jp/products-and-services/
presto-download/
• Airpal
• http://airbnb.io/airpal/
• Presto Admin
• https://github.com/prestodb/presto-admin
• Users: https://github.com/prestodb/presto/wiki/Presto-Users
Ecosystem

3. New DataType
• DECIMAL (v0.145)
• VARCHAR(N) (v0.137)
• INTEGER (v0.145)
• Use only 4 byte unlike 8 byte BIGINT
• SMALLINT, TINYINT
• FLOAT (v0.149)

4. New Connectors
• System Connector (v0.100)
• BlackHoleConnector (v0.108)
• Redis Connector (v0.119)
• Tableau Web Connector (v0.126)
• New Parquet Reader for Hive (v0.138)
• MongoDBConnector (v0.146)
• LocalFileConnector (v0.147)

5. New syntax
• CREATE TABLE (v0.101)
• DELETE (v0.107)
• TRY (v0.140)
• CUBE, ROLLUP, GROUPING SETS (v0.142)
• https://prestodb.io/docs/current/sql/
select.html#complex-grouping-operations
• EXPLAIN ANALYZE (v0.144)

6. New features
• String functions assume input is UTF-8 (v0.102)
• Transaction support in SQL / Connector (v0.132)
• Dynamic split concurrency (v0.139)
• non-correlated subquery in aggregation query (v0.142)
• colocated join (v0.147)
• non-equi outer joins (v0.148)

7. Execution Planner - Split
Sink
Final aggr
Exchange
Sink
Partial aggr
Table scan
Sink
Final aggr
Exchange
Sink
Partial aggr
Table scan
Output
Exchange
Split
many splits / task
= many threads / worker
(table scan)
1 split / task
= 1 thread / worker
Worker 1 Worker 2
1 split / worker
= 1 thread / worker

8. Configuration
• node-scheduler.network-topology (v0.129)
• legacy or flat for consider work queue
• query.max-cpu-time (v0.143)
• Limit CPU usage of a query

9. Operation
• Worker: Graceful shutdown (v0.128)
• resource groups (v0.147)
• resources and query queues isolation for various
workload
• https://prestodb.io/docs/current/admin/resource-
groups.html
• G1GC is recomended (v0.148)

10. New function (1)
• String
• normalize, lpad, rpad, split_to_map, substring, from_utf8, to_utf8, split
• Math
• truncate, width_bucket, sign, to_base, from_base, degrees, radians
• Array
• array_distinct, array_intersect, array_position, array_join, array_min,
array_max, slice, element_at, flatten, sequence, array_remove
• Map
• element_at, map_concat

11. New function (2)
• Aggregation
• map_agg, bool_and, bool_or, array_agg, geometric_mean, map_union,
multimap_agg, checksum, histogram, cover_pop, cover_samp, corr,
regr_slope, regr_intercept
• Binary
• md5, sha1, sha256, sha512
• Bitwise
• bit_count, bitwise_not, bitswise_and, bitwise_or, bitwise_xor
• URL
• url_encode, url_decode

12. New function (3)
• datetime
• date_format, date_parse, from_iso8601_timestamp,
from_iso8601_date, to_iso8601, year_of_week
• Regexp
• regexp_split, regexp_extract_all,

13. Next features
• https://github.com/prestodb/presto/wiki/Roadmap
• Prepared statements
• New optimizer
• Materialized query tables
• Spill to disk
• HTTP/2
• etc…