Release 326 (27 Nov 2019)

General

• Fix incorrect query results when query contains LEFT JOIN over UNNEST. (#2097)
• Fix performance regression in queries involving JOIN. (#2047)
• Fix accounting of semantic analysis time when queued queries are cancelled. (#2055)
• Add SingleStore connector. (#1906)
• Improve performance of INSERT and CREATE TABLE ... AS queries containing redundant ORDER BY clauses. (#2044)
• Improve performance when processing columns of map type. (#2015)

Server RPM

• Allow running Presto with Java 11 or above. (#2057)

Security

• Deprecate Kerberos in favor of JWT for Secure internal communication. (#2032)

Hive

• Fix table creation error for tables with S3 location when using file metastore. (#1664)
• Fix a compatibility issue with the CDH 5.x metastore which results in stats not being recorded for ANALYZE. (#973)
• Improve performance for Glue metastore by fetching partitions in parallel. (#1465)
• Improve performance of sql-standard security. (#1922, #1929)

Phoenix connector

• Collect statistics on the count and duration of each call to Phoenix. (#2024)

Other connectors

These changes apply to the MySQL, PostgreSQL, Redshift, and SQL Server connectors.

• Collect statistics on the count and duration of operations to create and destroy JDBC connections. (#2024)
• Add support for showing column comments. (#1840)