Release 326 (27 Nov 2019)

General

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

Allow running Presto with {ref}Java 11 or above <requirements-java>. ({issue}2057)

Deprecate Kerberos in favor of JWT for {doc}/security/internal-communication. ({issue}2032)

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

Collect statistics on the count and duration of each call to Phoenix. ({issue}2024)

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. ({issue}2024)
Add support for showing column comments. ({issue}1840)