Release 308 (11 Apr 2019)

General

• Fix a regression that prevented the server from starting on Java 9+. ({issue}610)
• Fix correctness issue for queries involving FULL OUTER JOIN and coalesce. ({issue}622)

Security

• Add authorization for listing table columns. ({issue}507)

CLI

• Add option for specifying Kerberos service principal pattern. ({issue}597)

JDBC driver

• Correctly report precision and column display size in ResultSetMetaData for char and varchar columns. ({issue}615)
• Add option for specifying Kerberos service principal pattern. ({issue}597)

Hive connector

• Fix regression that could cause queries to fail with Query can potentially read more than X partitions error. ({issue}619)
• Improve ORC read performance significantly. For TPC-DS, this saves about 9.5% of total CPU when running over gzip-compressed data. ({issue}555)
• Require access to a table (any privilege) in order to list the columns. ({issue}507)
• Add directory listing cache for specific tables. The list of tables is specified using the hive.file-status-cache-tables configuration property. ({issue}343)

MySQL connector

• Fix ALTER TABLE ... RENAME TO ... statement. ({issue}586)
• Push simple LIMIT queries into the external database. ({issue}589)

PostgreSQL connector

• Push simple LIMIT queries into the external database. ({issue}589)

Redshift connector

• Push simple LIMIT queries into the external database. ({issue}589)

SQL Server connector

• Fix writing varchar values with non-Latin characters in CREATE TABLE AS. ({issue}573)
• Support writing varchar and char values with length longer than 4000 characters in CREATE TABLE AS. ({issue}573)
• Support writing boolean values in CREATE TABLE AS. ({issue}573)
• Push simple LIMIT queries into the external database. ({issue}589)

Elasticsearch connector

• Add support for Search Guard in Elasticsearch connector. Please refer to {doc}/connector/elasticsearch for the relevant configuration properties. ({issue}438)