General Changes#

• Fix issue where auto-commit transaction can be rolled back for a successfully completed query.
• Fix detection of colocated joins.
• Fix planning bug involving partitioning with constants.
• Fix window functions to correctly handle empty frames between unbounded and bounded in the same direction. For example, a frame such as ROWS BETWEEN UNBOUNDED PRECEDING AND 2 PRECEDING would incorrectly use the first row as the window frame for the first two rows rather than using an empty frame.
• Fix correctness issue when grouping on columns that are also arguments to aggregation functions.
• Fix failure when chaining AT TIME ZONE, e.g. SELECT TIMESTAMP '2016-01-02 12:34:56' AT TIME ZONE 'America/Los_Angeles' AT TIME ZONE 'UTC'.
• Fix data duplication when task.writer-count configuration mismatches between coordinator and worker.
• Fix bug where node-scheduler.max-pending-splits-per-node-per-task config is not always honored by node scheduler. This bug could stop the cluster from making further progress.
• Fix incorrect results for grouping sets with partitioned source.
• Add colocated-joins-enabled to enable colocated joins by default for connectors that expose node-partitioned data.
• Add support for colocated unions.
• Reduce initial memory usage of array_agg() function.
• Improve planning of co-partitioned JOIN and UNION.
• Improve planning of aggregations over partitioned data.
• Improve the performance of the array_sort() function.
• Improve outer join predicate push down.
• Increase default value for query.initial-hash-partitions to 100.
• Change default value of query.max-memory-per-node to 10% of the Java heap.
• Change default task.max-worker-threads to 2 times the number of cores.
• Use HTTPS in JDBC driver when using port 443.
• Warn if Presto server is not using G1 garbage collector.
• Move interval types out of SPI.

Interval Fixes#

This release fixes several problems with large and negative intervals.

• Fix parsing of negative interval literals. Previously, the sign of each field was treated independently instead of applying to the entire interval value. For example, the literal INTERVAL '-2-3' YEAR TO MONTH was interpreted as a negative interval of 21 months rather than 27 months (positive 3 months was added to negative 24 months).
• Fix handling of INTERVAL DAY TO SECOND type in REST API. Previously, intervals greater than 2,147,483,647 milliseconds (about 24 days) were returned as the wrong value.
• Fix handling of INTERVAL YEAR TO MONTH type. Previously, intervals greater than 2,147,483,647 months were returned as the wrong value from the REST API and parsed incorrectly when specified as a literal.
• Fix formatting of negative intervals in REST API. Previously, negative intervals had a negative sign before each component and could not be parsed.
• Fix formatting of negative intervals in JDBC PrestoInterval classes.

Functions and Language Features#

• Add element_at() function for map type.
• Add split_to_map() function.
• Add zip() function.
• Add map_union() aggregation function.
• Add ROW syntax for constructing row types.
• Add support for REVOKE permission syntax.
• Add support for SMALLINT and TINYINT types.
• Add support for non-equi outer joins.

Verifier Changes#

• Add skip-cpu-check-regex config property which can be used to skip the CPU time comparison for queries that match the given regex.
• Add check-cpu config property which can be used to disable CPU time comparison.

Hive Changes#

• Fix NoClassDefFoundError for KMSClientProvider in HDFS client.
• Fix creating tables on S3 in an empty database.
• Implement REVOKE permission syntax.
• Add support for SMALLINT and TINYINT
• Support DELETE from unpartitioned tables.
• Add support for Kerberos authentication when talking to Hive/HDFS.
• Push down filters for columns of type DECIMAL.
• Improve CPU efficiency when reading ORC files.

Cassandra Changes#

• Allow configuring load balancing policy and no host available retry.
• Add support for varchar(n).

Kafka Changes#

• Update to Kafka client 0.8.2.2. This enables support for LZ4 data.

JMX Changes#

• Add jmx.history schema with in-memory periodic samples of values from JMX MBeans.

MySQL and PostgreSQL Changes#

• Push down predicates for VARCHAR, DATE, TIME and TIMESTAMP types.

Other Connector Changes#

• Add support for varchar(n) to the Redis, TPCH, MongoDB, Local File and Example HTTP connectors.