Presto 0.100 Documentation

10.24. Release 0.77

10.24. Release 0.77

Parametric Types

Presto now has a framework for implementing parametric types and functions. Support for ARRAY and MAP types has been added, including the element accessor operator [], and new 数组函数和运算符.

Streaming Index Joins

Index joins will now switch to use a key-by-key streaming join if index results fail to fit in the allocated index memory space.

Distributed Joins

Joins where both tables are distributed are now supported. This allows larger tables to be joined, and can be enabled with the distributed-joins-enabled flag. It may perform worse than the existing broadcast join implementation because it requires redistributing both tables. This feature is still experimental, and should be used with caution.

Hive Changes

  • Handle spurious AbortedException when closing S3 input streams
  • Add support for ORC, DWRF and Parquet in Hive
  • Add support for DATE type in Hive
  • Fix performance regression in Hive when reading VARCHAR columns

Kafka Changes

  • Fix Kafka handling of default port
  • Add support for Kafka messages with a null key

General Changes

  • Fix race condition in scheduler that could cause queries to hang
  • Add ConnectorPageSource which is a more efficient interface for column-oriented sources
  • Add support for string partition keys in Cassandra
  • Add support for variable arity functions
  • Add support for count() for all types
  • Fix bug in HashAggregation that could cause the operator to go in an infinite loop