Presto 0.190 发布，Facebook 开源的大数据查询引擎

内容简介：Presto 0.190 已发布，Presto 是 Facebook 开源的数据查询引擎，可对250PB以上的数据进行快速地交互式分析，查询的速度达到商业数据仓库的级别。据称该引擎的性能是 Hive 的 10 倍以上。 Presto 可以查询包括 ...

Presto 0.190 已发布，Presto 是 Facebook 开源的数据查询引擎，可对250PB以上的数据进行快速地交互式分析，查询的速度达到商业数据仓库的级别。据称该引擎的性能是 Hive 的 10 倍以上。

Presto 可以查询包括 Hive、Cassandra 甚至是一些商业的数据存储产品。单个 Presto 查询可合并来自多个数据源的数据进行统一分析。

General Changes

• Fix correctness issue for array_min() and array_max() when arrays contain NaN.

• Fix planning failure for queries involving GROUPING that require implicit coercions in expressions containing aggregate functions.

• Fix potential workload imbalance when using topology-aware scheduling.

• Fix performance regression for queries containing DISTINCT aggregates over the same column.

• Fix a memory leak that occurs on workers.

• Improve error handling when a HAVING clause contains window functions.

• Avoid unnecessary data redistribution when writing when the target table has the same partition property as the data being written.

• Ignore case when sorting the output of SHOW FUNCTIONS.

• Improve rendering of the BingTile type.

• The approx_distinct() function now supports a standard error in the range of [0.0040625, 0.26000].

• Add support for ORDER BY in aggregation functions.

• Add dictionary processing for joins which can improve join performance up to 50%. This optimization can be disabled using the dictionary-processing-joins-enabled config property or the dictionary_processing_join session property.

• Add support for casting to INTERVAL types.

• Add ST_Buffer() geospatial function.

• Allow treating decimal literals as values of the DECIMAL type rather than DOUBLE. This behavior can be enabled by setting the parse-decimal-literals-as-double config property or the parse_decimal_literals_as_double session property to false.

• Add JMX counter to track the number of submitted queries.

Resource Groups Changes

• Add priority column to the DB resource group selectors.

• Add exact match source selector to the DB resource group selectors.

CLI Changes

• Add support for setting client tags.

JDBC Driver Changes

• Add getPeakMemoryBytes() to QueryStats.

Accumulo Changes

• Improve table scan parallelism.

Hive Changes

• Fix query failures for the file-based metastore implementation when partition column values contain a colon.

• Improve performance for writing to bucketed tables when the data being written is already partitioned appropriately (e.g., the output is from a bucketed join).

• Add config property hive.max-outstanding-splits-size for the maximum amount of memory used to buffer splits for a single table scan. Additionally, the default value is substantially higher than the previous hard-coded limit, which can prevent certain queries from failing.

Thrift Connector Changes

• Make Thrift retry configurable.

• Add JMX counters for Thrift requests.

SPI Changes

• Remove the RecordSink interface, which was difficult to use correctly and had no advantages over the PageSink interface.

下载地址：

• Source code (zip)

• Source code (tar.gz)

【声明】文章转载自：开源中国社区 [http://www.oschina.net]

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