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Release 0.262

presto-docs/src/main/sphinx/release/release-0.262.rst

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============= Release 0.262

Highlights

  • Fix a correctness bug which could be triggered for queries with aggregations on partitioning columns and filters on non-partitioning columns when both optimizing metadata queries and filter pushdown are enabled.
  • Add support for elastic workers by implementing time-to-live based node scheduling for queries with execution time estimates. See :pr:16409

Details

General Changes

  • Fix :func:!reduce_agg to allow NULL as the result of input/combine functions, while also allowing only constant expressions and not NULL as the initial value.
  • Fix a correctness bug which could be triggered for queries with aggregations on partitioning columns and filters on non-partitioning columns when both optimizing metadata queries and filter pushdown are enabled.
  • Add default size limit (100MB) to build side of broadcast join.
  • Add support for elastic workers by implementing time-to-live based node scheduling for queries with execution time estimates. This can be enabled by setting either the resource_aware_scheduling_strategy session property or the experimental.resource-aware-scheduling-strategy configuration property to TTL. See :pr:16409.
  • Add adjusted queue size information to the v1/cluster endpoint.

SPI Changes

  • Add support for custom node time-to-live (TTL) fetchers (to fetch TTLs of nodes) and cluster TTL providers (to compute the TTL of a cluster) through the NodeTtlFetcher and ClusterTtlProvider interfaces respectively. See :pr:16409.

Hive Changes

  • Fix issue while reading Apache HUDI tables when PrestoFileSystemCache is refreshed. The issue occurs because HoodieROTablePathFilter is cached with default Configuration object (:pr:16611).
  • Add session property hive.cache_enabled to allow turning on and off data cache per query.

Credits

Ajay George, Ariel Weisberg, Arunachalam Thirupathi, Brian Li, Jalpreet Singh Nanda (:imjalpreet), James Petty, James Sun, Neerad Somanchi, Shixuan Fan, Sreeni Viswanadha, Swapnil Tailor, Tal Galili, Timothy Meehan, Vivek, Xiang Fu, Ying, Zac Wen, Zhan Yuan, Zhenxiao Luo, Zhongting Hu, abhiseksaikia