12.28. Release 0.208
This release has the potential for data loss in the Hive connectorwhen writing bucketed sorted tables.
- Fix an issue with memory accounting that would lead to garbage collection pausesand out of memory exceptions.
- Fix an issue that produces incorrect results when is enabled (#10724).
- Make the cluster out of memory killer more resilient to memory accounting leaks.Previously, memory accounting leaks on the workers could effectively disablethe out of memory killer.
- Improve planning time for queries over tables with high column count.
- Add a limit on the number of stages in a query. The default is
100
and canbe changed with the configuration property and thequery_max_stage_count
session property. - Add and functions.
- Add a cluster memory leak detector that logs queries that have possibly accounted formemory usage incorrectly on workers. This is a tool to for debugging internal errors.
- Add support for correlated subqueries requiring coercions.
- Fix creation of the history file when it does not exist.
- Add
PRESTO_HISTORY_FILE
environment variable to override location of history file.
- Remove size limit for writing bucketed sorted tables.
- Support writer scaling for Parquet.
- Improve stripe size estimation for the optimized ORC writer. This reduces thenumber of cases where tiny ORC stripes will be written.
- Provide the actual size of CHAR, VARCHAR, and VARBINARY columns to the cost based optimizer.
- Include error message from remote server in query failure message.