10.39. Release 0.90
Warning
This release has a memory leak and should not be used.
General Changes
- Initial support for partition and placement awareness in the query planner. This can result in better plans for queries involving JOIN and GROUP BY over the same key columns.
- Improve planning of UNION queries.
- Add presto version to query creation and completion events.
- Add property task.writer-count to configure the number of writers per task.
- Fix a bug when optimizing constant expressions involving binary types.
- Fix bug where a table writer commits partial results while cleaning up a failed query.
- Fix a bug when unnesting an array of doubles containing NaN or Infinity.
- Fix failure when accessing elements in an empty array.
- Fix “Remote page is too large” errors.
- Improve error message when attempting to cast a value to UNKNOWN.
- Update the approx_distinct() documentation with correct standard error bounds.
- Disable falling back to the interpreter when expressions fail to be compiled to bytecode. To enable this option, add compiler.interpreter-enabled=true to the coordinator and worker config properties. Enabling this option will allow certain queries to run slowly rather than failing.
- Improve JDBC Driver conformance. In particular, all unimplemented methods now throw SQLException rather than UnsupportedOperationException.
Functions and Language Features
- Add bool_and() and bool_or() aggregation functions.
- Add standard SQL function every() as an alias for bool_and().
- Add year_of_week() function.
- Add regexp_extract_all() function.
- Add map_agg() aggregation function.
- Add support for casting JSON to ARRAY or MAP types.
- Add support for unparenthesized expressions in VALUES clause.
- Added SET SESSION, RESET SESSION and SHOW SESSION.
- Improve formatting of EXPLAIN (TYPE DISTRIBUTED) output and include additional information such as output layout, task placement policy and partitioning functions.
Hive Changes
- Disable optimized metastore partition fetching for non-string partition keys. This fixes an issue were Presto might silently ignore data with non-canonical partition values. To enable this option, add hive.assume-canonical-partition-keys=true to the coordinator and worker config properties.
- Don’t retry operations against S3 that fail due to lack of permissions.
SPI Changes
- Add getColumnTypes to RecordSink.
- Use Slice for table writer fragments.
- Add ConnectorPageSink which is a more efficient interface for column-oriented sources.
Note
This is a backwards incompatible change with the previous connector SPI. If you have written a connector, you will need to update your code before deploying this release.