Release 0.190#
General#
- Fix correctness issue for - array_min()and- array_max()when arrays contain- NaN.
- Fix planning failure for queries involving - GROUPINGthat require implicit coercions in expressions containing aggregate functions.
- Fix potential workload imbalance when using topology-aware scheduling. 
- Fix performance regression for queries containing - DISTINCTaggregates over the same column.
- Fix a memory leak that occurs on workers. 
- Improve error handling when a - HAVINGclause 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 - BingTiletype.
- The - approx_distinct()function now supports a standard error in the range of- [0.0040625, 0.26000].
- Add support for - ORDER BYin 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-enabledconfig property or the- dictionary_processing_joinsession property.
- Add support for casting to - INTERVALtypes.
- Add - ST_Buffer()geospatial function.
- Allow treating decimal literals as values of the - DECIMALtype rather than- DOUBLE. This behavior can be enabled by setting the- parse-decimal-literals-as-doubleconfig property or the- parse_decimal_literals_as_doublesession property to- false.
- Add JMX counter to track the number of submitted queries. 
Resource groups#
- Add priority column to the DB resource group selectors. 
- Add exact match source selector to the DB resource group selectors. 
CLI#
- Add support for setting client tags. 
JDBC driver#
- Add - getPeakMemoryBytes()to- QueryStats.
Accumulo#
- Improve table scan parallelism. 
Hive#
- 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-sizefor 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#
- Make Thrift retry configurable. 
- Add JMX counters for Thrift requests. 
SPI#
- Remove the - RecordSinkinterface, which was difficult to use correctly and had no advantages over the- PageSinkinterface.
Note
This is a backwards incompatible change with the previous connector SPI.
If you have written a connector that uses the RecordSink interface,
you will need to update your code before deploying this release.