Release 0.184

General

• Fix query execution failure for split_to_map(...)[...].
• Fix issue that caused queries containing CROSS JOIN to continue using CPU resources even after they were killed.
• Fix planning failure for some query shapes containing count(*) and a non-empty GROUP BY clause.
• Fix communication failures caused by lock contention in the local scheduler.
• Improve performance of {func}element_at for maps to be constant time rather than proportional to the size of the map.
• Improve performance of queries with gathering exchanges.
• Require coalesce() to have at least two arguments, as mandated by the SQL standard.
• Add {func}hamming_distance function.

JDBC driver

• Always invoke the progress callback with the final stats at query completion.

Web UI

• Add worker status page with information about currently running threads and resource utilization (CPU, heap, memory pools). This page is accessible by clicking a hostname on a query task list.

Hive

• Fix partition filtering for keys of CHAR, DECIMAL, or DATE type.
• Reduce system memory usage when reading table columns containing string values from ORC or DWRF files. This can prevent high GC overhead or out-of-memory crashes.

TPC-DS

• Fix display of table statistics when running SHOW STATS FOR ....

SPI

• Row columns or values represented with ArrayBlock and InterleavedBlock are no longer supported. They must be represented as RowBlock or SingleRowBlock.
• Add source field to ConnectorSession.