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2021-01-27 21:43:19
13.104. Release 0.158
General Changes
- Fix regression that could cause high CPU and heap usage on coordinator when processing certain types of long running queries.
- Fix incorrect pruning of output columns in
EXPLAIN ANALYZE
. - Fix ordering of
CHAR
values so that trailing spaces are ordered after control characters. - Fix query failures for connectors that produce non-remotely accessible splits.
- Fix non-linear performance issue when parsing certain SQL expressions.
- Fix case-sensitivity issues when operating on columns of
ROW
data type. - Fix failure when creating views for tables names that need quoting.
- Return
NULL
from element_at()
for out-of-range indices instead of failing. - Remove redundancies in query plans, which can reduce data transfers over the network and reduce CPU requirements.
- Validate resource groups configuration file on startup to ensure that all selectors reference a configured resource group.
- Add experimental on-disk merge sort for aggregations. This can be enabled with the
experimental.spill-enabled
configuration flag. - Push down predicates for
DECIMAL
, TINYINT
, SMALLINT
and REAL
data types.
Hive Changes
- Add hidden
$bucket
column for bucketed tables that contains the bucket number for the current row. - Prevent inserting into non-managed (i.e., external) tables.
- Add configurable size limit to Hive metastore cache to avoid using too much coordinator memory.
Cassandra Changes
- Allow starting the server even if a contact point hostname cannot be resolved.