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2021-01-27 21:42:13
13.55. Release 0.207
General Changes
- Fix a planning issue for queries where correlated references were used in
VALUES
. - Remove support for legacy
JOIN ... USING
behavior. - Change behavior for unnesting an array of
row
type to produce multiple columns. - Deprecate the
reorder_joins
session property and the reorder-joins
configuration property. They are replaced by the join_reordering_strategy
session property and the optimizer.join-reordering-strategy
configuration property. NONE
maintains the order of the joins as written and is equivalent to reorder_joins=false
. ELIMINATE_CROSS_JOINS
will eliminate any unnecessary cross joins from the plan and is equivalent to reorder_joins=true
. AUTOMATIC
will use the new cost-based optimizer to select the best join order. To simplify migration, setting the reorder_joins
session property overrides the new session and configuration properties. - Deprecate the
distributed_joins
session property and the distributed-joins-enabled
configuration property. They are replaced by the join_distribution_type
session property and the join-distribution-type
configuration property. PARTITIONED
turns on hash partitioned joins and is equivalent to distributed_joins-enabled=true
. BROADCAST
changes the join strategy to broadcast and is equivalent to distributed_joins-enabled=false
. AUTOMATIC
will use the new cost-based optimizer to select the best join strategy. If no statistics are available, AUTOMATIC
is the same as REPARTITIONED
. To simplify migration, setting the distributed_joins
session property overrides the new session and configuration properties. - Add support for column properties.
- Add
optimizer.max-reordered-joins
configuration property to set the maximum number of joins that can be reordered at once using cost-based join reordering. - Add support for
char
type to approx_distinct()
.
Security Changes
- Fail on startup when configuration for file based system access control is invalid.
- Add support for securing communication between cluster nodes with Kerberos authentication.
Web UI Changes
- Add peak total (user + system) memory to query details UI.
Hive Connector Changes
- Fix handling of
VARCHAR(length)
type in the optimized Parquet reader. Previously, predicate pushdown failed with Mismatched Domain types: varchar(length) vs varchar
. - Fail on startup when configuration for file based access control is invalid.
- Add support for HDFS wire encryption.
- Allow ORC files to have struct columns with missing fields. This allows the table schema to be changed without rewriting the ORC files.
- Change collector for columns statistics to only consider a sample of partitions. The sample size can be changed by setting the
hive.partition-statistics-sample-size
property.
Memory Connector Changes
- Add support for dropping schemas.
SPI Changes
- Remove deprecated table/view-level access control methods.
- Change predicate in constraint for accessing table layout to be optional.
- Change schema name in
ConnectorMetadata
to be optional rather than nullable.