Expand the approx_distinct() function to support the following types:
INTEGER, SMALLINT, TINYINT, DECIMAL, REAL, DATE,
TIMESTAMP, TIMESTAMPWITHTIMEZONE, TIME, TIMEWITHTIMEZONE, IPADDRESS.
Add a resource group ID column to the system.runtime.queries table.
Add support for executing ORDERBY without LIMIT in a distributed manner.
This can be disabled with the distributed-sort configuration property
or the distributed_sort session property.
Add implicit coercion from VARCHAR(n) to CHAR(n), and remove implicit coercion the other way around.
As a result, comparing a CHAR with a VARCHAR will now follow
trailing space insensitive CHAR comparison semantics.
Improve query cost estimation by only including non-null rows when computing average row size.
Improve query cost estimation to better account for overhead when estimating data size.
Add new semantics that conform to the SQL standard for temporal types.
It affects the TIMESTAMP (aka TIMESTAMPWITHOUTTIMEZONE) type,
TIME (aka TIMEWITHOUTTIMEZONE) type, and TIMEWITHTIMEZONE type.
The legacy behavior remains default.
At this time, it is not recommended to enable the new semantics.
For any connector that supports temporal types, code changes are required before the connector
can work correctly with the new semantics. No connectors have been updated yet.
In addition, the new semantics are not yet stable as more breaking changes are planned,
particularly around the TIMEWITHTIMEZONE type.
JDBC Driver Changes
Add applicationNamePrefix parameter, which is combined with
the ApplicationName property to construct the client source name.
Hive Connector Changes
Reduce ORC reader memory usage by reducing unnecessarily large internal buffers.
Support reading from tables with skip.footer.line.count and skip.header.line.count
when using HDFS authentication with Kerberos.
Add support for case-insensitive column lookup for Parquet readers.