============================================================================== 
DataStax Cassandra ODBC Data Connector Release Notes 
============================================================================== 

The release notes provide details of enhancements, features, known issues, 
and workflow changes in DataStax Cassandra ODBC Connector 2.7.7, as well as 
the version history.


2.7.7 ========================================================================

Released 2025-04-11

Enhancements & New Features 

 * Updated third-party libraries

   The connector now uses the following third-party libraries:
   - Expat 2.7.1 (previously 2.6.3)   
   - OpenSSL 3.0.16 (previously 3.0.15) 

 * Updated Cassandra version support
   
   The connector now supports Apache Cassandra versions 4.0 through 5.0. For a
   list of supported Cassandra versions, see the Installation and 
   Configuration Guide.

 * Upgraded Windows Server support

   The connector now uses Windows Server 2025. For a list of supported 
   versions, see the Installation and Configuration Guide.


Resolved Issues
The following issue has been resolved in DataStax Cassandra ODBC Connector 
2.7.7.

 * [CASSO-1070] For null table name value in the Catalog function, the latest 
   connector returned it as an empty string.


Known Issues
The following are known issues that you may encounter due to limitations in 
the data source, the connector, or an application.

 * INSERT statement fails when inserting multiple rows and binding the 
   DEFAULT value in the first row.

   When inserting multiple rows in a single SQL statement and binding the 
   DEFAULT value in the first row, the INSERT statement fails. As a 
   workaround, use NULL instead of DEFAULT.

 * Non-key virtual table columns are not nullable.

   Cassandra does not support null values in collections. The connector reports 
   non-key columns in virtual tables as not nullable.

 * On Cassandra 2.1.x, the connector returns incorrect values for VARINT 
   (SQL_NUMERIC) columns.

   This is due to a limitation in the DataStax cpp-driver. For more 
   information, see the following link:
   https://DataStax-oss.atlassian.net/browse/CPP-419

 * If a user-defined type is the primary key of a table, none of the primary 
   key's fields can be null when it is used in an INSERT statement.

 * A column name collision occurs if a map contains two user-defined types 
   with identical field names, that is, if the map's key and value are the 
   same user-defined type.
   
 * [CASSO-752] Attempting to perform INSERT or UPDATE queries on tables with
   columns of type TUPLE or UDT (when ReturnUdtAsString is enabled) results in
   the connector returning an error.    


Workflow Changes =============================================================

The following changes may disrupt workflows from earlier versions.


2.7.4 ------------------------------------------------------------------------

 * Removed support for earlier operating system versions

   Beginning with this release, the connector no longer supports the following 
   operating system versions:
   - Centos 7
   - Debian 8, 9, and 10 
   - RHEL 7
   - Ubuntu 16.04 and 18.04
 
   For a list of supported operating system versions, see the Installation and 
   Configuration Guide.

 * Removed Visual Studio 2015 support 

   Beginning with this release, the connector no longer supports Visual Studio 
   2015. For information about the supported Visual C++ Redistributable for 
   Visual Studio versions, see the Installation and Configuration Guide.

 * Removed support for unused connection parameters

   Beginning with this release, the connector no longer supports the following
   connection parameters:
   - MaxConcurrentCreation
   - MaxConcurrentRequestsThreshold
   - MaxConnectionsPerHost
   - MaxRequestsPerFlush
   - PendingRequestsHighWaterMark
   - PendingRequestsLowWaterMark
   - QueueSizeEvent
   - WriteBytesHighWaterMark
   - WriteBytesLowWaterMark

   For a list of supported connection parameters, see the Installation and 
   Configuration Guide.


2.6.10 ------------------------------------------------------------------------

 * [CASSO-650] Support for earlier versions of Windows removed

   Beginning with this release, the connector no longer supports the following 
   versions of Windows:
   - Windows 7
   - Windows Server 2008
   - Windows Server 2008r2

   For a list of supported Windows versions, see the Installation and 
   Configuration Guide.


 * [CASSO-670] Support for CentOS 6 and RHEL 6 removed

   Beginning with this release, the connector no longer supports the following 
   versions of Linux:
   - CentOS 6 
   - Red Hat Enterprise Linux (RHEL) 6

   For a list of supported Linux versions, see the Installation and 
   Configuration Guide.


2.6.6 ------------------------------------------------------------------------

 * Support for Visual Studio 2013 removed

   Beginning with this release, the connector no longer supports Visual Studio 
   2013. For a list of supported Visual Studio versions, see the Installation 
   and Configuration Guide.


2.6.0 ------------------------------------------------------------------------

 * Support for Apache Cassandra 2.0 removed

   Beginning with this release, the connector no longer supports Apache 
   Cassandra 2.0. The connector now supports Apache Cassandra 2.1, 2.2, and 
   3.0.


Version History ==============================================================

2.7.6 ------------------------------------------------------------------------

Released 2024-09-25

Enhancements & New Features 

 * Updated third-party libraries

   The connector now uses the following third-party libraries:
   - Expat 2.6.3 (previously 2.6.2)   
   - OpenSSL 3.0.15 (previously 3.0.13) 


2.7.5 ------------------------------------------------------------------------

Released 2024-08-14

Enhancements & New Features 

 * Security improvement
   
   The connector has been updated with security improvements.

 * Upgraded libuv support

   The connector now uses libuv 1.48.0 version. Previously, the connector used
   1.38.1 version.

2.7.4 ------------------------------------------------------------------------

Released 2024-04-05

Enhancements & New Features 

 * Upgraded Visual Studio support

   The connector now uses Windows Visual Studio 2022. For supported versions,
   see the Installation and Configuration Guide.

 * Updated Ubuntu Support

   The connector now supports Ubuntu 22.04. For a list of supported Linux 
   versions, see the Installation and Configuration Guide.

 * Updated third-party libraries

   The connector now uses the following third-party libraries:
   - Expat 2.6.2 (previously 2.5.0)
   - OpenSSL 3.0.13 (previously 3.0.11) 
   - Zlib 1.3.1 (previously 1.2.13)

 * Updated security checks

   The following compiler and linker flags have been used to improve security
   checks in the connector:  
   - /CETCOMPAT
   - /Qspectre

 * Updated non-required connection parameters

   Some of the non-required connection parameters are no longer supported. For
   more information, see the Workflow changes section.

 * Updated FIPS support 

   You can now enable FIPS support by downloading a separate FIPS package 
   available for assistance. For more information, see the Installation and
   Configuration Guide.


2.7.3 ------------------------------------------------------------------------

Released 2023-10-03

Enhancements & New Features 

 * Updated third-party libraries

   The connector now uses the following third-party libraries:
   - CPP 2.17.0 (previously 2.16.2) 
   - OpenSSL 3.0.11 (previously 3.0.8) 


2.7.2 ------------------------------------------------------------------------

Released 2023-07-26

Resolved Issues
The following issue has been resolved in DataStax Cassandra ODBC Connector 
2.7.2.

 * [CASSO-937] In 2.7.1, when negative values are inserted, the connector 
   incorrectly adds it for decimal data type.


2.7.1 ------------------------------------------------------------------------

Released 2023-06-26

Enhancements & New Features 

 * Updated OpenSSL support
   
   The connector now uses OpenSSL version 3.0.9. Previously, the connector 
   used OpenSSL version 3.0.8.

 * Updated FIPS support

   The connector now supports the FIPS (Federal Information Processing 
   Standards) module to ensure the security, quality, and processing 
   compatibility of various services. For more information, see the 
   Installation and Configuration Guide.


2.7.0 ------------------------------------------------------------------------

Released 2023-03-17

Enhancements & New Features 

 * Updated third-party libraries

   The connector now uses the following third-party libraries:
   - CPP 2.16.2 (previously 2.16.0)   
   - Expat 2.5.0 (previously 2.4.6)   
   - ICU 71.1.x (previously 58.8.x)
   - OpenSSL 3.0.8 (previously 1.1.1s) 
   - Zlib 1.2.13 (previously 1.2.11)

 * Updated Cassandra version support
   
   The connector now supports Apache Cassandra versions 3.0 through 4.1. For a
   list of supported Cassandra versions, see the Installation and 
   Configuration Guide.


Resolved Issues
The following issue has been resolved in DataStax Cassandra ODBC Connector  
2.7.0.

 * [CASSO-906] When values are passed through UUID and TIMEUUID datatypes, the
   connector returns an error.


==============================================================================
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==============================================================================

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For information about contacting Support, go to:
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