KNIME Core Columnar Data Access. Used by the framework for efficient in-memory access to KNIME tables.
Extension 
KNIME Columnar Table Backend
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Copyright by KNIME AG, Zurich, Switzerland
Update site information
KNIME Analytics Platform 4.5 Update Site, Version 4.5.0
http://update.knime.com/analytics-platform/4.5
In case you can’t install the extension via drag & drop, please check that the update site is activated.