Go to table tree node -> Right click -> Create table -> Add column with map datatype.
Go to ER-Modeler menu -> Select Generate -> Select Apache Cassendra database from database type -> Click on OK -> ER-Diagram Generator window open -> Click on NEXT
Add new table in ER-Modeler ->Go to Table Properties -> Add column with map datatype
In Create table GUI suppose we click on Collection Key Data Type in column tab display description of that field at the bottom.
But in ER-Modeler does not display description of any Column Parameters Field at the bottom when we click on any field.