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It is not possible to compute the exact dimensions of data types like blob or map<text,text> in Cassandra as they are variable length data types. The size of blob data type depends on the size of bytes stored in it, whereas the size of map<text,text> is determined by the number of key-value pairs and the length of the text values. However, you can estimate the size of these data types based on the size of the data they store or by checking the size of the data stored in it using Cassandra's system tables.