Hi Rama,
In SAP HANA, the table is generally stored in column store,
In this a column is divided into two parts - Dictionary Encoding and Attribute Vector.
Dictionary Encoding stores Implicit value ID and unique records only.
Then Attribute Vector stores position of all the records and corresponding Implicit Values.
Thus there is no duplicacy and no need of indexes.
To have more understanding and clearer picture, please watch these videos:
https://open.sap.com/course/hana-warmup
Here everything is explained about Column Store, Insertion and Deletion in column store table.
Regards,
Vivek