Keyfigure comments bound to database level persistence

1. A computer-implemented method comprising:

an in-memory database engine of an in-memory database receiving a request for a first tuple from a planning application, the first tuple comprising a first dimension, the first dimension comprising a first keyfigure, the first keyfigure comprising a time attribute, the in-memory database comprising a time series table including the time attribute;

based upon the first dimension, the in-memory database engine referencing a dependency table stored in the in-memory database to produce dimension dependency stored in the dependency table, the dimension dependency information revealing the first dimension as being related to the second dimension;

based on the dimension dependency information, the in-memory database engine transforming, using a join operation, a comment stored with a second tuple to be bound at database level persistence with the first tuple stored in the in-memory database, the transforming further comprising persisting in the in-memory database a time table storing fields of the time series table and a reference to the comment; and

the in-memory database returning the first tuple and the comment to the planning application.

2. A method as in claim 1 further comprising:

prior to receiving the request, the in-memory database engine receiving the comment with the second tuple; and

the in-memory database engine creating the comment bound to the second tuple in a first comment table of the in-memory database.

3. A method as in claim 2 wherein the in-memory database engine transforms the comment that is bound to the second tuple in a second comment table of the in-memory database.

4. A method as in claim 1 wherein the first dimension comprises a first keyfigure.

5. A method as in claim 4 wherein the dimension dependency information comprises a dependency between the first keyfigure and the second dimension comprising a second keyfigure.

6. A method as in claim 4 wherein:

if the time series table already includes another comment, the method further comprising checking whether the reference should be inserted.

7. A method as in claim 4 wherein: the first keyfigure comprises a time attribute; the in-memory database comprises a time series table including the time attribute; and the method further comprises adding a comment indicator to the time series table.

8. A non-transitory computer readable storage medium embodying a computer program for performing a method, said method comprising:

an in-memory database engine of an in-memory database receiving a request for a first tuple from a planning application, the first tuple comprising a first dimension, the first dimension comprising a first keyfigure, the first keyfigure comprising a time attribute, the in-memory database comprising a time series table including the time attribute;

based upon the first dimension, the in-memory database engine referencing a dependency table stored in the in-memory database to produce dimension dependency information stored in the dependency table, the dimension dependency information revealing the first dimension as being related to the second dimension;

based on the dimension dependency information, the in-memory database engine transforming, using a join operation, a comment stored with a second tuple to be bound at database level persistence with the first tuple stored in the in-memory database, the transforming further comprising persisting in the in-memory database a time table storing fields of the time series table and a reference to the comment; and

the in-memory database returning the first tuple and the comment to the planning application.

9. A non-transitory computer readable storage medium as in claim 8 further comprising:

prior to receiving the request, the in-memory database engine receiving the comment with the second tuple; and

the in-memory database engine creating the comment bound to the second tuple in a first comment table of the in-memory database.

10. A non-transitory computer readable storage medium as in claim 9 wherein the first dimension comprises a first keyfigure.

11. A computer system comprising:

one or more processors;

a software program, executable on said computer system, the software program configured to cause an engine of an in-memory database to:

receive a request for a first tuple from a planning application, the first tuple comprising a first dimension comprising a keyfigure including a time attribute, the in-memory database comprising a time series table including the time attribute;

based upon the first dimension, reference a dependency table stored in the in-memory database to produce dimension dependency information stored in the dependency table, the dimension dependency information revealing the first dimension as being related to the second dimension;

based on the dimension dependency information, transform, using a join operation, a comment stored with a second tuple to be bound at database level persistence with the first tuple stored in the in-memory database, wherein the transforming comprises

persisting in the in-memory database, a time table storing fields of the time series table including the time attribute and a reference to the comment; and

return the first tuple and the comment to the planning application.

12. A computer system as in claim 11 wherein the software program is further configured to cause the in-memory database engine to:

prior to receiving the request, receive the comment with the second tuple; and

create the comment bound to the second tuple in a comment table of the in-memory database.

13. A computer system as in claim 12 wherein the software program is further configured to cause the in memory database engine to:

bind the comment to the first tuple in another comment table of the in-memory database.