Add rule on post-processing query results

[szarnyasg]

No description provided.

[ArnauPrat]

First and foremost, I'd talk about the "test driver" instead of the benchmark client.
I think we should consider these two things:

• Lossless compression during the communication between the test driver and the DBMS should be allowed. For instance, as long as in the DBMS you use a data type that conforms with the schema requirements for a given attribute in the schema, you can apply compression to send it back to/from the driver and decompress it. The same applies for query parameters and results. In both ends you need to have fully qualified datatypes, but during transmission, you can apply compression. So for query 14, the implementation should ultimately produce a floating point score.
• All computing for a given query, needs to happen in the DBMS. So for query 14, you can defer the division til the end, but it needs to happen there before transmission. In other words, partial results cannot be transmited.

[szarnyasg]

Hello @ArnauPrat, a bit belatedly, but I applied your feedback to the documentation. Thanks!