There are 2-3 different row representations in the code use for aggregation, joins and sorting, and it would be helpful architecturally if they could be combined in some fashion to avoid code duplication and standardise the representations.

There is an existing discussion covering the initial discussions. A quick summary of the requirements so far:

• Ability to handle both data and aggregates
• Ability to handle either native or memcmp representations
• Ability to spool to disk for external sorting and scalable joins and aggregation