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63006e5dd2
We want the format of query results to be eventually defined in the IDL and be independent of the format we use in memory to represent collections. This change is a step in this direction. The change decouples format of collection cells in query results from our in-memory representation. We currently use collection_mutation_view, after the change we will use CQL binary protocol format. We use that because it requires less transformations on the coordinator side. One complication is that some list operations need to retrieve keys used in list cells, not only values. To satisfy this need, new query option was added called "collections_as_maps" which will cause lists and sets to be reinterpreted as maps matching their underlying representation. This allows the coordinator to generate mutations referencing existing items in lists.