Tomasz Grabiec 9bea6aa0a3 db: Introduce mutation query interface ...

Mutation query differs from data query in that returns information
needed to reconcile data slice with that retruned by other data
sources.

There is a generic mutation_query() algorithm introduced, which can
work with any mutation_source.

database::query_mutations() is a shard-local interface for mutation
queries.

The reconcilable_result is introduced as a medium for mutation query
results. It piggy backs on frozen_mutation as a medium for
reconcilable data.

2015-07-12 12:51:38 +02:00

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