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9eab5bca27
It is important that all replicas participating in a read use the same memory limits to avoid artificial differences due to different amount of results. The coordinator now passes down its own memory limit for reads, in the form of max_result_size (or max_size). For unpaged or reverse queries this has to be used now instead of the locally set max_memory_unlimited_query configuration item. To avoid the replicas accidentally using the local limit contained in the `query_class_config` returned from `database::make_query_class_config()`, we refactor the latter into `database::get_reader_concurrency_semaphore()`. Most of its callers were only interested in the semaphore only anyway and those that were interested in the limit as well should get it from the coordinator instead, so this refactoring is a win-win.