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46 lines
1.2 KiB
C++
46 lines
1.2 KiB
C++
/*
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* Copyright (C) 2015-present ScyllaDB
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*/
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/*
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* SPDX-License-Identifier: LicenseRef-ScyllaDB-Source-Available-1.1
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*/
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#pragma once
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#include <seastar/core/sharded.hh>
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#include "query-result.hh"
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namespace query {
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// Merges non-overlapping results into one
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// Implements @Reducer concept from sharded.hh
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class result_merger {
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std::vector<foreign_ptr<lw_shared_ptr<query::result>>> _partial;
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const uint64_t _max_rows;
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const uint32_t _max_partitions;
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public:
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explicit result_merger(uint64_t max_rows, uint32_t max_partitions)
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: _max_rows(max_rows)
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, _max_partitions(max_partitions)
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{ }
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void reserve(size_t size) {
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_partial.reserve(size);
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}
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void operator()(foreign_ptr<lw_shared_ptr<query::result>> r) {
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if (!_partial.empty() && _partial.back()->is_short_read()) {
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return;
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}
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_partial.emplace_back(std::move(r));
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}
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// FIXME: Eventually we should return a composite_query_result here
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// which holds the vector of query results and which can be quickly turned
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// into packet fragments by the transport layer without copying the data.
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foreign_ptr<lw_shared_ptr<query::result>> get();
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};
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}
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