mirror of https://gitee.com/bigwinds/arangodb
50 lines
1.6 KiB
C++
50 lines
1.6 KiB
C++
////////////////////////////////////////////////////////////////////////////////
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/// DISCLAIMER
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///
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/// Copyright 2018-2018 ArangoDB GmbH, Cologne, Germany
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///
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/// Licensed under the Apache License, Version 2.0 (the "License");
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/// you may not use this file except in compliance with the License.
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/// You may obtain a copy of the License at
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///
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/// http://www.apache.org/licenses/LICENSE-2.0
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///
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/// Unless required by applicable law or agreed to in writing, software
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/// distributed under the License is distributed on an "AS IS" BASIS,
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/// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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/// See the License for the specific language governing permissions and
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/// limitations under the License.
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///
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/// Copyright holder is ArangoDB GmbH, Cologne, Germany
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///
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/// @author Michael Hackstein
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////////////////////////////////////////////////////////////////////////////////
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#ifndef ARANGOD_AQL_EXECUTION_STATE_H
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#define ARANGOD_AQL_EXECUTION_STATE_H 1
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#include <iosfwd>
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namespace arangodb {
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namespace aql {
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enum class ExecutionState {
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// done with this block, definitely no more results
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DONE,
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// (potentially) more results available. this may "lie" and
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// report that there are more results when in fact there are
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// none (background: to accurately determine that there are
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// more results we may need to execute expensive operations
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// on the preceeding blocks, which we want to avoid)
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HASMORE,
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// unclear if more results available or not. caller is asked
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// to try again
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WAITING
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};
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std::ostream& operator<<(std::ostream& ostream, ExecutionState state);
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} // namespace aql
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} // namespace arangodb
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#endif
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