mirror of https://gitee.com/bigwinds/arangodb
115 lines
4.1 KiB
C
115 lines
4.1 KiB
C
////////////////////////////////////////////////////////////////////////////////
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/// @brief order by
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///
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/// @file
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///
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/// DISCLAIMER
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///
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/// Copyright 2010-2012 triagens 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 triAGENS GmbH, Cologne, Germany
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///
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/// @author Jan Steemann
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/// @author Copyright 2012, triagens GmbH, Cologne, Germany
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////////////////////////////////////////////////////////////////////////////////
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#include "query-order.h"
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#include "V8/v8-execution.h"
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#include "VocBase/vocbase.h"
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////////////////////////////////////////////////////////////////////////////////
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/// @addtogroup VocBase
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/// @{
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////////////////////////////////////////////////////////////////////////////////
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// -----------------------------------------------------------------------------
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// --SECTION-- ORDER BY
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// -----------------------------------------------------------------------------
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////////////////////////////////////////////////////////////////////////////////
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/// @brief callback function used for order by comparisons (called by fruitsort)
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////////////////////////////////////////////////////////////////////////////////
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static int OrderDataCompareFunc (const TRI_sr_index_t* left,
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const TRI_sr_index_t* right,
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size_t size,
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void* data) {
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TRI_rc_result_t* resultState = (TRI_rc_result_t*) data;
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int result;
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assert(resultState->_orderContext);
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TRI_DefineCompareExecutionContext(resultState->_orderContext,
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resultState->_selectResult,
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(TRI_sr_documents_t*) *left,
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(TRI_sr_documents_t*) *right);
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TRI_ExecuteOrderExecutionContext(resultState->_orderContext, &result);
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return result;
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}
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////////////////////////////////////////////////////////////////////////////////
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/// @brief fruitsort initialization parameters
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///
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/// Included fsrt.inc with these parameters will create a function OrderData()
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/// that is used to do the sorting. OrderData() will call OrderDataCompareFunc()
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/// to do the actual element comparisons
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////////////////////////////////////////////////////////////////////////////////
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#define FSRT_INSTANCE Query
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#define FSRT_NAME TRI_OrderData
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#define FSRT_TYPE TRI_sr_index_t
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#define FSRT_EXTRA_ARGS result
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#define FSRT_EXTRA_DECL TRI_rc_result_t* result
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#define FSRT_COMP(l,r,s) OrderDataCompareFunc(l,r,s)
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uint32_t QueryFSRT_Rand = 0;
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static uint32_t QuerySortRandomGenerator (void) {
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return (QueryFSRT_Rand = QueryFSRT_Rand * 31415 + 27818);
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}
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#define FSRT__RAND \
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((fs_b) + FSRT__UNIT * (QuerySortRandomGenerator() % FSRT__DIST(fs_e,fs_b,FSRT__SIZE)))
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#include <BasicsC/fsrt.inc>
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////////////////////////////////////////////////////////////////////////////////
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/// @brief executes sorting
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////////////////////////////////////////////////////////////////////////////////
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void TRI_OrderDataQuery (TRI_rc_result_t* result) {
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assert(result);
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if (result->_selectResult->_numRows < 1) {
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// result set is empty, no need to sort it
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return;
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}
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TRI_OrderData(result->_selectResult->first(result->_selectResult),
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result->_selectResult->last(result->_selectResult),
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result);
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}
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////////////////////////////////////////////////////////////////////////////////
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/// @}
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////////////////////////////////////////////////////////////////////////////////
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// Local Variables:
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// mode: outline-minor
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// outline-regexp: "^\\(/// @brief\\|/// {@inheritDoc}\\|/// @addtogroup\\|// --SECTION--\\|/// @\\}\\)"
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// End:
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