82 lines
2.2 KiB
C
82 lines
2.2 KiB
C
/*
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* Copyright (c) 2019 TAOS Data, Inc. <jhtao@taosdata.com>
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*
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* This program is free software: you can use, redistribute, and/or modify
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* it under the terms of the GNU Affero General Public License, version 3
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* or later ("AGPL"), as published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE.
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*
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* You should have received a copy of the GNU Affero General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#ifndef TDENGINE_TPERCENTILE_H
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#define TDENGINE_TPERCENTILE_H
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#ifdef __cplusplus
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extern "C" {
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#endif
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#include "tpagedbuf.h"
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#include "ttszip.h"
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typedef struct MinMaxEntry {
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union {
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double dMinVal;
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int64_t i64MinVal;
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uint64_t u64MinVal;
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};
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union {
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double dMaxVal;
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int64_t i64MaxVal;
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int64_t u64MaxVal;
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};
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} MinMaxEntry;
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typedef struct {
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int32_t size;
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int32_t pageId;
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SFilePage *data;
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} SSlotInfo;
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typedef struct tMemBucketSlot {
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SSlotInfo info;
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MinMaxEntry range;
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} tMemBucketSlot;
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struct tMemBucket;
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typedef int32_t (*__perc_hash_func_t)(struct tMemBucket *pBucket, const void *value);
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typedef struct tMemBucket {
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int16_t numOfSlots;
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int16_t type;
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int16_t bytes;
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int32_t total;
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int32_t elemPerPage; // number of elements for each object
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int32_t maxCapacity; // maximum allowed number of elements that can be sort directly to get the result
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int32_t bufPageSize; // disk page size
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MinMaxEntry range; // value range
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int32_t times; // count that has been checked for deciding the correct data value buckets.
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__compar_fn_t comparFn;
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tMemBucketSlot * pSlots;
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SDiskbasedBuf *pBuffer;
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__perc_hash_func_t hashFunc;
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} tMemBucket;
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tMemBucket *tMemBucketCreate(int16_t nElemSize, int16_t dataType, double minval, double maxval);
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void tMemBucketDestroy(tMemBucket *pBucket);
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int32_t tMemBucketPut(tMemBucket *pBucket, const void *data, size_t size);
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double getPercentile(tMemBucket *pMemBucket, double percent);
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#endif // TDENGINE_TPERCENTILE_H
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#ifdef __cplusplus
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}
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#endif |