50 lines
1.7 KiB
C
50 lines
1.7 KiB
C
/*
|
|
* Copyright (c) 2019 TAOS Data, Inc. <jhtao@taosdata.com>
|
|
*
|
|
* This program is free software: you can use, redistribute, and/or modify
|
|
* it under the terms of the GNU Affero General Public License, version 3
|
|
* or later ("AGPL"), as published by the Free Software Foundation.
|
|
*
|
|
* This program is distributed in the hope that it will be useful, but WITHOUT
|
|
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
|
|
* FITNESS FOR A PARTICULAR PURPOSE.
|
|
*
|
|
* You should have received a copy of the GNU Affero General Public License
|
|
* along with this program. If not, see <http://www.gnu.org/licenses/>.
|
|
*/
|
|
|
|
/*
|
|
* include/tdigest.c
|
|
*
|
|
* Copyright (c) 2016, Usman Masood <usmanm at fastmail dot fm>
|
|
*/
|
|
|
|
#ifndef TDIGEST_H
|
|
#define TDIGEST_H
|
|
|
|
#include "os.h"
|
|
#include "libs/function/functionResInfo.h"
|
|
|
|
#ifndef M_PI
|
|
#define M_PI 3.14159265358979323846264338327950288 /* pi */
|
|
#endif
|
|
|
|
#define DOUBLE_MAX 1.79e+308
|
|
|
|
#define ADDITION_CENTROID_NUM 2
|
|
#define COMPRESSION 300
|
|
#define GET_CENTROID(compression) (ceil(compression * M_PI / 2) + 1 + ADDITION_CENTROID_NUM)
|
|
#define GET_THRESHOLD(compression) (7.5 + 0.37 * compression - 2e-4 * pow(compression, 2))
|
|
#define TDIGEST_SIZE(compression) \
|
|
(sizeof(TDigest) + sizeof(SCentroid) * GET_CENTROID(compression) + sizeof(SPt) * GET_THRESHOLD(compression))
|
|
|
|
TDigest *tdigestNewFrom(void *pBuf, int32_t compression);
|
|
int32_t tdigestAdd(TDigest *t, double x, int64_t w);
|
|
int32_t tdigestMerge(TDigest *t1, TDigest *t2);
|
|
double tdigestQuantile(TDigest *t, double q);
|
|
int32_t tdigestCompress(TDigest *t);
|
|
void tdigestFreeFrom(TDigest *t);
|
|
void tdigestAutoFill(TDigest *t, int32_t compression);
|
|
|
|
#endif /* TDIGEST_H */
|