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📄 aclchk_internal.h(1.42 KB)
📄 array.h(18.84 KB)
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📄 help_config.h(457 B)
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📄 palloc.h(5.04 KB)
📄 pg_crc.h(3.42 KB)
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📄 pg_rusage.h(847 B)
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📄 portal.h(9.64 KB)
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📄 resowner_private.h(3.42 KB)
📄 rls.h(1.73 KB)
📄 ruleutils.h(1.2 KB)
📄 sampling.h(1.96 KB)
📄 selfuncs.h(9.39 KB)
📄 snapmgr.h(4.13 KB)
📄 snapshot.h(4.2 KB)
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📄 tzparser.h(1.13 KB)
📄 uuid.h(861 B)
📄 varbit.h(4.31 KB)
📄 xml.h(3.89 KB)

Editing: sampling.h

/*-------------------------------------------------------------------------
 *
 * sampling.h
 *	  definitions for sampling functions
 *
 * Portions Copyright (c) 1996-2016, PostgreSQL Global Development Group
 * Portions Copyright (c) 1994, Regents of the University of California
 *
 * src/include/utils/sampling.h
 *
 *-------------------------------------------------------------------------
 */
#ifndef SAMPLING_H
#define SAMPLING_H

#include "storage/block.h"		/* for typedef BlockNumber */

/* Random generator for sampling code */
typedef unsigned short SamplerRandomState[3];

extern void sampler_random_init_state(long seed,
						  SamplerRandomState randstate);
extern double sampler_random_fract(SamplerRandomState randstate);

/* Block sampling methods */

/* Data structure for Algorithm S from Knuth 3.4.2 */
typedef struct
{
	BlockNumber N;				/* number of blocks, known in advance */
	int			n;				/* desired sample size */
	BlockNumber t;				/* current block number */
	int			m;				/* blocks selected so far */
	SamplerRandomState randstate;		/* random generator state */
} BlockSamplerData;

typedef BlockSamplerData *BlockSampler;

extern void BlockSampler_Init(BlockSampler bs, BlockNumber nblocks,
				  int samplesize, long randseed);
extern bool BlockSampler_HasMore(BlockSampler bs);
extern BlockNumber BlockSampler_Next(BlockSampler bs);

/* Reservoir sampling methods */

typedef struct
{
	double		W;
	SamplerRandomState randstate;		/* random generator state */
} ReservoirStateData;

typedef ReservoirStateData *ReservoirState;

extern void reservoir_init_selection_state(ReservoirState rs, int n);
extern double reservoir_get_next_S(ReservoirState rs, double t, int n);

/* Old API, still in use by assorted FDWs */
/* For backwards compatibility, these declarations are duplicated in vacuum.h */

extern double anl_random_fract(void);
extern double anl_init_selection_state(int n);
extern double anl_get_next_S(double t, int n, double *stateptr);

#endif   /* SAMPLING_H */

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