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📄 amapi.h(6.3 KB)
📄 amvalidate.h(1.19 KB)
📄 attnum.h(1.52 KB)
📄 brin.h(948 B)
📄 brin_internal.h(3.3 KB)
📄 brin_page.h(2.68 KB)
📄 brin_pageops.h(1.28 KB)
📄 brin_revmap.h(1.23 KB)
📄 brin_tuple.h(3.05 KB)
📄 brin_xlog.h(3.28 KB)
📄 clog.h(1.54 KB)
📄 commit_ts.h(2.09 KB)
📄 genam.h(7.31 KB)
📄 generic_xlog.h(1.42 KB)
📄 gin.h(2.3 KB)
📄 gin_private.h(33.12 KB)
📄 gist.h(6.51 KB)
📄 gist_private.h(19.82 KB)
📄 gistscan.h(729 B)
📄 hash.h(13.54 KB)
📄 heapam.h(7.76 KB)
📄 heapam_xlog.h(12.61 KB)
📄 hio.h(1.26 KB)
📄 htup.h(3.16 KB)
📄 htup_details.h(28.31 KB)
📄 itup.h(4.36 KB)
📄 multixact.h(5.13 KB)
📄 nbtree.h(30.22 KB)
📄 parallel.h(2.28 KB)
📄 printtup.h(1.03 KB)
📄 reloptions.h(8.88 KB)
📄 relscan.h(5.63 KB)
📄 rewriteheap.h(1.79 KB)
📄 rmgr.h(609 B)
📄 rmgrlist.h(2.97 KB)
📄 sdir.h(1.43 KB)
📄 skey.h(6.26 KB)
📄 slru.h(5.49 KB)
📄 spgist.h(7.04 KB)
📄 spgist_private.h(21.82 KB)
📄 stratnum.h(2.67 KB)
📄 subtrans.h(973 B)
📄 sysattr.h(890 B)
📄 timeline.h(1.59 KB)
📄 transam.h(6.29 KB)
📄 tsmapi.h(2.55 KB)
📄 tupconvert.h(1.4 KB)
📄 tupdesc.h(4.36 KB)
📄 tupmacs.h(7.16 KB)
📄 tuptoaster.h(7.18 KB)
📄 twophase.h(1.82 KB)
📄 twophase_rmgr.h(1.24 KB)
📄 valid.h(1.4 KB)
📄 visibilitymap.h(1.77 KB)
📄 xact.h(12.29 KB)
📄 xlog.h(10.91 KB)
📄 xlog_fn.h(1.41 KB)
📄 xlog_internal.h(10.29 KB)
📄 xlogdefs.h(3.11 KB)
📄 xloginsert.h(2.28 KB)
📄 xlogreader.h(7.11 KB)
📄 xlogrecord.h(7.76 KB)
📄 xlogutils.h(1.76 KB)

Editing: tsmapi.h

/*-------------------------------------------------------------------------
 *
 * tsmapi.h
 *	  API for tablesample methods
 *
 * Copyright (c) 2015-2016, PostgreSQL Global Development Group
 *
 * src/include/access/tsmapi.h
 *
 *-------------------------------------------------------------------------
 */
#ifndef TSMAPI_H
#define TSMAPI_H

#include "nodes/execnodes.h"
#include "nodes/relation.h"

/*
 * Callback function signatures --- see tablesample-method.sgml for more info.
 */

typedef void (*SampleScanGetSampleSize_function) (PlannerInfo *root,
														 RelOptInfo *baserel,
															List *paramexprs,
														  BlockNumber *pages,
															  double *tuples);

typedef void (*InitSampleScan_function) (SampleScanState *node,
													 int eflags);

typedef void (*BeginSampleScan_function) (SampleScanState *node,
													  Datum *params,
													  int nparams,
													  uint32 seed);

typedef BlockNumber (*NextSampleBlock_function) (SampleScanState *node);

typedef OffsetNumber (*NextSampleTuple_function) (SampleScanState *node,
														 BlockNumber blockno,
													 OffsetNumber maxoffset);

typedef void (*EndSampleScan_function) (SampleScanState *node);

/*
 * TsmRoutine is the struct returned by a tablesample method's handler
 * function.  It provides pointers to the callback functions needed by the
 * planner and executor, as well as additional information about the method.
 *
 * More function pointers are likely to be added in the future.
 * Therefore it's recommended that the handler initialize the struct with
 * makeNode(TsmRoutine) so that all fields are set to NULL.  This will
 * ensure that no fields are accidentally left undefined.
 */
typedef struct TsmRoutine
{
	NodeTag		type;

/* List of datatype OIDs for the arguments of the TABLESAMPLE clause */
	List	   *parameterTypes;

/* Can method produce repeatable samples across, or even within, queries? */
	bool		repeatable_across_queries;
	bool		repeatable_across_scans;

/* Functions for planning a SampleScan on a physical table */
	SampleScanGetSampleSize_function SampleScanGetSampleSize;

/* Functions for executing a SampleScan on a physical table */
	InitSampleScan_function InitSampleScan;		/* can be NULL */
	BeginSampleScan_function BeginSampleScan;
	NextSampleBlock_function NextSampleBlock;	/* can be NULL */
	NextSampleTuple_function NextSampleTuple;
	EndSampleScan_function EndSampleScan;		/* can be NULL */
} TsmRoutine;

/* Functions in access/tablesample/tablesample.c */
extern TsmRoutine *GetTsmRoutine(Oid tsmhandler);

#endif   /* TSMAPI_H */

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