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Name	Size	Permission	Date
access	[ DIR ]	drwxr-xr-x	2021-09-16 10:50
bootstrap	[ DIR ]	drwxr-xr-x	2021-09-16 10:50
catalog	[ DIR ]	drwxr-xr-x	2021-09-16 10:50
commands	[ DIR ]	drwxr-xr-x	2021-09-16 10:50
datatype	[ DIR ]	drwxr-xr-x	2021-09-16 10:50
executor	[ DIR ]	drwxr-xr-x	2021-09-16 10:50
foreign	[ DIR ]	drwxr-xr-x	2021-09-16 10:50
lib	[ DIR ]	drwxr-xr-x	2021-09-16 10:50
libpq	[ DIR ]	drwxr-xr-x	2021-09-16 10:50
mb	[ DIR ]	drwxr-xr-x	2021-09-16 10:50
nodes	[ DIR ]	drwxr-xr-x	2021-09-16 10:50
optimizer	[ DIR ]	drwxr-xr-x	2021-09-16 10:50
parser	[ DIR ]	drwxr-xr-x	2021-09-16 10:50
port	[ DIR ]	drwxr-xr-x	2021-09-16 10:50
portability	[ DIR ]	drwxr-xr-x	2021-09-16 10:50
postmaster	[ DIR ]	drwxr-xr-x	2021-09-16 10:50
regex	[ DIR ]	drwxr-xr-x	2021-09-16 10:50
replication	[ DIR ]	drwxr-xr-x	2021-09-16 10:50
rewrite	[ DIR ]	drwxr-xr-x	2021-09-16 10:50
snowball	[ DIR ]	drwxr-xr-x	2021-09-16 10:50
storage	[ DIR ]	drwxr-xr-x	2021-09-16 10:50
tcop	[ DIR ]	drwxr-xr-x	2021-09-16 10:50
tsearch	[ DIR ]	drwxr-xr-x	2021-09-16 10:50
utils	[ DIR ]	drwxr-xr-x	2021-09-16 10:50
c.h	24.21 KB	-rw-r--r--	2021-06-15 13:00
dynloader.h	1.09 KB	-rw-r--r--	2021-06-15 13:00
fmgr.h	29.46 KB	-rw-r--r--	2021-06-15 13:00
funcapi.h	10.24 KB	-rw-r--r--	2021-06-15 13:00
getaddrinfo.h	3.89 KB	-rw-r--r--	2021-06-15 13:00
getopt_long.h	827 B	-rw-r--r--	2021-06-15 13:00
miscadmin.h	15.46 KB	-rw-r--r--	2021-06-15 13:00
pg_config.h	1.01 KB	-rw-r--r--	2021-06-15 13:01
pg_config_manual.h	9.36 KB	-rw-r--r--	2021-06-15 13:00
pg_config_os.h	1.03 KB	-rw-r--r--	2021-06-15 13:00
pg_config_x86_64.h	26.43 KB	-rw-r--r--	2021-06-15 13:00
pg_trace.h	316 B	-rw-r--r--	2021-06-15 13:00
pgstat.h	23.94 KB	-rw-r--r--	2021-06-15 13:00
pgtar.h	682 B	-rw-r--r--	2021-06-15 13:00
pgtime.h	2.25 KB	-rw-r--r--	2021-06-15 13:00
plpgsql.h	25.74 KB	-rw-r--r--	2021-06-15 13:00
port.h	13.95 KB	-rw-r--r--	2021-06-15 13:00
postgres.h	20.07 KB	-rw-r--r--	2021-06-15 13:00
postgres_ext.h	1.74 KB	-rw-r--r--	2021-06-15 13:00
postgres_fe.h	730 B	-rw-r--r--	2021-06-15 13:00
rusagestub.h	843 B	-rw-r--r--	2021-06-15 13:00
windowapi.h	2.32 KB	-rw-r--r--	2021-06-15 13:00

Rename

/*-------------------------------------------------------------------------
 *
 * windowapi.h
 *	  API for window functions to extract data from their window
 *
 * A window function does not receive its arguments in the normal way
 * (and therefore the concept of strictness is irrelevant).  Instead it
 * receives a "WindowObject", which it can fetch with PG_WINDOW_OBJECT()
 * (note V1 calling convention must be used).  Correct call context can
 * be tested with WindowObjectIsValid().  Although argument values are
 * not passed, the call is correctly set up so that PG_NARGS() can be
 * used and argument type information can be obtained with
 * get_fn_expr_argtype(), get_fn_expr_arg_stable(), etc.
 *
 * Operations on the WindowObject allow the window function to find out
 * the current row number, total number of rows in the partition, etc
 * and to evaluate its argument expression(s) at various rows in the
 * window partition.  See the header comments for each WindowObject API
 * function in nodeWindowAgg.c for details.
 *
 *
 * Portions Copyright (c) 2000-2012, PostgreSQL Global Development Group
 *
 * src/include/windowapi.h
 *
 *-------------------------------------------------------------------------
 */
#ifndef WINDOWAPI_H
#define WINDOWAPI_H

/* values of "seektype" */
#define WINDOW_SEEK_CURRENT 0
#define WINDOW_SEEK_HEAD 1
#define WINDOW_SEEK_TAIL 2

/* this struct is private in nodeWindowAgg.c */
typedef struct WindowObjectData *WindowObject;

#define PG_WINDOW_OBJECT() ((WindowObject) fcinfo->context)

#define WindowObjectIsValid(winobj) \
	((winobj) != NULL && IsA(winobj, WindowObjectData))

extern void *WinGetPartitionLocalMemory(WindowObject winobj, Size sz);

extern int64 WinGetCurrentPosition(WindowObject winobj);
extern int64 WinGetPartitionRowCount(WindowObject winobj);

extern void WinSetMarkPosition(WindowObject winobj, int64 markpos);

extern bool WinRowsArePeers(WindowObject winobj, int64 pos1, int64 pos2);

extern Datum WinGetFuncArgInPartition(WindowObject winobj, int argno,
						 int relpos, int seektype, bool set_mark,
						 bool *isnull, bool *isout);

extern Datum WinGetFuncArgInFrame(WindowObject winobj, int argno,
					 int relpos, int seektype, bool set_mark,
					 bool *isnull, bool *isout);

extern Datum WinGetFuncArgCurrent(WindowObject winobj, int argno,
					 bool *isnull);

#endif   /* WINDOWAPI_H */