greenplumn pg_proc_callback 源码
greenplumn pg_proc_callback 代码
文件路径：/src/include/catalog/pg_proc_callback.h
/*-------------------------------------------------------------------------
*
* pg_proc_callback.h
*
* Auxillary extension to pg_proc to enable defining additional callback
* functions. Currently the list of allowable callback functions is small
* and consists of:
* - DESCRIBE() - to support more complex pseudotype resolution
*
* Portions Copyright (c) EMC, 2011
* Portions Copyright (c) 2012-Present VMware, Inc. or its affiliates.
*
*
* IDENTIFICATION
* src/include/catalog/pg_proc_callback.h
*
*-------------------------------------------------------------------------
*/
#ifndef PG_PROC_CALLBACK_H
#define PG_PROC_CALLBACK_H
#include "catalog/genbki.h"
#include "catalog/pg_proc_callback_d.h"
/* ----------------
* pg_proc_callback definition. cpp turns this into
* typedef struct FormData_pg_proc_callback
* ----------------
*/
CATALOG(pg_proc_callback,7176,ProcCallbackRelationId)
{
regproc profnoid; /* oid of the main function */
regproc procallback; /* oid of the callback function */
char promethod; /* role the callback function is performing */
} FormData_pg_proc_callback;
/* GPDB added foreign key definitions for gpcheckcat. */
FOREIGN_KEY(profnoid REFERENCES pg_proc(oid));
FOREIGN_KEY(procallback REFERENCES pg_proc(oid));
/* ----------------
* Form_pg_proc_callback corresponds to a pointer to a tuple with
* the format of pg_proc_callback relation.
* ----------------
*/
typedef FormData_pg_proc_callback *Form_pg_proc_callback;
/* values for promethod */
#define PROMETHOD_DESCRIBE 'd'
/* Functions in pg_proc_callback.c */
extern void deleteProcCallbacks(Oid profnoid);
extern void addProcCallback(Oid profnoid, Oid procallback, char promethod);
extern Oid lookupProcCallback(Oid profnoid, char promethod);
#endif
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