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/*-------------------------------------------------------------------------
*
* dest.h--
* Whenever the backend is submitted a query, the results
* have to go someplace - either to the standard output,
* to a local portal buffer or to a remote portal buffer.
*
* - stdout is the destination only when we are running a
* backend without a postmaster and are returning results
* back to the user.
*
* - a local portal buffer is the destination when a backend
* executes a user-defined function which calls PQexec() or
* PQfn(). In this case, the results are collected into a
* PortalBuffer which the user's function may diddle with.
*
* - a remote portal buffer is the destination when we are
* running a backend with a frontend and the frontend executes
* PQexec() or PQfn(). In this case, the results are sent
* to the frontend via the pq_ functions.
*
* - None is the destination when the system executes
* a query internally. This is not used now but it may be
* useful for the parallel optimiser/executor.
*
*
* Copyright (c) 1994, Regents of the University of California
*
* $Id: dest.h,v 1.4 1996/11/10 03:06:08 momjian Exp $
*
*-------------------------------------------------------------------------
*/
#ifndef DEST_H
#define DEST_H
#include <access/tupdesc.h>
/* ----------------
* CommandDest is used to allow the results of calling
* pg_eval() to go to the right place.
* ----------------
*/
typedef enum {
None, /* results are discarded */
Debug, /* results go to debugging output */
Local, /* results go in local portal buffer */
Remote, /* results sent to frontend process */
CopyBegin, /* results sent to frontend process but are strings */
CopyEnd, /* results sent to frontend process but are strings */
RemoteInternal /* results sent to frontend process in internal
(binary) form */
} CommandDest;
/* AttrInfo* replaced with TupleDesc, now that TupleDesc also has within it
the number of attributes
typedef struct AttrInfo {
int numAttr;
AttributeTupleForm *attrs;
} AttrInfo;
*/
extern void donothing(List *tuple, List *attrdesc);
extern void (*DestToFunction(CommandDest dest))();
extern void EndCommand(char *commandTag, CommandDest dest);
extern void SendCopyBegin(void);
extern void ReceiveCopyBegin(void);
extern void NullCommand(CommandDest dest);
extern void BeginCommand(char *pname, int operation, TupleDesc attinfo,
bool isIntoRel, bool isIntoPortal, char *tag,
CommandDest dest);
extern void ResetAppendOid(void);
extern void UpdateAppendOid(Oid newoid);
extern Oid GetAppendOid(void);
#endif /* DEST_H */
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