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Restructure command destination handling so that we pass around

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DestReceiver pointers instead of just CommandDest values.  The DestReceiver
is made at the point where the destination is selected, rather than
deep inside the executor.  This cleans up the original kluge implementation
of tstoreReceiver.c, and makes it easy to support retrieving results
from utility statements inside portals.  Thus, you can now do fun things
like Bind and Execute a FETCH or EXPLAIN command, and it'll all work
as expected (e.g., you can Describe the portal, or use Execute's count
parameter to suspend the output partway through).  Implementation involves
stuffing the utility command's output into a Tuplestore, which would be
kind of annoying for huge output sets, but should be quite acceptable
for typical uses of utility commands.
This commit is contained in:
Tom Lane
2003-05-06 20:26:28 +00:00
parent 299fbb4b37
commit 79913910d4
28 changed files with 698 additions and 349 deletions
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71
src/backend/access/common/printtup.c
View File

@ -2,14 +2,14 @@
*
* printtup.c
* Routines to print out tuples to the destination (both frontend
* clients and interactive backends are supported here).
* clients and standalone backends are supported here).
*
*
* Portions Copyright (c) 1996-2002, PostgreSQL Global Development Group
* Portions Copyright (c) 1994, Regents of the University of California
*
* IDENTIFICATION
* $Header: /cvsroot/pgsql/src/backend/access/common/printtup.c,v 1.69 2003/05/06 00:20:31 tgl Exp $
* $Header: /cvsroot/pgsql/src/backend/access/common/printtup.c,v 1.70 2003/05/06 20:26:26 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@ -22,11 +22,13 @@
#include "utils/lsyscache.h"
static void printtup_setup(DestReceiver *self, int operation,
static void printtup_startup(DestReceiver *self, int operation,
const char *portalName, TupleDesc typeinfo, List *targetlist);
static void printtup(HeapTuple tuple, TupleDesc typeinfo, DestReceiver *self);
static void printtup_internal(HeapTuple tuple, TupleDesc typeinfo, DestReceiver *self);
static void printtup_cleanup(DestReceiver *self);
static void printtup_shutdown(DestReceiver *self);
static void printtup_destroy(DestReceiver *self);
/* ----------------------------------------------------------------
* printtup / debugtup support
@ -59,13 +61,41 @@ typedef struct
* ----------------
*/
DestReceiver *
printtup_create_DR(bool isBinary, bool sendDescrip)
printtup_create_DR(CommandDest dest)
{
DR_printtup *self = (DR_printtup *) palloc(sizeof(DR_printtup));
bool isBinary;
bool sendDescrip;
switch (dest)
{
case Remote:
isBinary = false;
sendDescrip = true;
break;
case RemoteInternal:
isBinary = true;
sendDescrip = true;
break;
case RemoteExecute:
isBinary = false;
sendDescrip = false; /* no T message for Execute */
break;
case RemoteExecuteInternal:
isBinary = true;
sendDescrip = false; /* no T message for Execute */
break;
default:
elog(ERROR, "printtup_create_DR: unsupported dest");
return NULL;
}
self->pub.receiveTuple = isBinary ? printtup_internal : printtup;
self->pub.setup = printtup_setup;
self->pub.cleanup = printtup_cleanup;
self->pub.startup = printtup_startup;
self->pub.shutdown = printtup_shutdown;
self->pub.destroy = printtup_destroy;
self->pub.mydest = dest;
self->sendDescrip = sendDescrip;
@ -77,8 +107,8 @@ printtup_create_DR(bool isBinary, bool sendDescrip)
}
static void
printtup_setup(DestReceiver *self, int operation,
const char *portalName, TupleDesc typeinfo, List *targetlist)
printtup_startup(DestReceiver *self, int operation,
const char *portalName, TupleDesc typeinfo, List *targetlist)
{
DR_printtup *myState = (DR_printtup *) self;
@ -288,17 +318,28 @@ printtup(HeapTuple tuple, TupleDesc typeinfo, DestReceiver *self)
}
/* ----------------
* printtup_cleanup
* printtup_shutdown
* ----------------
*/
static void
printtup_cleanup(DestReceiver *self)
printtup_shutdown(DestReceiver *self)
{
DR_printtup *myState = (DR_printtup *) self;
if (myState->myinfo)
pfree(myState->myinfo);
pfree(myState);
myState->myinfo = NULL;
myState->attrinfo = NULL;
}
/* ----------------
* printtup_destroy
* ----------------
*/
static void
printtup_destroy(DestReceiver *self)
{
pfree(self);
}
/* ----------------
@ -340,12 +381,12 @@ showatts(const char *name, TupleDesc tupleDesc)
}
/* ----------------
* debugSetup - prepare to print tuples for an interactive backend
* debugStartup - prepare to print tuples for an interactive backend
* ----------------
*/
void
debugSetup(DestReceiver *self, int operation,
const char *portalName, TupleDesc typeinfo, List *targetlist)
debugStartup(DestReceiver *self, int operation,
const char *portalName, TupleDesc typeinfo, List *targetlist)
{
/*
* show the return type of the tuples