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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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43
src/backend/utils/misc/guc.c
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@@ -10,7 +10,7 @@
* Written by Peter Eisentraut <peter_e@gmx.net>.
*
* IDENTIFICATION
* $Header: /cvsroot/pgsql/src/backend/utils/misc/guc.c,v 1.122 2003/05/02 22:02:47 momjian Exp $
* $Header: /cvsroot/pgsql/src/backend/utils/misc/guc.c,v 1.123 2003/05/06 20:26:27 tgl Exp $
*
*--------------------------------------------------------------------
*/
@@ -2438,12 +2438,41 @@ set_config_by_name(PG_FUNCTION_ARGS)
* SHOW command
*/
void
GetPGVariable(const char *name)
GetPGVariable(const char *name, DestReceiver *dest)
{
if (strcasecmp(name, "all") == 0)
ShowAllGUCConfig();
ShowAllGUCConfig(dest);
else
ShowGUCConfigOption(name);
ShowGUCConfigOption(name, dest);
}
TupleDesc
GetPGVariableResultDesc(const char *name)
{
TupleDesc tupdesc;
if (strcasecmp(name, "all") == 0)
{
/* need a tuple descriptor representing two TEXT columns */
tupdesc = CreateTemplateTupleDesc(2, false);
TupleDescInitEntry(tupdesc, (AttrNumber) 1, "name",
TEXTOID, -1, 0, false);
TupleDescInitEntry(tupdesc, (AttrNumber) 2, "setting",
TEXTOID, -1, 0, false);
}
else
{
const char *varname;
/* Get the canonical spelling of name */
(void) GetConfigOptionByName(name, &varname);
/* need a tuple descriptor representing a single TEXT column */
tupdesc = CreateTemplateTupleDesc(1, false);
TupleDescInitEntry(tupdesc, (AttrNumber) 1, (char *) varname,
TEXTOID, -1, 0, false);
}
return tupdesc;
}
/*
@@ -2468,11 +2497,10 @@ ResetPGVariable(const char *name)
* SHOW command
*/
void
ShowGUCConfigOption(const char *name)
ShowGUCConfigOption(const char *name, DestReceiver *dest)
{
TupOutputState *tstate;
TupleDesc tupdesc;
CommandDest dest = whereToSendOutput;
const char *varname;
char *value;
@@ -2497,12 +2525,11 @@ ShowGUCConfigOption(const char *name)
* SHOW ALL command
*/
void
ShowAllGUCConfig(void)
ShowAllGUCConfig(DestReceiver *dest)
{
int i;
TupOutputState *tstate;
TupleDesc tupdesc;
CommandDest dest = whereToSendOutput;
char *values[2];
/* need a tuple descriptor representing two TEXT columns */