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Refactor SPI_cursor_open/SPI_cursor_open_with_args so that the latter sets

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the PARAM_FLAG_CONST flag on the parameters that are passed into the portal,
while the former's behavior is unchanged.  This should only affect the case
where the portal is executing an EXPLAIN; it will cause the generated plan to
look more like what would be generated if the portal were actually executing
the command being explained.  Per gripe from Pavel.
REL8_5_ALPHA1_BRANCH
Tom Lane 18 years ago
parent 6d19e9ffad
commit 6a9fffcd0d
1 changed files with 80 additions and 60 deletions
Show all changes Ignore whitespace when comparing lines Ignore changes in amount of whitespace Ignore changes in whitespace at EOL
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  1. 140
      src/backend/executor/spi.c

140
src/backend/executor/spi.c
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@ -8,7 +8,7 @@
*
*
* IDENTIFICATION
* $PostgreSQL: pgsql/src/backend/executor/spi.c,v 1.195 2008/05/12 20:02:00 alvherre Exp $
* $PostgreSQL: pgsql/src/backend/executor/spi.c,v 1.196 2008/06/01 17:32:48 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@ -36,6 +36,10 @@ static int _SPI_stack_depth = 0; /* allocated size of _SPI_stack */
static int _SPI_connected = -1;
static int _SPI_curid = -1;
static Portal SPI_cursor_open_internal(const char *name, SPIPlanPtr plan,
Datum *Values, const char *Nulls,
bool read_only, int pflags);
static void _SPI_prepare_plan(const char *src, SPIPlanPtr plan,
ParamListInfo boundParams);
@ -916,6 +920,80 @@ Portal
SPI_cursor_open(const char *name, SPIPlanPtr plan,
Datum *Values, const char *Nulls,
bool read_only)
{
return SPI_cursor_open_internal(name, plan, Values, Nulls,
read_only, 0);
}
/*
* SPI_cursor_open_with_args()
*
* Parse and plan a query and open it as a portal. Like SPI_execute_with_args,
* we can tell the planner to rely on the parameter values as constants,
* because the plan will only be used once.
*/
Portal
SPI_cursor_open_with_args(const char *name,
const char *src,
int nargs, Oid *argtypes,
Datum *Values, const char *Nulls,
bool read_only, int cursorOptions)
{
Portal result;
_SPI_plan plan;
ParamListInfo paramLI;
if (src == NULL || nargs < 0)
elog(ERROR, "SPI_cursor_open_with_args called with invalid arguments");
if (nargs > 0 && (argtypes == NULL || Values == NULL))
elog(ERROR, "SPI_cursor_open_with_args called with missing parameters");
SPI_result = _SPI_begin_call(true);
if (SPI_result < 0)
elog(ERROR, "SPI_cursor_open_with_args called while not connected");
memset(&plan, 0, sizeof(_SPI_plan));
plan.magic = _SPI_PLAN_MAGIC;
plan.cursor_options = cursorOptions;
plan.nargs = nargs;
plan.argtypes = argtypes;
paramLI = _SPI_convert_params(nargs, argtypes,
Values, Nulls,
PARAM_FLAG_CONST);
_SPI_prepare_plan(src, &plan, paramLI);
/* We needn't copy the plan; SPI_cursor_open_internal will do so */
/* Adjust stack so that SPI_cursor_open_internal doesn't complain */
_SPI_curid--;
/* SPI_cursor_open_internal must be called in procedure memory context */
_SPI_procmem();
result = SPI_cursor_open_internal(name, &plan, Values, Nulls,
read_only, PARAM_FLAG_CONST);
/* And clean up */
_SPI_curid++;
_SPI_end_call(true);
return result;
}
/*
* SPI_cursor_open_internal()
*
* Common code for SPI_cursor_open and SPI_cursor_open_with_args
*/
static Portal
SPI_cursor_open_internal(const char *name, SPIPlanPtr plan,
Datum *Values, const char *Nulls,
bool read_only, int pflags)
{
CachedPlanSource *plansource;
CachedPlan *cplan;
@ -997,7 +1075,7 @@ SPI_cursor_open(const char *name, SPIPlanPtr plan,
ParamExternData *prm = &paramLI->params[k];
prm->ptype = plan->argtypes[k];
prm->pflags = 0;
prm->pflags = pflags;
prm->isnull = (Nulls && Nulls[k] == 'n');
if (prm->isnull)
{
@ -1129,64 +1207,6 @@ SPI_cursor_open(const char *name, SPIPlanPtr plan,
}
/*
* SPI_cursor_open_with_args()
*
* Parse and plan a query and open it as a portal. Like SPI_execute_with_args,
* we can tell the planner to rely on the parameter values as constants,
* because the plan will only be used once.
*/
Portal
SPI_cursor_open_with_args(const char *name,
const char *src,
int nargs, Oid *argtypes,
Datum *Values, const char *Nulls,
bool read_only, int cursorOptions)
{
Portal result;
_SPI_plan plan;
ParamListInfo paramLI;
if (src == NULL || nargs < 0)
elog(ERROR, "SPI_cursor_open_with_args called with invalid arguments");
if (nargs > 0 && (argtypes == NULL || Values == NULL))
elog(ERROR, "SPI_cursor_open_with_args called with missing parameters");
SPI_result = _SPI_begin_call(true);
if (SPI_result < 0)
elog(ERROR, "SPI_cursor_open_with_args called while not connected");
memset(&plan, 0, sizeof(_SPI_plan));
plan.magic = _SPI_PLAN_MAGIC;
plan.cursor_options = cursorOptions;
plan.nargs = nargs;
plan.argtypes = argtypes;
paramLI = _SPI_convert_params(nargs, argtypes,
Values, Nulls,
PARAM_FLAG_CONST);
_SPI_prepare_plan(src, &plan, paramLI);
/* We needn't copy the plan; SPI_cursor_open will do so */
/* Adjust stack so that SPI_cursor_open doesn't complain */
_SPI_curid--;
/* SPI_cursor_open expects to be called in procedure memory context */
_SPI_procmem();
result = SPI_cursor_open(name, &plan, Values, Nulls, read_only);
/* And clean up */
_SPI_curid++;
_SPI_end_call(true);
return result;
}
/*
* SPI_cursor_find()
*

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