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/*-------------------------------------------------------------------------
*
* params.h
* Support for finding the values associated with Param nodes.
*
*
* Portions Copyright (c) 1996-2007, PostgreSQL Global Development Group
* Portions Copyright (c) 1994, Regents of the University of California
*
* $PostgreSQL: pgsql/src/include/nodes/params.h,v 1.36 2007/11/15 21:14:44 momjian Exp $
*
*-------------------------------------------------------------------------
*/
#ifndef PARAMS_H
#define PARAMS_H
/* ----------------
* ParamListInfo
*
* ParamListInfo arrays are used to pass parameters into the executor
* for parameterized plans. Each entry in the array defines the value
* to be substituted for a PARAM_EXTERN parameter. The "paramid"
* of a PARAM_EXTERN Param can range from 1 to numParams.
*
* Although parameter numbers are normally consecutive, we allow
* ptype == InvalidOid to signal an unused array entry.
*
* PARAM_FLAG_CONST signals the planner that it may treat this parameter
* as a constant (i.e., generate a plan that works only for this value
* of the parameter).
*
* Although the data structure is really an array, not a list, we keep
* the old typedef name to avoid unnecessary code changes.
* ----------------
*/
#define PARAM_FLAG_CONST 0x0001 /* parameter is constant */
typedef struct ParamExternData
{
Datum value; /* parameter value */
bool isnull; /* is it NULL? */
uint16 pflags; /* flag bits, see above */
Oid ptype; /* parameter's datatype, or 0 */
} ParamExternData;
typedef struct ParamListInfoData
{
int numParams; /* number of ParamExternDatas following */
ParamExternData params[1]; /* VARIABLE LENGTH ARRAY */
} ParamListInfoData;
typedef ParamListInfoData *ParamListInfo;
/* ----------------
* ParamExecData
*
* ParamExecData entries are used for executor internal parameters
* (that is, values being passed into or out of a sub-query). The
* paramid of a PARAM_EXEC Param is a (zero-based) index into an
* array of ParamExecData records, which is referenced through
* es_param_exec_vals or ecxt_param_exec_vals.
*
* If execPlan is not NULL, it points to a SubPlanState node that needs
* to be executed to produce the value. (This is done so that we can have
* lazy evaluation of InitPlans: they aren't executed until/unless a
* result value is needed.) Otherwise the value is assumed to be valid
* when needed.
* ----------------
*/
typedef struct ParamExecData
{
void *execPlan; /* should be "SubPlanState *" */
Datum value;
bool isnull;
} ParamExecData;
/* Functions found in src/backend/nodes/params.c */
extern ParamListInfo copyParamList(ParamListInfo from);
extern void getParamListTypes(ParamListInfo params,
Oid **param_types, int *num_params);
#endif /* PARAMS_H */
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