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/*-------------------------------------------------------------------------
*
* tupdesc.h
* POSTGRES tuple descriptor definitions.
*
*
* Portions Copyright (c) 1996-2002, PostgreSQL Global Development Group
* Portions Copyright (c) 1994, Regents of the University of California
*
* $Id: tupdesc.h,v 1.37 2002/07/20 05:16:59 momjian Exp $
*
*-------------------------------------------------------------------------
*/
#ifndef TUPDESC_H
#define TUPDESC_H
#include "access/attnum.h"
#include "catalog/pg_attribute.h"
#include "nodes/pg_list.h"
typedef struct attrDefault
{
AttrNumber adnum;
char *adbin; /* nodeToString representation of expr */
} AttrDefault;
typedef struct constrCheck
{
char *ccname;
char *ccbin; /* nodeToString representation of expr */
} ConstrCheck;
/* This structure contains constraints of a tuple */
typedef struct tupleConstr
{
AttrDefault *defval; /* array */
ConstrCheck *check; /* array */
uint16 num_defval;
uint16 num_check;
bool has_not_null;
} TupleConstr;
typedef char hasoid_t;
#define WITHOID 'C'
#define WITHOUTOID 'S'
#define UNDEFOID '?'
#define BoolToHasOid(b) ((b) ? WITHOID : WITHOUTOID)
/*
* This structure contains all information (i.e. from Classes
* pg_attribute, pg_attrdef, pg_constraint) for a tuple.
*/
typedef struct tupleDesc
{
int natts; /* Number of attributes in the tuple */
Form_pg_attribute *attrs;
/* attrs[N] is a pointer to the description of Attribute Number N+1. */
TupleConstr *constr;
hasoid_t tdhasoid; /* Tuple has an oid attribute in its header */
} *TupleDesc;
#ifdef DEBUG_TUPLE_ACCESS
#define AssertTupleDescHasOidIsValid(td) \
Assert(((td)->tdhasoid == WITHOID) || ((td)->tdhasoid == WITHOUTOID))
#define AssertTupleDescHasOid(td) \
Assert((td)->tdhasoid == WITHOID)
#define AssertTupleDescHasNoOid(td) \
Assert((td)->tdhasoid == WITHOUTOID)
#else
#define AssertTupleDescHasOidIsValid(td)
#define AssertTupleDescHasOid(td)
#define AssertTupleDescHasNoOid(td)
#endif
extern TupleDesc CreateTemplateTupleDesc(int natts, hasoid_t withoid);
extern TupleDesc CreateTupleDesc(int natts, Form_pg_attribute *attrs);
extern TupleDesc CreateTupleDescCopy(TupleDesc tupdesc);
extern TupleDesc CreateTupleDescCopyConstr(TupleDesc tupdesc);
extern void FreeTupleDesc(TupleDesc tupdesc);
extern bool equalTupleDescs(TupleDesc tupdesc1, TupleDesc tupdesc2);
extern void TupleDescInitEntry(TupleDesc desc,
AttrNumber attributeNumber,
char *attributeName,
Oid oidtypeid,
int32 typmod,
int attdim,
bool attisset);
extern TupleDesc BuildDescForRelation(List *schema);
#endif /* TUPDESC_H */
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