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Consolidate tables of known system attributes into one table.

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This commit is contained in:
Tom Lane
2001-10-22 22:47:57 +00:00
parent b00c6c841f
commit c59839ac6d
3 changed files with 47 additions and 70 deletions
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68
src/backend/parser/parse_relation.c
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@ -8,7 +8,7 @@
*
*
* IDENTIFICATION
* $Header: /cvsroot/pgsql/src/backend/parser/parse_relation.c,v 1.56 2001/08/10 18:57:37 tgl Exp $
* $Header: /cvsroot/pgsql/src/backend/parser/parse_relation.c,v 1.57 2001/10/22 22:47:57 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@ -18,6 +18,7 @@
#include "access/heapam.h"
#include "access/htup.h"
#include "catalog/heap.h"
#include "catalog/pg_type.h"
#include "nodes/makefuncs.h"
#include "parser/parsetree.h"
@ -43,43 +44,6 @@ static int specialAttNum(char *a);
static void warnAutoRange(ParseState *pstate, char *refname);
/*
* Information defining the "system" attributes of every relation.
*/
static struct
{
char *attrname; /* name of system attribute */
int attrnum; /* its attribute number (always < 0) */
Oid attrtype; /* its type id */
} special_attr[] =
{
{
"ctid", SelfItemPointerAttributeNumber, TIDOID
},
{
"oid", ObjectIdAttributeNumber, OIDOID
},
{
"xmin", MinTransactionIdAttributeNumber, XIDOID
},
{
"cmin", MinCommandIdAttributeNumber, CIDOID
},
{
"xmax", MaxTransactionIdAttributeNumber, XIDOID
},
{
"cmax", MaxCommandIdAttributeNumber, CIDOID
},
{
"tableoid", TableOidAttributeNumber, OIDOID
}
};
#define SPECIALS ((int) lengthof(special_attr))
/*
* refnameRangeOrJoinEntry
* Given a refname, look to see if it matches any RTE or join table.
@ -1001,39 +965,31 @@ attnameAttNum(Relation rd, char *a)
static int
specialAttNum(char *a)
{
int i;
for (i = 0; i < SPECIALS; i++)
if (strcmp(special_attr[i].attrname, a) == 0)
return special_attr[i].attrnum;
Form_pg_attribute sysatt;
sysatt = SystemAttributeByName(a, true /* "oid" will be accepted */);
if (sysatt != NULL)
return sysatt->attnum;
return InvalidAttrNumber;
}
/* given attribute id, return type of that attribute */
/*
* given attribute id, return type of that attribute
*
* This should only be used if the relation is already
* heap_open()'ed. Use the cache version get_atttype()
* for access to non-opened relations.
*
* Note: we don't bother to check rd->rd_rel->relhasoids; we assume that
* the caller will only ask about OID if that column has been found valid.
*/
Oid
attnumTypeId(Relation rd, int attid)
{
if (attid < 0)
if (attid <= 0)
{
int i;
Form_pg_attribute sysatt;
for (i = 0; i < SPECIALS; i++)
{
if (special_attr[i].attrnum == attid)
return special_attr[i].attrtype;
}
/* negative but not a valid system attr? */
elog(ERROR, "attnumTypeId: bogus attribute number %d", attid);
sysatt = SystemAttributeDefinition(attid, rd->rd_rel->relhasoids);
return sysatt->atttypid;
}
/*