Datum
currtid_byreloid(PG_FUNCTION_ARGS)
{
Oid reloid = PG_GETARG_OID(0);
ItemPointer tid = PG_GETARG_ITEMPOINTER(1);
ItemPointer result;
Relation rel;
result = (ItemPointer) palloc(sizeof(ItemPointerData));
if (!reloid)
{
*result = Current_last_tid;
PG_RETURN_ITEMPOINTER(result);
}
rel = heap_open(reloid, AccessShareLock);
if (rel->rd_rel->relkind == RELKIND_VIEW)
return currtid_for_view(rel, tid);
ItemPointerCopy(tid, result);
heap_get_latest_tid(rel, SnapshotNow, result);
heap_close(rel, AccessShareLock);
PG_RETURN_ITEMPOINTER(result);
}
Datum
currtid_byreloid(PG_FUNCTION_ARGS)
{
Oid reloid = PG_GETARG_OID(0);
ItemPointer tid = PG_GETARG_ITEMPOINTER(1);
ItemPointer result;
Relation rel;
AclResult aclresult;
result = (ItemPointer) palloc(sizeof(ItemPointerData));
if (!reloid)
{
*result = Current_last_tid;
PG_RETURN_ITEMPOINTER(result);
}
rel = heap_open(reloid, AccessShareLock);
aclresult = pg_class_aclcheck(RelationGetRelid(rel), GetUserId(),
ACL_SELECT);
if (aclresult != ACLCHECK_OK)
aclcheck_error(aclresult, ACL_KIND_CLASS,
RelationGetRelationName(rel));
if (rel->rd_rel->relkind == RELKIND_VIEW)
return currtid_for_view(rel, tid);
ItemPointerCopy(tid, result);
heap_get_latest_tid(rel, SnapshotNow, result);
heap_close(rel, AccessShareLock);
PG_RETURN_ITEMPOINTER(result);
}
Datum
currtid_byrelname(PG_FUNCTION_ARGS)
{
text *relname = PG_GETARG_TEXT_P(0);
ItemPointer tid = PG_GETARG_ITEMPOINTER(1);
ItemPointer result;
RangeVar *relrv;
Relation rel;
AclResult aclresult;
Snapshot snapshot;
relrv = makeRangeVarFromNameList(textToQualifiedNameList(relname));
rel = heap_openrv(relrv, AccessShareLock);
aclresult = pg_class_aclcheck(RelationGetRelid(rel), GetUserId(),
ACL_SELECT);
if (aclresult != ACLCHECK_OK)
aclcheck_error(aclresult, ACL_KIND_CLASS,
RelationGetRelationName(rel));
if (rel->rd_rel->relkind == RELKIND_VIEW || rel->rd_rel->relkind == RELKIND_CONTVIEW)
return currtid_for_view(rel, tid);
result = (ItemPointer) palloc(sizeof(ItemPointerData));
ItemPointerCopy(tid, result);
snapshot = RegisterSnapshot(GetLatestSnapshot());
heap_get_latest_tid(rel, snapshot, result);
UnregisterSnapshot(snapshot);
heap_close(rel, AccessShareLock);
PG_RETURN_ITEMPOINTER(result);
}
Datum
tidsmaller(PG_FUNCTION_ARGS)
{
ItemPointer arg1 = PG_GETARG_ITEMPOINTER(0);
ItemPointer arg2 = PG_GETARG_ITEMPOINTER(1);
PG_RETURN_ITEMPOINTER(ItemPointerCompare(arg1, arg2) <= 0 ? arg1 : arg2);
}
/* ----------------------------------------------------------------
* tidin
* ----------------------------------------------------------------
*/
Datum
tidin(PG_FUNCTION_ARGS)
{
char *str = PG_GETARG_CSTRING(0);
char *p,
*coord[NTIDARGS];
int i;
ItemPointer result;
BlockNumber blockNumber;
OffsetNumber offsetNumber;
char *badp;
int hold_offset;
for (i = 0, p = str; *p && i < NTIDARGS && *p != RDELIM; p++)
if (*p == DELIM || (*p == LDELIM && !i))
coord[i++] = p + 1;
if (i < NTIDARGS)
ereport(ERROR,
(errcode(ERRCODE_INVALID_TEXT_REPRESENTATION),
errmsg("invalid input syntax for type tid: \"%s\"",
str)));
errno = 0;
blockNumber = strtoul(coord[0], &badp, 10);
if (errno || *badp != DELIM)
ereport(ERROR,
(errcode(ERRCODE_INVALID_TEXT_REPRESENTATION),
errmsg("invalid input syntax for type tid: \"%s\"",
str)));
hold_offset = strtol(coord[1], &badp, 10);
if (errno || *badp != RDELIM ||
hold_offset > USHRT_MAX || hold_offset < 0)
ereport(ERROR,
(errcode(ERRCODE_INVALID_TEXT_REPRESENTATION),
errmsg("invalid input syntax for type tid: \"%s\"",
str)));
offsetNumber = hold_offset;
result = (ItemPointer) palloc(sizeof(ItemPointerData));
ItemPointerSet(result, blockNumber, offsetNumber);
PG_RETURN_ITEMPOINTER(result);
}
/*
* tidrecv - converts external binary format to tid
*/
Datum
tidrecv(PG_FUNCTION_ARGS)
{
StringInfo buf = (StringInfo) PG_GETARG_POINTER(0);
ItemPointer result;
BlockNumber blockNumber;
OffsetNumber offsetNumber;
blockNumber = pq_getmsgint(buf, sizeof(blockNumber));
offsetNumber = pq_getmsgint(buf, sizeof(offsetNumber));
result = (ItemPointer) palloc(sizeof(ItemPointerData));
ItemPointerSet(result, blockNumber, offsetNumber);
PG_RETURN_ITEMPOINTER(result);
}
Datum
currtid_byrelname(PG_FUNCTION_ARGS)
{
text *relname = PG_GETARG_TEXT_P(0);
ItemPointer tid = PG_GETARG_ITEMPOINTER(1);
ItemPointer result;
RangeVar *relrv;
Relation rel;
AclResult aclresult;
/*
* Immediately inform client that the function is not supported
*/
elog(ERROR, "Function currtid2 is not supported by GPDB");
relrv = makeRangeVarFromNameList(textToQualifiedNameList(relname));
rel = heap_openrv(relrv, AccessShareLock);
aclresult = pg_class_aclcheck(RelationGetRelid(rel), GetUserId(),
ACL_SELECT);
if (aclresult != ACLCHECK_OK)
aclcheck_error(aclresult, ACL_KIND_CLASS,
RelationGetRelationName(rel));
if (rel->rd_rel->relkind == RELKIND_VIEW)
return currtid_for_view(rel, tid);
result = (ItemPointer) palloc(sizeof(ItemPointerData));
ItemPointerCopy(tid, result);
heap_get_latest_tid(rel, SnapshotNow, result);
heap_close(rel, AccessShareLock);
PG_RETURN_ITEMPOINTER(result);
}
Datum
currtid_byrelname(PG_FUNCTION_ARGS)
{
text *relname = PG_GETARG_TEXT_P(0);
ItemPointer tid = PG_GETARG_ITEMPOINTER(1);
ItemPointer result;
RangeVar *relrv;
Relation rel;
relrv = makeRangeVarFromNameList(textToQualifiedNameList(relname,
"currtid_byrelname"));
rel = heap_openrv(relrv, AccessShareLock);
if (rel->rd_rel->relkind == RELKIND_VIEW)
return currtid_for_view(rel, tid);
result = (ItemPointer) palloc(sizeof(ItemPointerData));
ItemPointerCopy(tid, result);
heap_get_latest_tid(rel, SnapshotNow, result);
heap_close(rel, AccessShareLock);
PG_RETURN_ITEMPOINTER(result);
}
