greenplumn catalog 源码
greenplumn catalog 代码
文件路径：/src/backend/catalog/catalog.c
/*-------------------------------------------------------------------------
*
* catalog.c
* routines concerned with catalog naming conventions and other
* bits of hard-wired knowledge
*
*
* Portions Copyright (c) 1996-2019, PostgreSQL Global Development Group
* Portions Copyright (c) 1994, Regents of the University of California
*
*
* IDENTIFICATION
* src/backend/catalog/catalog.c
*
*-------------------------------------------------------------------------
*/
#include "postgres.h"
#include <fcntl.h>
#include <unistd.h>
#include "access/genam.h"
#include "access/htup_details.h"
#include "access/sysattr.h"
#include "access/table.h"
#include "access/transam.h"
#include "catalog/catalog.h"
#include "catalog/indexing.h"
#include "catalog/namespace.h"
#include "catalog/oid_dispatch.h"
#include "catalog/pg_amop.h"
#include "catalog/pg_amproc.h"
#include "catalog/pg_auth_members.h"
#include "catalog/pg_auth_time_constraint.h"
#include "catalog/pg_authid.h"
#include "catalog/pg_database.h"
#include "catalog/pg_largeobject.h"
#include "catalog/pg_namespace.h"
#include "catalog/pg_pltemplate.h"
#include "catalog/pg_db_role_setting.h"
#include "catalog/pg_replication_origin.h"
#include "catalog/pg_shdepend.h"
#include "catalog/pg_shdescription.h"
#include "catalog/pg_shseclabel.h"
#include "catalog/pg_subscription.h"
#include "catalog/pg_tablespace.h"
#include "catalog/pg_type.h"
#include "catalog/toasting.h"
#include "miscadmin.h"
#include "storage/fd.h"
#include "utils/fmgroids.h"
#include "utils/fmgrprotos.h"
#include "utils/rel.h"
#include "utils/snapmgr.h"
#include "utils/syscache.h"
#include "catalog/gp_configuration_history.h"
#include "catalog/gp_id.h"
#include "catalog/gp_version_at_initdb.h"
#include "catalog/pg_event_trigger.h"
#include "catalog/pg_largeobject_metadata.h"
#include "catalog/pg_resourcetype.h"
#include "catalog/pg_resqueue.h"
#include "catalog/pg_resqueuecapability.h"
#include "catalog/pg_resgroup.h"
#include "catalog/pg_resgroupcapability.h"
#include "catalog/pg_rewrite.h"
#include "catalog/pg_stat_last_operation.h"
#include "catalog/pg_stat_last_shoperation.h"
#include "catalog/pg_statistic.h"
#include "catalog/pg_trigger.h"
#include "cdb/cdbvars.h"
static bool IsAoSegmentClass(Form_pg_class reltuple);
/*
* Like relpath(), but gets the directory containing the data file
* and the filename separately.
*/
void
reldir_and_filename(RelFileNode node, BackendId backend, ForkNumber forknum,
char **dir, char **filename)
{
char *path;
int i;
path = relpathbackend(node, backend, forknum);
/*
* The base path is like "<path>/<rnode>". Split it into
* path and filename parts.
*/
for (i = strlen(path) - 1; i >= 0; i--)
{
if (path[i] == '/')
break;
}
if (i <= 0 || path[i] != '/')
elog(ERROR, "unexpected path: \"%s\"", path);
*dir = pnstrdup(path, i);
*filename = pstrdup(&path[i + 1]);
pfree(path);
}
/*
* Like relpathbackend(), but more convenient when dealing with
* AO relations. The filename pattern is the same as for heap
* tables, but this variant takes also 'segno' as argument.
*
* XXX This is very similar to _mdfd_segpath(), let's use that one
*/
char *
aorelpathbackend(RelFileNode node, BackendId backend, int32 segno)
{
char *fullpath;
char *path;
path = relpathbackend(node, backend, MAIN_FORKNUM);
if (segno == 0)
fullpath = path;
else
{
/* be sure we have enough space for the '.segno' */
fullpath = (char *) palloc(strlen(path) + 12);
sprintf(fullpath, "%s.%u", path, segno);
pfree(path);
}
return fullpath;
}
/*
* IsSystemRelation
* True iff the relation is either a system catalog or a toast table.
* See IsCatalogRelation for the exact definition of a system catalog.
*
* We treat toast tables of user relations as "system relations" for
* protection purposes, e.g. you can't change their schemas without
* special permissions. Therefore, most uses of this function are
* checking whether allow_system_table_mods restrictions apply.
* For other purposes, consider whether you shouldn't be using
* IsCatalogRelation instead.
*
* This function does not perform any catalog accesses.
* Some callers rely on that!
*/
bool
IsSystemRelation(Relation relation)
{
return IsSystemClass(RelationGetRelid(relation), relation->rd_rel);
}
/*
* IsSystemClass
* Like the above, but takes a Form_pg_class as argument.
* Used when we do not want to open the relation and have to
* search pg_class directly.
*/
bool
IsSystemClass(Oid relid, Form_pg_class reltuple)
{
/* IsCatalogRelationOid is a bit faster, so test that first */
return (IsCatalogRelationOid(relid) || IsToastClass(reltuple) ||
IsAoSegmentClass(reltuple));
}
/*
* IsCatalogRelation
* True iff the relation is a system catalog.
*
* By a system catalog, we mean one that is created during the bootstrap
* phase of initdb. That includes not just the catalogs per se, but
* also their indexes, and TOAST tables and indexes if any.
*
* This function does not perform any catalog accesses.
* Some callers rely on that!
*/
bool
IsCatalogRelation(Relation relation)
{
return IsCatalogRelationOid(RelationGetRelid(relation));
}
/*
* IsCatalogRelationOid
* True iff the relation identified by this OID is a system catalog.
*
* By a system catalog, we mean one that is created during the bootstrap
* phase of initdb. That includes not just the catalogs per se, but
* also their indexes, and TOAST tables and indexes if any.
*
* This function does not perform any catalog accesses.
* Some callers rely on that!
*/
bool
IsCatalogRelationOid(Oid relid)
{
/*
* We consider a relation to be a system catalog if it has an OID that was
* manually assigned or assigned by genbki.pl. This includes all the
* defined catalogs, their indexes, and their TOAST tables and indexes.
*
* This rule excludes the relations in information_schema, which are not
* integral to the system and can be treated the same as user relations.
* (Since it's valid to drop and recreate information_schema, any rule
* that did not act this way would be wrong.)
*
* This test is reliable since an OID wraparound will skip this range of
* OIDs; see GetNewObjectId().
*/
return (relid < (Oid) FirstBootstrapObjectId);
}
/*
* IsToastRelation
* True iff relation is a TOAST support relation (or index).
*
* Does not perform any catalog accesses.
*/
bool
IsToastRelation(Relation relation)
{
/*
* What we actually check is whether the relation belongs to a pg_toast
* namespace. This should be equivalent because of restrictions that are
* enforced elsewhere against creating user relations in, or moving
* relations into/out of, a pg_toast namespace. Notice also that this
* will not say "true" for toast tables belonging to other sessions' temp
* tables; we expect that other mechanisms will prevent access to those.
*/
return IsToastNamespace(RelationGetNamespace(relation));
}
/*
* IsToastClass
* Like the above, but takes a Form_pg_class as argument.
* Used when we do not want to open the relation and have to
* search pg_class directly.
*/
bool
IsToastClass(Form_pg_class reltuple)
{
Oid relnamespace = reltuple->relnamespace;
return IsToastNamespace(relnamespace);
}
/*
* IsAoSegmentClass
* Like the above, but takes a Form_pg_class as argument.
* Used when we do not want to open the relation and have to
* search pg_class directly.
*/
static bool
IsAoSegmentClass(Form_pg_class reltuple)
{
Oid relnamespace = reltuple->relnamespace;
return IsAoSegmentNamespace(relnamespace);
}
/*
* IsCatalogNamespace
* True iff namespace is pg_catalog.
*
* Does not perform any catalog accesses.
*
* NOTE: the reason this isn't a macro is to avoid having to include
* catalog/pg_namespace.h in a lot of places.
*/
bool
IsCatalogNamespace(Oid namespaceId)
{
return namespaceId == PG_CATALOG_NAMESPACE;
}
/*
* IsToastNamespace
* True iff namespace is pg_toast or my temporary-toast-table namespace.
*
* Does not perform any catalog accesses.
*
* Note: this will return false for temporary-toast-table namespaces belonging
* to other backends. Those are treated the same as other backends' regular
* temp table namespaces, and access is prevented where appropriate.
* If you need to check for those, you may be able to use isAnyTempNamespace,
* but beware that that does involve a catalog access.
*/
bool
IsToastNamespace(Oid namespaceId)
{
return (namespaceId == PG_TOAST_NAMESPACE) ||
isTempToastNamespace(namespaceId);
}
/*
* IsAoSegmentNamespace
* True iff namespace is pg_aoseg.
*
* NOTE: the reason this isn't a macro is to avoid having to include
* catalog/pg_namespace.h in a lot of places.
*/
bool
IsAoSegmentNamespace(Oid namespaceId)
{
return namespaceId == PG_AOSEGMENT_NAMESPACE;
}
/*
* IsReservedName
* True iff name starts with the pg_ prefix.
*
* For some classes of objects, the prefix pg_ is reserved for
* system objects only. As of 8.0, this was only true for
* schema and tablespace names. With 9.6, this is also true
* for roles.
*
* As of Greenplum 4.0 we also reserve the prefix gp_
*/
bool
IsReservedName(const char *name)
{
/* ugly coding for speed */
return ((name[0] == 'p' && name[1] == 'g' && name[2] == '_') ||
(name[0] == 'g' && name[1] == 'p' && name[2] == '_'));
}
/*
* GetReservedPrefix
* Given a string that is a reserved name return the portion of
* the name that makes it reserved - the reserved prefix.
*
* Current return values include "pg_" and "gp_"
*/
char *
GetReservedPrefix(const char *name)
{
char *prefix = NULL;
if (IsReservedName(name))
{
prefix = palloc(4);
memcpy(prefix, name, 3);
prefix[3] = '\0';
}
return prefix;
}
/*
* IsSharedRelation
* Given the OID of a relation, determine whether it's supposed to be
* shared across an entire database cluster.
*
* In older releases, this had to be hard-wired so that we could compute the
* locktag for a relation and lock it before examining its catalog entry.
* Since we now have MVCC catalog access, the race conditions that made that
* a hard requirement are gone, so we could look at relaxing this restriction.
* However, if we scanned the pg_class entry to find relisshared, and only
* then locked the relation, pg_class could get updated in the meantime,
* forcing us to scan the relation again, which would definitely be complex
* and might have undesirable performance consequences. Fortunately, the set
* of shared relations is fairly static, so a hand-maintained list of their
* OIDs isn't completely impractical.
*/
bool
IsSharedRelation(Oid relationId)
{
/* These are the shared catalogs (look for BKI_SHARED_RELATION) */
if (relationId == AuthIdRelationId ||
relationId == AuthMemRelationId ||
relationId == DatabaseRelationId ||
relationId == PLTemplateRelationId ||
relationId == SharedDescriptionRelationId ||
relationId == SharedDependRelationId ||
relationId == SharedSecLabelRelationId ||
relationId == TableSpaceRelationId ||
relationId == DbRoleSettingRelationId ||
relationId == ReplicationOriginRelationId ||
relationId == SubscriptionRelationId)
return true;
/* GPDB additions */
if (relationId == GpIdRelationId ||
relationId == GpVersionRelationId ||
/* MPP-6929: metadata tracking */
relationId == StatLastShOpRelationId ||
relationId == ResQueueRelationId ||
relationId == ResourceTypeRelationId ||
relationId == ResQueueCapabilityRelationId ||
relationId == ResGroupRelationId ||
relationId == ResGroupCapabilityRelationId ||
relationId == GpConfigHistoryRelationId ||
relationId == GpSegmentConfigRelationId ||
relationId == AuthTimeConstraintRelationId)
return true;
/* These are their indexes (see indexing.h) */
if (relationId == AuthIdRolnameIndexId ||
relationId == AuthIdOidIndexId ||
relationId == AuthMemRoleMemIndexId ||
relationId == AuthMemMemRoleIndexId ||
relationId == DatabaseNameIndexId ||
relationId == DatabaseOidIndexId ||
relationId == PLTemplateNameIndexId ||
relationId == SharedDescriptionObjIndexId ||
relationId == SharedDependDependerIndexId ||
relationId == SharedDependReferenceIndexId ||
relationId == SharedSecLabelObjectIndexId ||
relationId == TablespaceOidIndexId ||
relationId == TablespaceNameIndexId ||
relationId == DbRoleSettingDatidRolidIndexId ||
relationId == ReplicationOriginIdentIndex ||
relationId == ReplicationOriginNameIndex ||
relationId == SubscriptionObjectIndexId ||
relationId == SubscriptionNameIndexId)
return true;
/* GPDB added indexes */
if (/* MPP-6929: metadata tracking */
relationId == StatLastShOpClassidObjidIndexId ||
relationId == StatLastShOpClassidObjidStaactionnameIndexId ||
relationId == ResQueueOidIndexId ||
relationId == ResQueueRsqnameIndexId ||
relationId == ResourceTypeOidIndexId ||
relationId == ResourceTypeRestypidIndexId ||
relationId == ResourceTypeResnameIndexId ||
relationId == ResQueueCapabilityResqueueidIndexId ||
relationId == ResQueueCapabilityRestypidIndexId ||
relationId == ResGroupOidIndexId ||
relationId == ResGroupRsgnameIndexId ||
relationId == ResGroupCapabilityResgroupidIndexId ||
relationId == ResGroupCapabilityResgroupidResLimittypeIndexId ||
relationId == AuthIdRolResQueueIndexId ||
relationId == AuthIdRolResGroupIndexId ||
relationId == GpSegmentConfigContentPreferred_roleIndexId ||
relationId == GpSegmentConfigDbidIndexId ||
relationId == AuthTimeConstraintAuthIdIndexId)
{
return true;
}
/* These are their toast tables and toast indexes (see toasting.h) */
if (relationId == PgAuthidToastTable ||
relationId == PgAuthidToastIndex ||
relationId == PgDatabaseToastTable ||
relationId == PgDatabaseToastIndex ||
relationId == PgDbRoleSettingToastTable ||
relationId == PgDbRoleSettingToastIndex ||
relationId == PgPlTemplateToastTable ||
relationId == PgPlTemplateToastIndex ||
relationId == PgReplicationOriginToastTable ||
relationId == PgReplicationOriginToastIndex ||
relationId == PgShdescriptionToastTable ||
relationId == PgShdescriptionToastIndex ||
relationId == PgShseclabelToastTable ||
relationId == PgShseclabelToastIndex ||
relationId == PgSubscriptionToastTable ||
relationId == PgSubscriptionToastIndex ||
relationId == PgTablespaceToastTable ||
relationId == PgTablespaceToastIndex)
return true;
/* GPDB added toast tables and their indexes */
if (relationId == GpSegmentConfigToastTable ||
relationId == GpSegmentConfigToastIndex)
{
return true;
}
return false;
}
/*
* OIDs for catalog object are normally allocated in the master, and
* executor nodes should just use the OIDs passed by the master. But
* there are some exceptions.
*/
static bool
RelationNeedsSynchronizedOIDs(Relation relation)
{
if (IsCatalogNamespace(RelationGetNamespace(relation)))
{
switch(RelationGetRelid(relation))
{
/*
* pg_largeobject is more like a user table, and has
* different contents in each segment and master.
*
* Large objects don't work very consistently in GPDB. They are not
* distributed in the segments, but rather stored in the master node.
* Or actually, it depends on which node the lo_create() function
* happens to run, which isn't very deterministic.
*/
case LargeObjectRelationId:
case LargeObjectMetadataRelationId:
return false;
/*
* We don't currently synchronize the OIDs of these catalogs.
* It's a bit sketchy that we don't, but we get away with it
* because these OIDs don't appear in any of the Node structs
* that are dispatched from master to segments. (Except for the
* OIDs, the contents of these tables should be in sync.)
*/
case RewriteRelationId:
case TriggerRelationId:
return false;
/* Event triggers are only stored and fired in the QD. */
case EventTriggerRelationId:
return false;
}
/*
* All other system catalogs are assumed to need synchronized
* OIDs.
*/
return true;
}
return false;
}
/*
* GetNewOidWithIndex
* Generate a new OID that is unique within the system relation.
*
* Since the OID is not immediately inserted into the table, there is a
* race condition here; but a problem could occur only if someone else
* managed to cycle through 2^32 OIDs and generate the same OID before we
* finish inserting our row. This seems unlikely to be a problem. Note
* that if we had to *commit* the row to end the race condition, the risk
* would be rather higher; therefore we use SnapshotAny in the test, so that
* we will see uncommitted rows. (We used to use SnapshotDirty, but that has
* the disadvantage that it ignores recently-deleted rows, creating a risk
* of transient conflicts for as long as our own MVCC snapshots think a
* recently-deleted row is live. The risk is far higher when selecting TOAST
* OIDs, because SnapshotToast considers dead rows as active indefinitely.)
*
* Note that we are effectively assuming that the table has a relatively small
* number of entries (much less than 2^32) and there aren't very long runs of
* consecutive existing OIDs. This is a mostly reasonable assumption for
* system catalogs.
*
* This is exported separately because there are cases where we want to use
* an index that will not be recognized by RelationGetOidIndex: TOAST tables
* have indexes that are usable, but have multiple columns and are on
* ordinary columns rather than a true OID column. This code will work
* anyway, so long as the OID is the index's first column. The caller must
* pass in the actual heap attnum of the OID column, however.
*
* Caller must have a suitable lock on the relation.
*/
Oid
GetNewOidWithIndex(Relation relation, Oid indexId, AttrNumber oidcolumn)
{
Oid newOid;
SysScanDesc scan;
ScanKeyData key;
bool collides;
/* Only system relations are supported */
Assert(IsSystemRelation(relation));
/* In bootstrap mode, we don't have any indexes to use */
if (IsBootstrapProcessingMode())
return GetNewObjectId();
/*
* We should never be asked to generate a new pg_type OID during
* pg_upgrade; doing so would risk collisions with the OIDs it wants to
* assign. Hitting this assert means there's some path where we failed to
* ensure that a type OID is determined by commands in the dump script.
*/
Assert(!IsBinaryUpgrade || RelationGetRelid(relation) != TypeRelationId);
/* Generate new OIDs until we find one not in the table */
do
{
CHECK_FOR_INTERRUPTS();
newOid = GetNewObjectId();
ScanKeyInit(&key,
oidcolumn,
BTEqualStrategyNumber, F_OIDEQ,
ObjectIdGetDatum(newOid));
/* see notes above about using SnapshotAny */
scan = systable_beginscan(relation, indexId, true,
SnapshotAny, 1, &key);
collides = HeapTupleIsValid(systable_getnext(scan));
/* GPDB: Also check that this OID hasn't been preallocated */
if (!collides && !IsOidAcceptable(newOid))
collides = true;
systable_endscan(scan);
} while (collides);
/*
* Most catalog objects need to have the same OID in the master and all
* segments. When creating a new object, the master should allocate the
* OID and tell the segments to use the same, so segments should have no
* need to ever allocate OIDs on their own. Therefore, give a WARNING if
* GetNewOid() is called in a segment. (There are a few exceptions, see
* RelationNeedsSynchronizedOIDs()).
*/
if (Gp_role == GP_ROLE_EXECUTE && RelationNeedsSynchronizedOIDs(relation))
elog(PANIC, "allocated OID %u for relation \"%s\" in segment",
newOid, RelationGetRelationName(relation));
return newOid;
}
static bool
GpCheckRelFileCollision(RelFileNodeBackend rnode)
{
char *rpath;
bool collides;
/* Check for existing file of same name */
rpath = relpath(rnode, MAIN_FORKNUM);
if (access(rpath, F_OK) == 0)
collides = true;
else
{
/*
* Here we have a little bit of a dilemma: if errno is something
* other than ENOENT, should we declare a collision and loop? In
* practice it seems best to go ahead regardless of the errno. If
* there is a colliding file we will get an smgr failure when we
* attempt to create the new relation file.
*/
collides = false;
}
pfree(rpath);
return collides;
}
/*
* GetNewRelFileNode
* Generate a new relfilenode number that is unique within the
* database of the given tablespace.
*
* If the relfilenode will also be used as the relation's OID, pass the
* opened pg_class catalog, and this routine will guarantee that the result
* is also an unused OID within pg_class. If the result is to be used only
* as a relfilenode for an existing relation, pass NULL for pg_class.
* (in GPDB, 'pg_class' is unused, there is a different mechanism to avoid
* clashes, across the whole cluster.)
*
* As with GetNewOidWithIndex(), there is some theoretical risk of a race
* condition, but it doesn't seem worth worrying about.
*
* Note: we don't support using this in bootstrap mode. All relations
* created by bootstrap have preassigned OIDs, so there's no need.
*/
Oid
GetNewRelFileNode(Oid reltablespace, Relation pg_class, char relpersistence)
{
RelFileNodeBackend rnode;
bool collides;
BackendId backend;
/*
* If we ever get here during pg_upgrade, there's something wrong; all
* relfilenode assignments during a binary-upgrade run should be
* determined by commands in the dump script.
*
* GPDB: Totally OK in Greenplum. We don't use the table's OID as its
* initial relfilenode, and rely on this in binary upgrade, too.
*/
//Assert(!IsBinaryUpgrade);
switch (relpersistence)
{
case RELPERSISTENCE_TEMP:
backend = BackendIdForTempRelations();
break;
case RELPERSISTENCE_UNLOGGED:
case RELPERSISTENCE_PERMANENT:
backend = InvalidBackendId;
break;
default:
elog(ERROR, "invalid relpersistence: %c", relpersistence);
return InvalidOid; /* placate compiler */
}
/* This logic should match RelationInitPhysicalAddr */
rnode.node.spcNode = reltablespace ? reltablespace : MyDatabaseTableSpace;
rnode.node.dbNode = (rnode.node.spcNode == GLOBALTABLESPACE_OID) ? InvalidOid : MyDatabaseId;
/*
* The relpath will vary based on the backend ID, so we must initialize
* that properly here to make sure that any collisions based on filename
* are properly detected.
*/
rnode.backend = backend;
do
{
CHECK_FOR_INTERRUPTS();
/* Generate the Relfilenode */
rnode.node.relNode = GetNewSegRelfilenode();
if (!IsOidAcceptable(rnode.node.relNode))
continue;
collides = GpCheckRelFileCollision(rnode);
if (!collides && rnode.node.spcNode != GLOBALTABLESPACE_OID)
{
/*
* GPDB_91_MERGE_FIXME: check again for a collision with a temp
* table (if this is a normal relation) or a normal table (if this
* is a temp relation).
*
* The shared buffer manager currently assumes that relfilenodes of
* relations stored in shared buffers can't conflict, which is
* trivially true in upstream because temp tables don't use shared
* buffers at all. We have to make this additional check to make
* sure of that.
*/
rnode.backend = (backend == InvalidBackendId) ? TempRelBackendId
: InvalidBackendId;
collides = GpCheckRelFileCollision(rnode);
}
} while (collides);
elog(DEBUG1, "Calling GetNewRelFileNode returns new relfilenode = %d", rnode.node.relNode);
return rnode.node.relNode;
}
/*
* SQL callable interface for GetNewOidWithIndex(). Outside of initdb's
* direct insertions into catalog tables, and recovering from corruption, this
* should rarely be needed.
*
* Function is intentionally not documented in the user facing docs.
*/
Datum
pg_nextoid(PG_FUNCTION_ARGS)
{
Oid reloid = PG_GETARG_OID(0);
Name attname = PG_GETARG_NAME(1);
Oid idxoid = PG_GETARG_OID(2);
Relation rel;
Relation idx;
HeapTuple atttuple;
Form_pg_attribute attform;
AttrNumber attno;
Oid newoid;
/*
* As this function is not intended to be used during normal running, and
* only supports system catalogs (which require superuser permissions to
* modify), just checking for superuser ought to not obstruct valid
* usecases.
*/
if (!superuser())
ereport(ERROR,
(errcode(ERRCODE_INSUFFICIENT_PRIVILEGE),
errmsg("must be superuser to call pg_nextoid()")));
rel = table_open(reloid, RowExclusiveLock);
idx = index_open(idxoid, RowExclusiveLock);
if (!IsSystemRelation(rel))
ereport(ERROR,
(errcode(ERRCODE_INVALID_PARAMETER_VALUE),
errmsg("pg_nextoid() can only be used on system catalogs")));
if (idx->rd_index->indrelid != RelationGetRelid(rel))
ereport(ERROR,
(errcode(ERRCODE_INVALID_PARAMETER_VALUE),
errmsg("index \"%s\" does not belong to table \"%s\"",
RelationGetRelationName(idx),
RelationGetRelationName(rel))));
atttuple = SearchSysCacheAttName(reloid, NameStr(*attname));
if (!HeapTupleIsValid(atttuple))
ereport(ERROR,
(errcode(ERRCODE_UNDEFINED_COLUMN),
errmsg("column \"%s\" of relation \"%s\" does not exist",
NameStr(*attname), RelationGetRelationName(rel))));
attform = ((Form_pg_attribute) GETSTRUCT(atttuple));
attno = attform->attnum;
if (attform->atttypid != OIDOID)
ereport(ERROR,
(errcode(ERRCODE_INVALID_PARAMETER_VALUE),
errmsg("column \"%s\" is not of type oid",
NameStr(*attname))));
if (IndexRelationGetNumberOfKeyAttributes(idx) != 1 ||
idx->rd_index->indkey.values[0] != attno)
ereport(ERROR,
(errcode(ERRCODE_INVALID_PARAMETER_VALUE),
errmsg("index \"%s\" is not the index for column \"%s\"",
RelationGetRelationName(idx),
NameStr(*attname))));
newoid = GetNewOidWithIndex(rel, idxoid, attno);
ReleaseSysCache(atttuple);
table_close(rel, RowExclusiveLock);
index_close(idx, RowExclusiveLock);
return newoid;
}
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greenplumn gp_partition_template 源码
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