On 27.02.24 08:57, Alvaro Herrera wrote:
On 2024-Feb-27, Michael Paquier wrote:

These would cause compilation failures.  Saying that, this is a very
nice cleanup, so I've fixed these and applied the patch after checking
that the one-one replacements were correct.

Oh, I thought we were going to get rid of ObjectClass altogether -- I
mean, have getObjectClass() return ObjectAddress->classId, and then
define the OCLASS values for each catalog OID [... tries to ...]  But
this(*) doesn't work for two reasons:

I have long wondered what the point of ObjectClass is. I find the extra layer of redirection, which is used only in small parts of the code, and the similarity to ObjectType confusing. I happened to have a draft patch for its removal lying around, so I'll show it here, rebased over what has already been done in this thread.

1. some switches processing the OCLASS enum don't have "default:" cases.
This is so that the compiler tells us when we fail to add support for
some new object class (and it's been helpful).  If we were to

I think you can also handle that with some assertions and proper test coverage. It's not even clear how strong this benefit is. For example, in AlterObjectNamespace_oid(), you could still put a new OCLASS into the "ignore object types that don't have schema-qualified names" case, and it might or might not be wrong. Also, there are already various OCLASS switches that do have a default case, so it's not even clear what the preferred coding style should be.

2. all users of getObjectClass would have to include the catalog header
specific to every catalog it wants to handle; so tablecmds.c and
dependency.c would have to include almost all catalog includes, for
example.

This doesn't seem to be a problem in practice; see patch.
From c3acb638301b7a00d18baaf464c29f742734629a Mon Sep 17 00:00:00 2001
From: Peter Eisentraut <pe...@eisentraut.org>
Date: Thu, 29 Feb 2024 12:06:15 +0100
Subject: [PATCH] Remove ObjectClass

---
 src/backend/catalog/dependency.c    | 223 +++-----------------
 src/backend/catalog/objectaddress.c | 311 ++++++++++++----------------
 src/backend/commands/alter.c        |  73 ++-----
 src/backend/commands/tablecmds.c    |  60 ++----
 src/include/catalog/dependency.h    |  51 -----
 5 files changed, 188 insertions(+), 530 deletions(-)

diff --git a/src/backend/catalog/dependency.c b/src/backend/catalog/dependency.c
index 192dedb3cb..d6a5d1d185 100644
--- a/src/backend/catalog/dependency.c
+++ b/src/backend/catalog/dependency.c
@@ -1351,9 +1351,9 @@ deleteOneObject(const ObjectAddress *object, Relation 
*depRel, int flags)
 static void
 doDeletion(const ObjectAddress *object, int flags)
 {
-       switch (getObjectClass(object))
+       switch (object->classId)
        {
-               case OCLASS_CLASS:
+               case RelationRelationId:
                        {
                                char            relKind = 
get_rel_relkind(object->objectId);
 
@@ -1384,104 +1384,80 @@ doDeletion(const ObjectAddress *object, int flags)
                                break;
                        }
 
-               case OCLASS_PROC:
+               case ProcedureRelationId:
                        RemoveFunctionById(object->objectId);
                        break;
 
-               case OCLASS_TYPE:
+               case TypeRelationId:
                        RemoveTypeById(object->objectId);
                        break;
 
-               case OCLASS_CONSTRAINT:
+               case ConstraintRelationId:
                        RemoveConstraintById(object->objectId);
                        break;
 
-               case OCLASS_DEFAULT:
+               case AttrDefaultRelationId:
                        RemoveAttrDefaultById(object->objectId);
                        break;
 
-               case OCLASS_LARGEOBJECT:
+               case LargeObjectRelationId:
                        LargeObjectDrop(object->objectId);
                        break;
 
-               case OCLASS_OPERATOR:
+               case OperatorRelationId:
                        RemoveOperatorById(object->objectId);
                        break;
 
-               case OCLASS_REWRITE:
+               case RewriteRelationId:
                        RemoveRewriteRuleById(object->objectId);
                        break;
 
-               case OCLASS_TRIGGER:
+               case TriggerRelationId:
                        RemoveTriggerById(object->objectId);
                        break;
 
-               case OCLASS_STATISTIC_EXT:
+               case StatisticExtRelationId:
                        RemoveStatisticsById(object->objectId);
                        break;
 
-               case OCLASS_TSCONFIG:
+               case TSConfigRelationId:
                        RemoveTSConfigurationById(object->objectId);
                        break;
 
-               case OCLASS_EXTENSION:
+               case ExtensionRelationId:
                        RemoveExtensionById(object->objectId);
                        break;
 
-               case OCLASS_POLICY:
+               case PolicyRelationId:
                        RemovePolicyById(object->objectId);
                        break;
 
-               case OCLASS_PUBLICATION_NAMESPACE:
+               case PublicationNamespaceRelationId:
                        RemovePublicationSchemaById(object->objectId);
                        break;
 
-               case OCLASS_PUBLICATION_REL:
+               case PublicationRelRelationId:
                        RemovePublicationRelById(object->objectId);
                        break;
 
-               case OCLASS_PUBLICATION:
+               case PublicationRelationId:
                        RemovePublicationById(object->objectId);
                        break;
 
-               case OCLASS_CAST:
-               case OCLASS_COLLATION:
-               case OCLASS_CONVERSION:
-               case OCLASS_LANGUAGE:
-               case OCLASS_OPCLASS:
-               case OCLASS_OPFAMILY:
-               case OCLASS_AM:
-               case OCLASS_AMOP:
-               case OCLASS_AMPROC:
-               case OCLASS_SCHEMA:
-               case OCLASS_TSPARSER:
-               case OCLASS_TSDICT:
-               case OCLASS_TSTEMPLATE:
-               case OCLASS_FDW:
-               case OCLASS_FOREIGN_SERVER:
-               case OCLASS_USER_MAPPING:
-               case OCLASS_DEFACL:
-               case OCLASS_EVENT_TRIGGER:
-               case OCLASS_TRANSFORM:
-               case OCLASS_ROLE_MEMBERSHIP:
-                       DropObjectById(object);
-                       break;
-
                        /*
                         * These global object types are not supported here.
                         */
-               case OCLASS_ROLE:
-               case OCLASS_DATABASE:
-               case OCLASS_TBLSPACE:
-               case OCLASS_SUBSCRIPTION:
-               case OCLASS_PARAMETER_ACL:
-                       elog(ERROR, "global objects cannot be deleted by 
doDeletion");
+               case AuthIdRelationId:
+               case DatabaseRelationId:
+               case TableSpaceRelationId:
+               case SubscriptionRelationId:
+               case ParameterAclRelationId:
+                       elog(ERROR, "object in class %u cannot be deleted by 
doDeletion", object->classId);
                        break;
 
-                       /*
-                        * There's intentionally no default: case here; we want 
the
-                        * compiler to warn if a new OCLASS hasn't been handled 
above.
-                        */
+               default:
+                       DropObjectById(object);
+                       break;
        }
 }
 
@@ -2776,153 +2752,6 @@ free_object_addresses(ObjectAddresses *addrs)
        pfree(addrs);
 }
 
-/*
- * Determine the class of a given object identified by objectAddress.
- *
- * We implement it as a function instead of an array because the OIDs aren't
- * consecutive.
- */
-ObjectClass
-getObjectClass(const ObjectAddress *object)
-{
-       /* only pg_class entries can have nonzero objectSubId */
-       if (object->classId != RelationRelationId &&
-               object->objectSubId != 0)
-               elog(ERROR, "invalid non-zero objectSubId for object class %u",
-                        object->classId);
-
-       switch (object->classId)
-       {
-               case RelationRelationId:
-                       /* caller must check objectSubId */
-                       return OCLASS_CLASS;
-
-               case ProcedureRelationId:
-                       return OCLASS_PROC;
-
-               case TypeRelationId:
-                       return OCLASS_TYPE;
-
-               case CastRelationId:
-                       return OCLASS_CAST;
-
-               case CollationRelationId:
-                       return OCLASS_COLLATION;
-
-               case ConstraintRelationId:
-                       return OCLASS_CONSTRAINT;
-
-               case ConversionRelationId:
-                       return OCLASS_CONVERSION;
-
-               case AttrDefaultRelationId:
-                       return OCLASS_DEFAULT;
-
-               case LanguageRelationId:
-                       return OCLASS_LANGUAGE;
-
-               case LargeObjectRelationId:
-                       return OCLASS_LARGEOBJECT;
-
-               case OperatorRelationId:
-                       return OCLASS_OPERATOR;
-
-               case OperatorClassRelationId:
-                       return OCLASS_OPCLASS;
-
-               case OperatorFamilyRelationId:
-                       return OCLASS_OPFAMILY;
-
-               case AccessMethodRelationId:
-                       return OCLASS_AM;
-
-               case AccessMethodOperatorRelationId:
-                       return OCLASS_AMOP;
-
-               case AccessMethodProcedureRelationId:
-                       return OCLASS_AMPROC;
-
-               case RewriteRelationId:
-                       return OCLASS_REWRITE;
-
-               case TriggerRelationId:
-                       return OCLASS_TRIGGER;
-
-               case NamespaceRelationId:
-                       return OCLASS_SCHEMA;
-
-               case StatisticExtRelationId:
-                       return OCLASS_STATISTIC_EXT;
-
-               case TSParserRelationId:
-                       return OCLASS_TSPARSER;
-
-               case TSDictionaryRelationId:
-                       return OCLASS_TSDICT;
-
-               case TSTemplateRelationId:
-                       return OCLASS_TSTEMPLATE;
-
-               case TSConfigRelationId:
-                       return OCLASS_TSCONFIG;
-
-               case AuthIdRelationId:
-                       return OCLASS_ROLE;
-
-               case AuthMemRelationId:
-                       return OCLASS_ROLE_MEMBERSHIP;
-
-               case DatabaseRelationId:
-                       return OCLASS_DATABASE;
-
-               case TableSpaceRelationId:
-                       return OCLASS_TBLSPACE;
-
-               case ForeignDataWrapperRelationId:
-                       return OCLASS_FDW;
-
-               case ForeignServerRelationId:
-                       return OCLASS_FOREIGN_SERVER;
-
-               case UserMappingRelationId:
-                       return OCLASS_USER_MAPPING;
-
-               case DefaultAclRelationId:
-                       return OCLASS_DEFACL;
-
-               case ExtensionRelationId:
-                       return OCLASS_EXTENSION;
-
-               case EventTriggerRelationId:
-                       return OCLASS_EVENT_TRIGGER;
-
-               case ParameterAclRelationId:
-                       return OCLASS_PARAMETER_ACL;
-
-               case PolicyRelationId:
-                       return OCLASS_POLICY;
-
-               case PublicationNamespaceRelationId:
-                       return OCLASS_PUBLICATION_NAMESPACE;
-
-               case PublicationRelationId:
-                       return OCLASS_PUBLICATION;
-
-               case PublicationRelRelationId:
-                       return OCLASS_PUBLICATION_REL;
-
-               case SubscriptionRelationId:
-                       return OCLASS_SUBSCRIPTION;
-
-               case TransformRelationId:
-                       return OCLASS_TRANSFORM;
-       }
-
-       /* shouldn't get here */
-       elog(ERROR, "unrecognized object class: %u", object->classId);
-       return OCLASS_CLASS;            /* keep compiler quiet */
-}
-
 /*
  * delete initial ACL for extension objects
  */
diff --git a/src/backend/catalog/objectaddress.c 
b/src/backend/catalog/objectaddress.c
index 8bb2924b9c..8a2a313df3 100644
--- a/src/backend/catalog/objectaddress.c
+++ b/src/backend/catalog/objectaddress.c
@@ -658,7 +658,6 @@ static const struct object_type_map
 
                        ObjectTypeMap[] =
 {
-       /* OCLASS_CLASS, all kinds of relations */
        {
                "table", OBJECT_TABLE
        },
@@ -707,7 +706,6 @@ static const struct object_type_map
        {
                "foreign table column", OBJECT_COLUMN
        },
-       /* OCLASS_PROC */
        {
                "aggregate", OBJECT_AGGREGATE
        },
@@ -717,162 +715,123 @@ static const struct object_type_map
        {
                "procedure", OBJECT_PROCEDURE
        },
-       /* OCLASS_TYPE */
        {
                "type", OBJECT_TYPE
        },
-       /* OCLASS_CAST */
        {
                "cast", OBJECT_CAST
        },
-       /* OCLASS_COLLATION */
        {
                "collation", OBJECT_COLLATION
        },
-       /* OCLASS_CONSTRAINT */
        {
                "table constraint", OBJECT_TABCONSTRAINT
        },
        {
                "domain constraint", OBJECT_DOMCONSTRAINT
        },
-       /* OCLASS_CONVERSION */
        {
                "conversion", OBJECT_CONVERSION
        },
-       /* OCLASS_DEFAULT */
        {
                "default value", OBJECT_DEFAULT
        },
-       /* OCLASS_LANGUAGE */
        {
                "language", OBJECT_LANGUAGE
        },
-       /* OCLASS_LARGEOBJECT */
        {
                "large object", OBJECT_LARGEOBJECT
        },
-       /* OCLASS_OPERATOR */
        {
                "operator", OBJECT_OPERATOR
        },
-       /* OCLASS_OPCLASS */
        {
                "operator class", OBJECT_OPCLASS
        },
-       /* OCLASS_OPFAMILY */
        {
                "operator family", OBJECT_OPFAMILY
        },
-       /* OCLASS_AM */
        {
                "access method", OBJECT_ACCESS_METHOD
        },
-       /* OCLASS_AMOP */
        {
                "operator of access method", OBJECT_AMOP
        },
-       /* OCLASS_AMPROC */
        {
                "function of access method", OBJECT_AMPROC
        },
-       /* OCLASS_REWRITE */
        {
                "rule", OBJECT_RULE
        },
-       /* OCLASS_TRIGGER */
        {
                "trigger", OBJECT_TRIGGER
        },
-       /* OCLASS_SCHEMA */
        {
                "schema", OBJECT_SCHEMA
        },
-       /* OCLASS_TSPARSER */
        {
                "text search parser", OBJECT_TSPARSER
        },
-       /* OCLASS_TSDICT */
        {
                "text search dictionary", OBJECT_TSDICTIONARY
        },
-       /* OCLASS_TSTEMPLATE */
        {
                "text search template", OBJECT_TSTEMPLATE
        },
-       /* OCLASS_TSCONFIG */
        {
                "text search configuration", OBJECT_TSCONFIGURATION
        },
-       /* OCLASS_ROLE */
        {
                "role", OBJECT_ROLE
        },
-       /* OCLASS_ROLE_MEMBERSHIP */
        {
                "role membership", -1   /* unmapped */
        },
-       /* OCLASS_DATABASE */
        {
                "database", OBJECT_DATABASE
        },
-       /* OCLASS_TBLSPACE */
        {
                "tablespace", OBJECT_TABLESPACE
        },
-       /* OCLASS_FDW */
        {
                "foreign-data wrapper", OBJECT_FDW
        },
-       /* OCLASS_FOREIGN_SERVER */
        {
                "server", OBJECT_FOREIGN_SERVER
        },
-       /* OCLASS_USER_MAPPING */
        {
                "user mapping", OBJECT_USER_MAPPING
        },
-       /* OCLASS_DEFACL */
        {
                "default acl", OBJECT_DEFACL
        },
-       /* OCLASS_EXTENSION */
        {
                "extension", OBJECT_EXTENSION
        },
-       /* OCLASS_EVENT_TRIGGER */
        {
                "event trigger", OBJECT_EVENT_TRIGGER
        },
-       /* OCLASS_PARAMETER_ACL */
        {
                "parameter ACL", OBJECT_PARAMETER_ACL
        },
-       /* OCLASS_POLICY */
        {
                "policy", OBJECT_POLICY
        },
-       /* OCLASS_PUBLICATION */
        {
                "publication", OBJECT_PUBLICATION
        },
-       /* OCLASS_PUBLICATION_NAMESPACE */
        {
                "publication namespace", OBJECT_PUBLICATION_NAMESPACE
        },
-       /* OCLASS_PUBLICATION_REL */
        {
                "publication relation", OBJECT_PUBLICATION_REL
        },
-       /* OCLASS_SUBSCRIPTION */
        {
                "subscription", OBJECT_SUBSCRIPTION
        },
-       /* OCLASS_TRANSFORM */
        {
                "transform", OBJECT_TRANSFORM
        },
-       /* OCLASS_STATISTIC_EXT */
        {
                "statistics object", OBJECT_STATISTIC_EXT
        }
@@ -2925,9 +2884,9 @@ getObjectDescription(const ObjectAddress *object, bool 
missing_ok)
 
        initStringInfo(&buffer);
 
-       switch (getObjectClass(object))
+       switch (object->classId)
        {
-               case OCLASS_CLASS:
+               case RelationRelationId:
                        if (object->objectSubId == 0)
                                getRelationDescription(&buffer, 
object->objectId, missing_ok);
                        else
@@ -2950,7 +2909,7 @@ getObjectDescription(const ObjectAddress *object, bool 
missing_ok)
                        }
                        break;
 
-               case OCLASS_PROC:
+               case ProcedureRelationId:
                        {
                                bits16          flags = 
FORMAT_PROC_INVALID_AS_NULL;
                                char       *proname = 
format_procedure_extended(object->objectId,
@@ -2963,7 +2922,7 @@ getObjectDescription(const ObjectAddress *object, bool 
missing_ok)
                                break;
                        }
 
-               case OCLASS_TYPE:
+               case TypeRelationId:
                        {
                                bits16          flags = 
FORMAT_TYPE_INVALID_AS_NULL;
                                char       *typname = 
format_type_extended(object->objectId, -1,
@@ -2976,7 +2935,7 @@ getObjectDescription(const ObjectAddress *object, bool 
missing_ok)
                                break;
                        }
 
-               case OCLASS_CAST:
+               case CastRelationId:
                        {
                                Relation        castDesc;
                                ScanKeyData skey[1];
@@ -3018,7 +2977,7 @@ getObjectDescription(const ObjectAddress *object, bool 
missing_ok)
                                break;
                        }
 
-               case OCLASS_COLLATION:
+               case CollationRelationId:
                        {
                                HeapTuple       collTup;
                                Form_pg_collation coll;
@@ -3049,7 +3008,7 @@ getObjectDescription(const ObjectAddress *object, bool 
missing_ok)
                                break;
                        }
 
-               case OCLASS_CONSTRAINT:
+               case ConstraintRelationId:
                        {
                                HeapTuple       conTup;
                                Form_pg_constraint con;
@@ -3087,7 +3046,7 @@ getObjectDescription(const ObjectAddress *object, bool 
missing_ok)
                                break;
                        }
 
-               case OCLASS_CONVERSION:
+               case ConversionRelationId:
                        {
                                HeapTuple       conTup;
                                Form_pg_conversion conv;
@@ -3118,7 +3077,7 @@ getObjectDescription(const ObjectAddress *object, bool 
missing_ok)
                                break;
                        }
 
-               case OCLASS_DEFAULT:
+               case AttrDefaultRelationId:
                        {
                                ObjectAddress colobject;
 
@@ -3138,7 +3097,7 @@ getObjectDescription(const ObjectAddress *object, bool 
missing_ok)
                                break;
                        }
 
-               case OCLASS_LANGUAGE:
+               case LanguageRelationId:
                        {
                                char       *langname = 
get_language_name(object->objectId,
                                                                                
                                 missing_ok);
@@ -3149,14 +3108,14 @@ getObjectDescription(const ObjectAddress *object, bool 
missing_ok)
                                break;
                        }
 
-               case OCLASS_LARGEOBJECT:
+               case LargeObjectRelationId:
                        if (!LargeObjectExists(object->objectId))
                                break;
                        appendStringInfo(&buffer, _("large object %u"),
                                                         object->objectId);
                        break;
 
-               case OCLASS_OPERATOR:
+               case OperatorRelationId:
                        {
                                bits16          flags = 
FORMAT_OPERATOR_INVALID_AS_NULL;
                                char       *oprname = 
format_operator_extended(object->objectId,
@@ -3169,7 +3128,7 @@ getObjectDescription(const ObjectAddress *object, bool 
missing_ok)
                                break;
                        }
 
-               case OCLASS_OPCLASS:
+               case OperatorClassRelationId:
                        {
                                HeapTuple       opcTup;
                                Form_pg_opclass opcForm;
@@ -3212,11 +3171,11 @@ getObjectDescription(const ObjectAddress *object, bool 
missing_ok)
                                break;
                        }
 
-               case OCLASS_OPFAMILY:
+               case OperatorFamilyRelationId:
                        getOpFamilyDescription(&buffer, object->objectId, 
missing_ok);
                        break;
 
-               case OCLASS_AM:
+               case AccessMethodRelationId:
                        {
                                HeapTuple       tup;
 
@@ -3236,7 +3195,7 @@ getObjectDescription(const ObjectAddress *object, bool 
missing_ok)
                                break;
                        }
 
-               case OCLASS_AMOP:
+               case AccessMethodOperatorRelationId:
                        {
                                Relation        amopDesc;
                                HeapTuple       tup;
@@ -3293,7 +3252,7 @@ getObjectDescription(const ObjectAddress *object, bool 
missing_ok)
                                break;
                        }
 
-               case OCLASS_AMPROC:
+               case AccessMethodProcedureRelationId:
                        {
                                Relation        amprocDesc;
                                ScanKeyData skey[1];
@@ -3350,7 +3309,7 @@ getObjectDescription(const ObjectAddress *object, bool 
missing_ok)
                                break;
                        }
 
-               case OCLASS_REWRITE:
+               case RewriteRelationId:
                        {
                                Relation        ruleDesc;
                                ScanKeyData skey[1];
@@ -3396,7 +3355,7 @@ getObjectDescription(const ObjectAddress *object, bool 
missing_ok)
                                break;
                        }
 
-               case OCLASS_TRIGGER:
+               case TriggerRelationId:
                        {
                                Relation        trigDesc;
                                ScanKeyData skey[1];
@@ -3442,7 +3401,7 @@ getObjectDescription(const ObjectAddress *object, bool 
missing_ok)
                                break;
                        }
 
-               case OCLASS_SCHEMA:
+               case NamespaceRelationId:
                        {
                                char       *nspname;
 
@@ -3458,7 +3417,7 @@ getObjectDescription(const ObjectAddress *object, bool 
missing_ok)
                                break;
                        }
 
-               case OCLASS_STATISTIC_EXT:
+               case StatisticExtRelationId:
                        {
                                HeapTuple       stxTup;
                                Form_pg_statistic_ext stxForm;
@@ -3490,7 +3449,7 @@ getObjectDescription(const ObjectAddress *object, bool 
missing_ok)
                                break;
                        }
 
-               case OCLASS_TSPARSER:
+               case TSParserRelationId:
                        {
                                HeapTuple       tup;
                                Form_pg_ts_parser prsForm;
@@ -3520,7 +3479,7 @@ getObjectDescription(const ObjectAddress *object, bool 
missing_ok)
                                break;
                        }
 
-               case OCLASS_TSDICT:
+               case TSDictionaryRelationId:
                        {
                                HeapTuple       tup;
                                Form_pg_ts_dict dictForm;
@@ -3551,7 +3510,7 @@ getObjectDescription(const ObjectAddress *object, bool 
missing_ok)
                                break;
                        }
 
-               case OCLASS_TSTEMPLATE:
+               case TSTemplateRelationId:
                        {
                                HeapTuple       tup;
                                Form_pg_ts_template tmplForm;
@@ -3582,7 +3541,7 @@ getObjectDescription(const ObjectAddress *object, bool 
missing_ok)
                                break;
                        }
 
-               case OCLASS_TSCONFIG:
+               case TSConfigRelationId:
                        {
                                HeapTuple       tup;
                                Form_pg_ts_config cfgForm;
@@ -3613,7 +3572,7 @@ getObjectDescription(const ObjectAddress *object, bool 
missing_ok)
                                break;
                        }
 
-               case OCLASS_ROLE:
+               case AuthIdRelationId:
                        {
                                char       *username = 
GetUserNameFromId(object->objectId,
                                                                                
                                 missing_ok);
@@ -3623,7 +3582,7 @@ getObjectDescription(const ObjectAddress *object, bool 
missing_ok)
                                break;
                        }
 
-               case OCLASS_ROLE_MEMBERSHIP:
+               case AuthMemRelationId:
                        {
                                Relation        amDesc;
                                ScanKeyData skey[1];
@@ -3665,7 +3624,7 @@ getObjectDescription(const ObjectAddress *object, bool 
missing_ok)
                                break;
                        }
 
-               case OCLASS_DATABASE:
+               case DatabaseRelationId:
                        {
                                char       *datname;
 
@@ -3681,7 +3640,7 @@ getObjectDescription(const ObjectAddress *object, bool 
missing_ok)
                                break;
                        }
 
-               case OCLASS_TBLSPACE:
+               case TableSpaceRelationId:
                        {
                                char       *tblspace;
 
@@ -3697,7 +3656,7 @@ getObjectDescription(const ObjectAddress *object, bool 
missing_ok)
                                break;
                        }
 
-               case OCLASS_FDW:
+               case ForeignDataWrapperRelationId:
                        {
                                ForeignDataWrapper *fdw;
 
@@ -3708,7 +3667,7 @@ getObjectDescription(const ObjectAddress *object, bool 
missing_ok)
                                break;
                        }
 
-               case OCLASS_FOREIGN_SERVER:
+               case ForeignServerRelationId:
                        {
                                ForeignServer *srv;
 
@@ -3718,7 +3677,7 @@ getObjectDescription(const ObjectAddress *object, bool 
missing_ok)
                                break;
                        }
 
-               case OCLASS_USER_MAPPING:
+               case UserMappingRelationId:
                        {
                                HeapTuple       tup;
                                Oid                     useid;
@@ -3752,7 +3711,7 @@ getObjectDescription(const ObjectAddress *object, bool 
missing_ok)
                                break;
                        }
 
-               case OCLASS_DEFACL:
+               case DefaultAclRelationId:
                        {
                                Relation        defaclrel;
                                ScanKeyData skey[1];
@@ -3860,7 +3819,7 @@ getObjectDescription(const ObjectAddress *object, bool 
missing_ok)
                                break;
                        }
 
-               case OCLASS_EXTENSION:
+               case ExtensionRelationId:
                        {
                                char       *extname;
 
@@ -3876,7 +3835,7 @@ getObjectDescription(const ObjectAddress *object, bool 
missing_ok)
                                break;
                        }
 
-               case OCLASS_EVENT_TRIGGER:
+               case EventTriggerRelationId:
                        {
                                HeapTuple       tup;
 
@@ -3895,7 +3854,7 @@ getObjectDescription(const ObjectAddress *object, bool 
missing_ok)
                                break;
                        }
 
-               case OCLASS_PARAMETER_ACL:
+               case ParameterAclRelationId:
                        {
                                HeapTuple       tup;
                                Datum           nameDatum;
@@ -3918,7 +3877,7 @@ getObjectDescription(const ObjectAddress *object, bool 
missing_ok)
                                break;
                        }
 
-               case OCLASS_POLICY:
+               case PolicyRelationId:
                        {
                                Relation        policy_rel;
                                ScanKeyData skey[1];
@@ -3964,7 +3923,7 @@ getObjectDescription(const ObjectAddress *object, bool 
missing_ok)
                                break;
                        }
 
-               case OCLASS_PUBLICATION:
+               case PublicationRelationId:
                        {
                                char       *pubname = 
get_publication_name(object->objectId,
                                                                                
                                   missing_ok);
@@ -3974,7 +3933,7 @@ getObjectDescription(const ObjectAddress *object, bool 
missing_ok)
                                break;
                        }
 
-               case OCLASS_PUBLICATION_NAMESPACE:
+               case PublicationNamespaceRelationId:
                        {
                                char       *pubname;
                                char       *nspname;
@@ -3990,7 +3949,7 @@ getObjectDescription(const ObjectAddress *object, bool 
missing_ok)
                                break;
                        }
 
-               case OCLASS_PUBLICATION_REL:
+               case PublicationRelRelationId:
                        {
                                HeapTuple       tup;
                                char       *pubname;
@@ -4021,7 +3980,7 @@ getObjectDescription(const ObjectAddress *object, bool 
missing_ok)
                                break;
                        }
 
-               case OCLASS_SUBSCRIPTION:
+               case SubscriptionRelationId:
                        {
                                char       *subname = 
get_subscription_name(object->objectId,
                                                                                
                                        missing_ok);
@@ -4031,7 +3990,7 @@ getObjectDescription(const ObjectAddress *object, bool 
missing_ok)
                                break;
                        }
 
-               case OCLASS_TRANSFORM:
+               case TransformRelationId:
                        {
                                HeapTuple       trfTup;
                                Form_pg_transform trfForm;
@@ -4055,16 +4014,14 @@ getObjectDescription(const ObjectAddress *object, bool 
missing_ok)
                                ReleaseSysCache(trfTup);
                                break;
                        }
-
-                       /*
-                        * There's intentionally no default: case here; we want 
the
-                        * compiler to warn if a new OCLASS hasn't been handled 
above.
-                        */
        }
 
        /* an empty buffer is equivalent to no object found */
        if (buffer.len == 0)
+       {
+               Assert(missing_ok);
                return NULL;
+       }
 
        return buffer.data;
 }
@@ -4421,180 +4378,175 @@ getObjectTypeDescription(const ObjectAddress *object, 
bool missing_ok)
 
        initStringInfo(&buffer);
 
-       switch (getObjectClass(object))
+       switch (object->classId)
        {
-               case OCLASS_CLASS:
+               case RelationRelationId:
                        getRelationTypeDescription(&buffer, object->objectId,
                                                                           
object->objectSubId,
                                                                           
missing_ok);
                        break;
 
-               case OCLASS_PROC:
+               case ProcedureRelationId:
                        getProcedureTypeDescription(&buffer, object->objectId,
                                                                                
missing_ok);
                        break;
 
-               case OCLASS_TYPE:
+               case TypeRelationId:
                        appendStringInfoString(&buffer, "type");
                        break;
 
-               case OCLASS_CAST:
+               case CastRelationId:
                        appendStringInfoString(&buffer, "cast");
                        break;
 
-               case OCLASS_COLLATION:
+               case CollationRelationId:
                        appendStringInfoString(&buffer, "collation");
                        break;
 
-               case OCLASS_CONSTRAINT:
+               case ConstraintRelationId:
                        getConstraintTypeDescription(&buffer, object->objectId,
                                                                                
 missing_ok);
                        break;
 
-               case OCLASS_CONVERSION:
+               case ConversionRelationId:
                        appendStringInfoString(&buffer, "conversion");
                        break;
 
-               case OCLASS_DEFAULT:
+               case AttrDefaultRelationId:
                        appendStringInfoString(&buffer, "default value");
                        break;
 
-               case OCLASS_LANGUAGE:
+               case LanguageRelationId:
                        appendStringInfoString(&buffer, "language");
                        break;
 
-               case OCLASS_LARGEOBJECT:
+               case LargeObjectRelationId:
                        appendStringInfoString(&buffer, "large object");
                        break;
 
-               case OCLASS_OPERATOR:
+               case OperatorRelationId:
                        appendStringInfoString(&buffer, "operator");
                        break;
 
-               case OCLASS_OPCLASS:
+               case OperatorClassRelationId:
                        appendStringInfoString(&buffer, "operator class");
                        break;
 
-               case OCLASS_OPFAMILY:
+               case OperatorFamilyRelationId:
                        appendStringInfoString(&buffer, "operator family");
                        break;
 
-               case OCLASS_AM:
+               case AccessMethodRelationId:
                        appendStringInfoString(&buffer, "access method");
                        break;
 
-               case OCLASS_AMOP:
+               case AccessMethodOperatorRelationId:
                        appendStringInfoString(&buffer, "operator of access 
method");
                        break;
 
-               case OCLASS_AMPROC:
+               case AccessMethodProcedureRelationId:
                        appendStringInfoString(&buffer, "function of access 
method");
                        break;
 
-               case OCLASS_REWRITE:
+               case RewriteRelationId:
                        appendStringInfoString(&buffer, "rule");
                        break;
 
-               case OCLASS_TRIGGER:
+               case TriggerRelationId:
                        appendStringInfoString(&buffer, "trigger");
                        break;
 
-               case OCLASS_SCHEMA:
+               case NamespaceRelationId:
                        appendStringInfoString(&buffer, "schema");
                        break;
 
-               case OCLASS_STATISTIC_EXT:
+               case StatisticExtRelationId:
                        appendStringInfoString(&buffer, "statistics object");
                        break;
 
-               case OCLASS_TSPARSER:
+               case TSParserRelationId:
                        appendStringInfoString(&buffer, "text search parser");
                        break;
 
-               case OCLASS_TSDICT:
+               case TSDictionaryRelationId:
                        appendStringInfoString(&buffer, "text search 
dictionary");
                        break;
 
-               case OCLASS_TSTEMPLATE:
+               case TSTemplateRelationId:
                        appendStringInfoString(&buffer, "text search template");
                        break;
 
-               case OCLASS_TSCONFIG:
+               case TSConfigRelationId:
                        appendStringInfoString(&buffer, "text search 
configuration");
                        break;
 
-               case OCLASS_ROLE:
+               case AuthIdRelationId:
                        appendStringInfoString(&buffer, "role");
                        break;
 
-               case OCLASS_ROLE_MEMBERSHIP:
+               case AuthMemRelationId:
                        appendStringInfoString(&buffer, "role membership");
                        break;
 
-               case OCLASS_DATABASE:
+               case DatabaseRelationId:
                        appendStringInfoString(&buffer, "database");
                        break;
 
-               case OCLASS_TBLSPACE:
+               case TableSpaceRelationId:
                        appendStringInfoString(&buffer, "tablespace");
                        break;
 
-               case OCLASS_FDW:
+               case ForeignDataWrapperRelationId:
                        appendStringInfoString(&buffer, "foreign-data wrapper");
                        break;
 
-               case OCLASS_FOREIGN_SERVER:
+               case ForeignServerRelationId:
                        appendStringInfoString(&buffer, "server");
                        break;
 
-               case OCLASS_USER_MAPPING:
+               case UserMappingRelationId:
                        appendStringInfoString(&buffer, "user mapping");
                        break;
 
-               case OCLASS_DEFACL:
+               case DefaultAclRelationId:
                        appendStringInfoString(&buffer, "default acl");
                        break;
 
-               case OCLASS_EXTENSION:
+               case ExtensionRelationId:
                        appendStringInfoString(&buffer, "extension");
                        break;
 
-               case OCLASS_EVENT_TRIGGER:
+               case EventTriggerRelationId:
                        appendStringInfoString(&buffer, "event trigger");
                        break;
 
-               case OCLASS_PARAMETER_ACL:
+               case ParameterAclRelationId:
                        appendStringInfoString(&buffer, "parameter ACL");
                        break;
 
-               case OCLASS_POLICY:
+               case PolicyRelationId:
                        appendStringInfoString(&buffer, "policy");
                        break;
 
-               case OCLASS_PUBLICATION:
+               case PublicationRelationId:
                        appendStringInfoString(&buffer, "publication");
                        break;
 
-               case OCLASS_PUBLICATION_NAMESPACE:
+               case PublicationNamespaceRelationId:
                        appendStringInfoString(&buffer, "publication 
namespace");
                        break;
 
-               case OCLASS_PUBLICATION_REL:
+               case PublicationRelRelationId:
                        appendStringInfoString(&buffer, "publication relation");
                        break;
 
-               case OCLASS_SUBSCRIPTION:
+               case SubscriptionRelationId:
                        appendStringInfoString(&buffer, "subscription");
                        break;
 
-               case OCLASS_TRANSFORM:
+               case TransformRelationId:
                        appendStringInfoString(&buffer, "transform");
                        break;
-
-                       /*
-                        * There's intentionally no default: case here; we want 
the
-                        * compiler to warn if a new OCLASS hasn't been handled 
above.
-                        */
        }
 
        /* the result can never be empty */
@@ -4780,9 +4732,9 @@ getObjectIdentityParts(const ObjectAddress *object,
                *objargs = NIL;
        }
 
-       switch (getObjectClass(object))
+       switch (object->classId)
        {
-               case OCLASS_CLASS:
+               case RelationRelationId:
                        {
                                char       *attr = NULL;
 
@@ -4815,7 +4767,7 @@ getObjectIdentityParts(const ObjectAddress *object,
                        }
                        break;
 
-               case OCLASS_PROC:
+               case ProcedureRelationId:
                        {
                                bits16          flags = 
FORMAT_PROC_FORCE_QUALIFY | FORMAT_PROC_INVALID_AS_NULL;
                                char       *proname = 
format_procedure_extended(object->objectId,
@@ -4831,7 +4783,7 @@ getObjectIdentityParts(const ObjectAddress *object,
                                break;
                        }
 
-               case OCLASS_TYPE:
+               case TypeRelationId:
                        {
                                bits16          flags = 
FORMAT_TYPE_INVALID_AS_NULL | FORMAT_TYPE_FORCE_QUALIFY;
                                char       *typeout;
@@ -4847,7 +4799,7 @@ getObjectIdentityParts(const ObjectAddress *object,
                        }
                        break;
 
-               case OCLASS_CAST:
+               case CastRelationId:
                        {
                                Relation        castRel;
                                HeapTuple       tup;
@@ -4884,7 +4836,7 @@ getObjectIdentityParts(const ObjectAddress *object,
                                break;
                        }
 
-               case OCLASS_COLLATION:
+               case CollationRelationId:
                        {
                                HeapTuple       collTup;
                                Form_pg_collation coll;
@@ -4911,7 +4863,7 @@ getObjectIdentityParts(const ObjectAddress *object,
                                break;
                        }
 
-               case OCLASS_CONSTRAINT:
+               case ConstraintRelationId:
                        {
                                HeapTuple       conTup;
                                Form_pg_constraint con;
@@ -4958,7 +4910,7 @@ getObjectIdentityParts(const ObjectAddress *object,
                                break;
                        }
 
-               case OCLASS_CONVERSION:
+               case ConversionRelationId:
                        {
                                HeapTuple       conTup;
                                Form_pg_conversion conForm;
@@ -4985,7 +4937,7 @@ getObjectIdentityParts(const ObjectAddress *object,
                                break;
                        }
 
-               case OCLASS_DEFAULT:
+               case AttrDefaultRelationId:
                        {
                                ObjectAddress colobject;
 
@@ -5006,7 +4958,7 @@ getObjectIdentityParts(const ObjectAddress *object,
                                break;
                        }
 
-               case OCLASS_LANGUAGE:
+               case LanguageRelationId:
                        {
                                HeapTuple       langTup;
                                Form_pg_language langForm;
@@ -5028,7 +4980,8 @@ getObjectIdentityParts(const ObjectAddress *object,
                                ReleaseSysCache(langTup);
                                break;
                        }
-               case OCLASS_LARGEOBJECT:
+
+               case LargeObjectRelationId:
                        if (!LargeObjectExists(object->objectId))
                                break;
                        appendStringInfo(&buffer, "%u",
@@ -5037,7 +4990,7 @@ getObjectIdentityParts(const ObjectAddress *object,
                                *objname = list_make1(psprintf("%u", 
object->objectId));
                        break;
 
-               case OCLASS_OPERATOR:
+               case OperatorRelationId:
                        {
                                bits16          flags = 
FORMAT_OPERATOR_FORCE_QUALIFY | FORMAT_OPERATOR_INVALID_AS_NULL;
                                char       *oprname = 
format_operator_extended(object->objectId,
@@ -5052,7 +5005,7 @@ getObjectIdentityParts(const ObjectAddress *object,
                                break;
                        }
 
-               case OCLASS_OPCLASS:
+               case OperatorClassRelationId:
                        {
                                HeapTuple       opcTup;
                                Form_pg_opclass opcForm;
@@ -5093,12 +5046,12 @@ getObjectIdentityParts(const ObjectAddress *object,
                                break;
                        }
 
-               case OCLASS_OPFAMILY:
+               case OperatorFamilyRelationId:
                        getOpFamilyIdentity(&buffer, object->objectId, objname,
                                                                missing_ok);
                        break;
 
-               case OCLASS_AM:
+               case AccessMethodRelationId:
                        {
                                char       *amname;
 
@@ -5116,7 +5069,7 @@ getObjectIdentityParts(const ObjectAddress *object,
                        }
                        break;
 
-               case OCLASS_AMOP:
+               case AccessMethodOperatorRelationId:
                        {
                                Relation        amopDesc;
                                HeapTuple       tup;
@@ -5178,7 +5131,7 @@ getObjectIdentityParts(const ObjectAddress *object,
                                break;
                        }
 
-               case OCLASS_AMPROC:
+               case AccessMethodProcedureRelationId:
                        {
                                Relation        amprocDesc;
                                ScanKeyData skey[1];
@@ -5240,7 +5193,7 @@ getObjectIdentityParts(const ObjectAddress *object,
                                break;
                        }
 
-               case OCLASS_REWRITE:
+               case RewriteRelationId:
                        {
                                Relation        ruleDesc;
                                HeapTuple       tup;
@@ -5273,7 +5226,7 @@ getObjectIdentityParts(const ObjectAddress *object,
                                break;
                        }
 
-               case OCLASS_TRIGGER:
+               case TriggerRelationId:
                        {
                                Relation        trigDesc;
                                HeapTuple       tup;
@@ -5306,7 +5259,7 @@ getObjectIdentityParts(const ObjectAddress *object,
                                break;
                        }
 
-               case OCLASS_SCHEMA:
+               case NamespaceRelationId:
                        {
                                char       *nspname;
 
@@ -5325,7 +5278,7 @@ getObjectIdentityParts(const ObjectAddress *object,
                                break;
                        }
 
-               case OCLASS_STATISTIC_EXT:
+               case StatisticExtRelationId:
                        {
                                HeapTuple       tup;
                                Form_pg_statistic_ext formStatistic;
@@ -5352,7 +5305,7 @@ getObjectIdentityParts(const ObjectAddress *object,
                        }
                        break;
 
-               case OCLASS_TSPARSER:
+               case TSParserRelationId:
                        {
                                HeapTuple       tup;
                                Form_pg_ts_parser formParser;
@@ -5379,7 +5332,7 @@ getObjectIdentityParts(const ObjectAddress *object,
                                break;
                        }
 
-               case OCLASS_TSDICT:
+               case TSDictionaryRelationId:
                        {
                                HeapTuple       tup;
                                Form_pg_ts_dict formDict;
@@ -5406,7 +5359,7 @@ getObjectIdentityParts(const ObjectAddress *object,
                                break;
                        }
 
-               case OCLASS_TSTEMPLATE:
+               case TSTemplateRelationId:
                        {
                                HeapTuple       tup;
                                Form_pg_ts_template formTmpl;
@@ -5433,7 +5386,7 @@ getObjectIdentityParts(const ObjectAddress *object,
                                break;
                        }
 
-               case OCLASS_TSCONFIG:
+               case TSConfigRelationId:
                        {
                                HeapTuple       tup;
                                Form_pg_ts_config formCfg;
@@ -5460,7 +5413,7 @@ getObjectIdentityParts(const ObjectAddress *object,
                                break;
                        }
 
-               case OCLASS_ROLE:
+               case AuthIdRelationId:
                        {
                                char       *username;
 
@@ -5474,7 +5427,7 @@ getObjectIdentityParts(const ObjectAddress *object,
                                break;
                        }
 
-               case OCLASS_ROLE_MEMBERSHIP:
+               case AuthMemRelationId:
                        {
                                Relation        authMemDesc;
                                ScanKeyData skey[1];
@@ -5517,7 +5470,7 @@ getObjectIdentityParts(const ObjectAddress *object,
                                break;
                        }
 
-               case OCLASS_DATABASE:
+               case DatabaseRelationId:
                        {
                                char       *datname;
 
@@ -5536,7 +5489,7 @@ getObjectIdentityParts(const ObjectAddress *object,
                                break;
                        }
 
-               case OCLASS_TBLSPACE:
+               case TableSpaceRelationId:
                        {
                                char       *tblspace;
 
@@ -5555,7 +5508,7 @@ getObjectIdentityParts(const ObjectAddress *object,
                                break;
                        }
 
-               case OCLASS_FDW:
+               case ForeignDataWrapperRelationId:
                        {
                                ForeignDataWrapper *fdw;
 
@@ -5570,7 +5523,7 @@ getObjectIdentityParts(const ObjectAddress *object,
                                break;
                        }
 
-               case OCLASS_FOREIGN_SERVER:
+               case ForeignServerRelationId:
                        {
                                ForeignServer *srv;
 
@@ -5586,7 +5539,7 @@ getObjectIdentityParts(const ObjectAddress *object,
                                break;
                        }
 
-               case OCLASS_USER_MAPPING:
+               case UserMappingRelationId:
                        {
                                HeapTuple       tup;
                                Oid                     useid;
@@ -5626,7 +5579,7 @@ getObjectIdentityParts(const ObjectAddress *object,
                                break;
                        }
 
-               case OCLASS_DEFACL:
+               case DefaultAclRelationId:
                        {
                                Relation        defaclrel;
                                ScanKeyData skey[1];
@@ -5713,7 +5666,7 @@ getObjectIdentityParts(const ObjectAddress *object,
                                break;
                        }
 
-               case OCLASS_EXTENSION:
+               case ExtensionRelationId:
                        {
                                char       *extname;
 
@@ -5731,7 +5684,7 @@ getObjectIdentityParts(const ObjectAddress *object,
                                break;
                        }
 
-               case OCLASS_EVENT_TRIGGER:
+               case EventTriggerRelationId:
                        {
                                HeapTuple       tup;
                                Form_pg_event_trigger trigForm;
@@ -5755,7 +5708,7 @@ getObjectIdentityParts(const ObjectAddress *object,
                                break;
                        }
 
-               case OCLASS_PARAMETER_ACL:
+               case ParameterAclRelationId:
                        {
                                HeapTuple       tup;
                                Datum           nameDatum;
@@ -5780,7 +5733,7 @@ getObjectIdentityParts(const ObjectAddress *object,
                                break;
                        }
 
-               case OCLASS_POLICY:
+               case PolicyRelationId:
                        {
                                Relation        polDesc;
                                HeapTuple       tup;
@@ -5813,7 +5766,7 @@ getObjectIdentityParts(const ObjectAddress *object,
                                break;
                        }
 
-               case OCLASS_PUBLICATION:
+               case PublicationRelationId:
                        {
                                char       *pubname;
 
@@ -5828,7 +5781,7 @@ getObjectIdentityParts(const ObjectAddress *object,
                                break;
                        }
 
-               case OCLASS_PUBLICATION_NAMESPACE:
+               case PublicationNamespaceRelationId:
                        {
                                char       *pubname;
                                char       *nspname;
@@ -5852,7 +5805,7 @@ getObjectIdentityParts(const ObjectAddress *object,
                                break;
                        }
 
-               case OCLASS_PUBLICATION_REL:
+               case PublicationRelRelationId:
                        {
                                HeapTuple       tup;
                                char       *pubname;
@@ -5881,7 +5834,7 @@ getObjectIdentityParts(const ObjectAddress *object,
                                break;
                        }
 
-               case OCLASS_SUBSCRIPTION:
+               case SubscriptionRelationId:
                        {
                                char       *subname;
 
@@ -5896,7 +5849,7 @@ getObjectIdentityParts(const ObjectAddress *object,
                                break;
                        }
 
-               case OCLASS_TRANSFORM:
+               case TransformRelationId:
                        {
                                Relation        transformDesc;
                                HeapTuple       tup;
@@ -5952,8 +5905,8 @@ getObjectIdentityParts(const ObjectAddress *object,
                 * cases above leave it as NIL.
                 */
                if (objname && *objname == NIL)
-                       elog(ERROR, "requested object address for unsupported 
object class %d: text result \"%s\"",
-                                (int) getObjectClass(object), buffer.data);
+                       elog(ERROR, "requested object address for unsupported 
object class %u: text result \"%s\"",
+                                object->classId, buffer.data);
        }
        else
        {
diff --git a/src/backend/commands/alter.c b/src/backend/commands/alter.c
index b2e4260aef..5c131c86b2 100644
--- a/src/backend/commands/alter.c
+++ b/src/backend/commands/alter.c
@@ -33,6 +33,7 @@
 #include "catalog/pg_largeobject_metadata.h"
 #include "catalog/pg_namespace.h"
 #include "catalog/pg_opclass.h"
+#include "catalog/pg_operator.h"
 #include "catalog/pg_opfamily.h"
 #include "catalog/pg_proc.h"
 #include "catalog/pg_statistic_ext.h"
@@ -608,8 +609,7 @@ ExecAlterObjectSchemaStmt(AlterObjectSchemaStmt *stmt,
  * so it only needs to cover object types that can be members of an
  * extension, and it doesn't have to deal with certain special cases
  * such as not wanting to process array types --- those should never
- * be direct members of an extension anyway.  Nonetheless, we insist
- * on listing all OCLASS types in the switch.
+ * be direct members of an extension anyway.
  *
  * Returns the OID of the object's previous namespace, or InvalidOid if
  * object doesn't have a schema.
@@ -619,15 +619,10 @@ AlterObjectNamespace_oid(Oid classId, Oid objid, Oid 
nspOid,
                                                 ObjectAddresses *objsMoved)
 {
        Oid                     oldNspOid = InvalidOid;
-       ObjectAddress dep;
 
-       dep.classId = classId;
-       dep.objectId = objid;
-       dep.objectSubId = 0;
-
-       switch (getObjectClass(&dep))
+       switch (classId)
        {
-               case OCLASS_CLASS:
+               case RelationRelationId:
                        {
                                Relation        rel;
 
@@ -640,21 +635,21 @@ AlterObjectNamespace_oid(Oid classId, Oid objid, Oid 
nspOid,
                                break;
                        }
 
-               case OCLASS_TYPE:
+               case TypeRelationId:
                        oldNspOid = AlterTypeNamespace_oid(objid, nspOid, 
objsMoved);
                        break;
 
-               case OCLASS_PROC:
-               case OCLASS_COLLATION:
-               case OCLASS_CONVERSION:
-               case OCLASS_OPERATOR:
-               case OCLASS_OPCLASS:
-               case OCLASS_OPFAMILY:
-               case OCLASS_STATISTIC_EXT:
-               case OCLASS_TSPARSER:
-               case OCLASS_TSDICT:
-               case OCLASS_TSTEMPLATE:
-               case OCLASS_TSCONFIG:
+               case ProcedureRelationId:
+               case CollationRelationId:
+               case ConversionRelationId:
+               case OperatorRelationId:
+               case OperatorClassRelationId:
+               case OperatorFamilyRelationId:
+               case StatisticExtRelationId:
+               case TSParserRelationId:
+               case TSDictionaryRelationId:
+               case TSTemplateRelationId:
+               case TSConfigRelationId:
                        {
                                Relation        catalog;
 
@@ -667,41 +662,9 @@ AlterObjectNamespace_oid(Oid classId, Oid objid, Oid 
nspOid,
                        }
                        break;
 
-               case OCLASS_CAST:
-               case OCLASS_CONSTRAINT:
-               case OCLASS_DEFAULT:
-               case OCLASS_LANGUAGE:
-               case OCLASS_LARGEOBJECT:
-               case OCLASS_AM:
-               case OCLASS_AMOP:
-               case OCLASS_AMPROC:
-               case OCLASS_REWRITE:
-               case OCLASS_TRIGGER:
-               case OCLASS_SCHEMA:
-               case OCLASS_ROLE:
-               case OCLASS_ROLE_MEMBERSHIP:
-               case OCLASS_DATABASE:
-               case OCLASS_TBLSPACE:
-               case OCLASS_FDW:
-               case OCLASS_FOREIGN_SERVER:
-               case OCLASS_USER_MAPPING:
-               case OCLASS_DEFACL:
-               case OCLASS_EXTENSION:
-               case OCLASS_EVENT_TRIGGER:
-               case OCLASS_PARAMETER_ACL:
-               case OCLASS_POLICY:
-               case OCLASS_PUBLICATION:
-               case OCLASS_PUBLICATION_NAMESPACE:
-               case OCLASS_PUBLICATION_REL:
-               case OCLASS_SUBSCRIPTION:
-               case OCLASS_TRANSFORM:
+               default:
                        /* ignore object types that don't have schema-qualified 
names */
-                       break;
-
-                       /*
-                        * There's intentionally no default: case here; we want 
the
-                        * compiler to warn if a new OCLASS hasn't been handled 
above.
-                        */
+                       Assert(get_object_attnum_namespace(classId) == 
InvalidAttrNumber);
        }
 
        return oldNspOid;
diff --git a/src/backend/commands/tablecmds.c b/src/backend/commands/tablecmds.c
index f798794556..8a5b399b98 100644
--- a/src/backend/commands/tablecmds.c
+++ b/src/backend/commands/tablecmds.c
@@ -43,6 +43,8 @@
 #include "catalog/pg_largeobject.h"
 #include "catalog/pg_namespace.h"
 #include "catalog/pg_opclass.h"
+#include "catalog/pg_policy.h"
+#include "catalog/pg_rewrite.h"
 #include "catalog/pg_statistic_ext.h"
 #include "catalog/pg_tablespace.h"
 #include "catalog/pg_trigger.h"
@@ -13835,9 +13837,9 @@ RememberAllDependentForRebuilding(AlteredTableInfo 
*tab, AlterTableType subtype,
                foundObject.objectId = foundDep->objid;
                foundObject.objectSubId = foundDep->objsubid;
 
-               switch (getObjectClass(&foundObject))
+               switch (foundObject.classId)
                {
-                       case OCLASS_CLASS:
+                       case RelationRelationId:
                                {
                                        char            relKind = 
get_rel_relkind(foundObject.objectId);
 
@@ -13864,12 +13866,12 @@ RememberAllDependentForRebuilding(AlteredTableInfo 
*tab, AlterTableType subtype,
                                        break;
                                }
 
-                       case OCLASS_CONSTRAINT:
+                       case ConstraintRelationId:
                                Assert(foundObject.objectSubId == 0);
                                
RememberConstraintForRebuilding(foundObject.objectId, tab);
                                break;
 
-                       case OCLASS_REWRITE:
+                       case RewriteRelationId:
                                /* XXX someday see if we can cope with revising 
views */
                                if (subtype == AT_AlterColumnType)
                                        ereport(ERROR,
@@ -13880,7 +13882,7 @@ RememberAllDependentForRebuilding(AlteredTableInfo 
*tab, AlterTableType subtype,
                                                                           
colName)));
                                break;
 
-                       case OCLASS_TRIGGER:
+                       case TriggerRelationId:
 
                                /*
                                 * A trigger can depend on a column because the 
column is
@@ -13900,7 +13902,7 @@ RememberAllDependentForRebuilding(AlteredTableInfo 
*tab, AlterTableType subtype,
                                                                           
colName)));
                                break;
 
-                       case OCLASS_POLICY:
+                       case PolicyRelationId:
 
                                /*
                                 * A policy can depend on a column because the 
column is
@@ -13919,7 +13921,7 @@ RememberAllDependentForRebuilding(AlteredTableInfo 
*tab, AlterTableType subtype,
                                                                           
colName)));
                                break;
 
-                       case OCLASS_DEFAULT:
+                       case AttrDefaultRelationId:
                                {
                                        ObjectAddress col = 
GetAttrDefaultColumnAddress(foundObject.objectId);
 
@@ -13954,7 +13956,7 @@ RememberAllDependentForRebuilding(AlteredTableInfo 
*tab, AlterTableType subtype,
                                        break;
                                }
 
-                       case OCLASS_STATISTIC_EXT:
+                       case StatisticExtRelationId:
 
                                /*
                                 * Give the extended-stats machinery a chance 
to fix anything
@@ -13963,53 +13965,15 @@ RememberAllDependentForRebuilding(AlteredTableInfo 
*tab, AlterTableType subtype,
                                
RememberStatisticsForRebuilding(foundObject.objectId, tab);
                                break;
 
-                       case OCLASS_PROC:
-                       case OCLASS_TYPE:
-                       case OCLASS_CAST:
-                       case OCLASS_COLLATION:
-                       case OCLASS_CONVERSION:
-                       case OCLASS_LANGUAGE:
-                       case OCLASS_LARGEOBJECT:
-                       case OCLASS_OPERATOR:
-                       case OCLASS_OPCLASS:
-                       case OCLASS_OPFAMILY:
-                       case OCLASS_AM:
-                       case OCLASS_AMOP:
-                       case OCLASS_AMPROC:
-                       case OCLASS_SCHEMA:
-                       case OCLASS_TSPARSER:
-                       case OCLASS_TSDICT:
-                       case OCLASS_TSTEMPLATE:
-                       case OCLASS_TSCONFIG:
-                       case OCLASS_ROLE:
-                       case OCLASS_ROLE_MEMBERSHIP:
-                       case OCLASS_DATABASE:
-                       case OCLASS_TBLSPACE:
-                       case OCLASS_FDW:
-                       case OCLASS_FOREIGN_SERVER:
-                       case OCLASS_USER_MAPPING:
-                       case OCLASS_DEFACL:
-                       case OCLASS_EXTENSION:
-                       case OCLASS_EVENT_TRIGGER:
-                       case OCLASS_PARAMETER_ACL:
-                       case OCLASS_PUBLICATION:
-                       case OCLASS_PUBLICATION_NAMESPACE:
-                       case OCLASS_PUBLICATION_REL:
-                       case OCLASS_SUBSCRIPTION:
-                       case OCLASS_TRANSFORM:
+                       default:
 
                                /*
-                                * We don't expect any of these sorts of 
objects to depend on
+                                * We don't expect any other sorts of objects 
to depend on
                                 * a column.
                                 */
                                elog(ERROR, "unexpected object depending on 
column: %s",
                                         getObjectDescription(&foundObject, 
false));
                                break;
-
-                               /*
-                                * There's intentionally no default: case here; 
we want the
-                                * compiler to warn if a new OCLASS hasn't been 
handled above.
-                                */
                }
        }
 
diff --git a/src/include/catalog/dependency.h b/src/include/catalog/dependency.h
index 436b081738..ec654010d4 100644
--- a/src/include/catalog/dependency.h
+++ b/src/include/catalog/dependency.h
@@ -81,55 +81,6 @@ typedef enum SharedDependencyType
 /* expansible list of ObjectAddresses (private in dependency.c) */
 typedef struct ObjectAddresses ObjectAddresses;
 
-/*
- * This enum covers all system catalogs whose OIDs can appear in
- * pg_depend.classId or pg_shdepend.classId.
- */
-typedef enum ObjectClass
-{
-       OCLASS_CLASS,                           /* pg_class */
-       OCLASS_PROC,                            /* pg_proc */
-       OCLASS_TYPE,                            /* pg_type */
-       OCLASS_CAST,                            /* pg_cast */
-       OCLASS_COLLATION,                       /* pg_collation */
-       OCLASS_CONSTRAINT,                      /* pg_constraint */
-       OCLASS_CONVERSION,                      /* pg_conversion */
-       OCLASS_DEFAULT,                         /* pg_attrdef */
-       OCLASS_LANGUAGE,                        /* pg_language */
-       OCLASS_LARGEOBJECT,                     /* pg_largeobject */
-       OCLASS_OPERATOR,                        /* pg_operator */
-       OCLASS_OPCLASS,                         /* pg_opclass */
-       OCLASS_OPFAMILY,                        /* pg_opfamily */
-       OCLASS_AM,                                      /* pg_am */
-       OCLASS_AMOP,                            /* pg_amop */
-       OCLASS_AMPROC,                          /* pg_amproc */
-       OCLASS_REWRITE,                         /* pg_rewrite */
-       OCLASS_TRIGGER,                         /* pg_trigger */
-       OCLASS_SCHEMA,                          /* pg_namespace */
-       OCLASS_STATISTIC_EXT,           /* pg_statistic_ext */
-       OCLASS_TSPARSER,                        /* pg_ts_parser */
-       OCLASS_TSDICT,                          /* pg_ts_dict */
-       OCLASS_TSTEMPLATE,                      /* pg_ts_template */
-       OCLASS_TSCONFIG,                        /* pg_ts_config */
-       OCLASS_ROLE,                            /* pg_authid */
-       OCLASS_ROLE_MEMBERSHIP,         /* pg_auth_members */
-       OCLASS_DATABASE,                        /* pg_database */
-       OCLASS_TBLSPACE,                        /* pg_tablespace */
-       OCLASS_FDW,                                     /* 
pg_foreign_data_wrapper */
-       OCLASS_FOREIGN_SERVER,          /* pg_foreign_server */
-       OCLASS_USER_MAPPING,            /* pg_user_mapping */
-       OCLASS_DEFACL,                          /* pg_default_acl */
-       OCLASS_EXTENSION,                       /* pg_extension */
-       OCLASS_EVENT_TRIGGER,           /* pg_event_trigger */
-       OCLASS_PARAMETER_ACL,           /* pg_parameter_acl */
-       OCLASS_POLICY,                          /* pg_policy */
-       OCLASS_PUBLICATION,                     /* pg_publication */
-       OCLASS_PUBLICATION_NAMESPACE,   /* pg_publication_namespace */
-       OCLASS_PUBLICATION_REL,         /* pg_publication_rel */
-       OCLASS_SUBSCRIPTION,            /* pg_subscription */
-       OCLASS_TRANSFORM,                       /* pg_transform */
-} ObjectClass;
-
 /* flag bits for performDeletion/performMultipleDeletions: */
 #define PERFORM_DELETION_INTERNAL                      0x0001  /* internal 
action */
 #define PERFORM_DELETION_CONCURRENTLY          0x0002  /* concurrent drop */
@@ -162,8 +113,6 @@ extern void recordDependencyOnSingleRelExpr(const 
ObjectAddress *depender,
                                                                                
        DependencyType self_behavior,
                                                                                
        bool reverse_self);
 
-extern ObjectClass getObjectClass(const ObjectAddress *object);
-
 extern ObjectAddresses *new_object_addresses(void);
 
 extern void add_exact_object_address(const ObjectAddress *object,
-- 
2.43.2

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