diff --git a/src/backend/catalog/dependency.c b/src/backend/catalog/dependency.c
index eca064f0cde..1b92f5c38a1 100644
--- a/src/backend/catalog/dependency.c
+++ b/src/backend/catalog/dependency.c
@@ -20,6 +20,7 @@
 #include "catalog/heap.h"
 #include "catalog/index.h"
 #include "catalog/namespace.h"
+#include "catalog/objectaccess.h"
 #include "catalog/pg_amop.h"
 #include "catalog/pg_amproc.h"
 #include "catalog/pg_attrdef.h"
@@ -991,6 +992,15 @@ deleteOneObject(const ObjectAddress *object, Relation depRel, int flags)
 	SysScanDesc scan;
 	HeapTuple	tup;
 
+	/* DROP hook of the objects being removed */
+	if (object_access_hook)
+	{
+		ObjectAccessDrop	drop_arg;
+		drop_arg.dropflags = flags;
+		InvokeObjectAccessHook(OAT_DROP, object->classId, object->objectId,
+							   object->objectSubId, &drop_arg);
+	}
+
 	/*
 	 * First remove any pg_depend records that link from this object to
 	 * others.	(Any records linking to this object should be gone already.)
diff --git a/src/backend/catalog/heap.c b/src/backend/catalog/heap.c
index d1d458d7fa4..8bd5a9296e1 100644
--- a/src/backend/catalog/heap.c
+++ b/src/backend/catalog/heap.c
@@ -1286,7 +1286,8 @@ heap_create_with_catalog(const char *relname,
 	}
 
 	/* Post creation hook for new relation */
-	InvokeObjectAccessHook(OAT_POST_CREATE, RelationRelationId, relid, 0);
+	InvokeObjectAccessHook(OAT_POST_CREATE,
+						   RelationRelationId, relid, 0, NULL);
 
 	/*
 	 * Store any supplied constraints and defaults.
diff --git a/src/backend/catalog/pg_collation.c b/src/backend/catalog/pg_collation.c
index 511d70c044d..18c7acf0e81 100644
--- a/src/backend/catalog/pg_collation.c
+++ b/src/backend/catalog/pg_collation.c
@@ -136,7 +136,7 @@ CollationCreate(const char *collname, Oid collnamespace,
 
 	/* Post creation hook for new collation */
 	InvokeObjectAccessHook(OAT_POST_CREATE,
-						   CollationRelationId, oid, 0);
+						   CollationRelationId, oid, 0, NULL);
 
 	heap_freetuple(tup);
 	heap_close(rel, RowExclusiveLock);
diff --git a/src/backend/catalog/pg_constraint.c b/src/backend/catalog/pg_constraint.c
index 0bad4d99cb4..342cf75270a 100644
--- a/src/backend/catalog/pg_constraint.c
+++ b/src/backend/catalog/pg_constraint.c
@@ -366,7 +366,8 @@ CreateConstraintEntry(const char *constraintName,
 	}
 
 	/* Post creation hook for new constraint */
-	InvokeObjectAccessHook(OAT_POST_CREATE, ConstraintRelationId, conOid, 0);
+	InvokeObjectAccessHook(OAT_POST_CREATE,
+						   ConstraintRelationId, conOid, 0, NULL);
 
 	return conOid;
 }
diff --git a/src/backend/catalog/pg_conversion.c b/src/backend/catalog/pg_conversion.c
index 8194cd6c267..f86c84fc4bb 100644
--- a/src/backend/catalog/pg_conversion.c
+++ b/src/backend/catalog/pg_conversion.c
@@ -134,8 +134,8 @@ ConversionCreate(const char *conname, Oid connamespace,
 	recordDependencyOnCurrentExtension(&myself, false);
 
 	/* Post creation hook for new conversion */
-	InvokeObjectAccessHook(OAT_POST_CREATE,
-						   ConversionRelationId, HeapTupleGetOid(tup), 0);
+	InvokeObjectAccessHook(OAT_POST_CREATE, ConversionRelationId,
+						   HeapTupleGetOid(tup), 0, NULL);
 
 	heap_freetuple(tup);
 	heap_close(rel, RowExclusiveLock);
diff --git a/src/backend/catalog/pg_namespace.c b/src/backend/catalog/pg_namespace.c
index be812a246c0..de856760f08 100644
--- a/src/backend/catalog/pg_namespace.c
+++ b/src/backend/catalog/pg_namespace.c
@@ -95,7 +95,8 @@ NamespaceCreate(const char *nspName, Oid ownerId, bool isTemp)
 		recordDependencyOnCurrentExtension(&myself, false);
 
 	/* Post creation hook for new schema */
-	InvokeObjectAccessHook(OAT_POST_CREATE, NamespaceRelationId, nspoid, 0);
+	InvokeObjectAccessHook(OAT_POST_CREATE,
+						   NamespaceRelationId, nspoid, 0, NULL);
 
 	return nspoid;
 }
diff --git a/src/backend/catalog/pg_operator.c b/src/backend/catalog/pg_operator.c
index 3b727222413..4fd55ae5706 100644
--- a/src/backend/catalog/pg_operator.c
+++ b/src/backend/catalog/pg_operator.c
@@ -275,7 +275,7 @@ OperatorShellMake(const char *operatorName,
 
 	/* Post creation hook for new shell operator */
 	InvokeObjectAccessHook(OAT_POST_CREATE,
-						   OperatorRelationId, operatorObjectId, 0);
+						   OperatorRelationId, operatorObjectId, 0, NULL);
 
 	/*
 	 * Make sure the tuple is visible for subsequent lookups/updates.
@@ -544,7 +544,7 @@ OperatorCreate(const char *operatorName,
 
 	/* Post creation hook for new operator */
 	InvokeObjectAccessHook(OAT_POST_CREATE,
-						   OperatorRelationId, operatorObjectId, 0);
+						   OperatorRelationId, operatorObjectId, 0, NULL);
 
 	heap_close(pg_operator_desc, RowExclusiveLock);
 
diff --git a/src/backend/catalog/pg_proc.c b/src/backend/catalog/pg_proc.c
index 91ead4cb9d2..1fffe1c6ac3 100644
--- a/src/backend/catalog/pg_proc.c
+++ b/src/backend/catalog/pg_proc.c
@@ -655,7 +655,8 @@ ProcedureCreate(const char *procedureName,
 	heap_freetuple(tup);
 
 	/* Post creation hook for new function */
-	InvokeObjectAccessHook(OAT_POST_CREATE, ProcedureRelationId, retval, 0);
+	InvokeObjectAccessHook(OAT_POST_CREATE,
+						   ProcedureRelationId, retval, 0, NULL);
 
 	heap_close(rel, RowExclusiveLock);
 
diff --git a/src/backend/catalog/pg_type.c b/src/backend/catalog/pg_type.c
index 2c2e3b3e7cf..5b2ad6bfe0d 100644
--- a/src/backend/catalog/pg_type.c
+++ b/src/backend/catalog/pg_type.c
@@ -162,7 +162,8 @@ TypeShellMake(const char *typeName, Oid typeNamespace, Oid ownerId)
 								 false);
 
 	/* Post creation hook for new shell type */
-	InvokeObjectAccessHook(OAT_POST_CREATE, TypeRelationId, typoid, 0);
+	InvokeObjectAccessHook(OAT_POST_CREATE,
+						   TypeRelationId, typoid, 0, NULL);
 
 	/*
 	 * clean up and return the type-oid
@@ -474,7 +475,8 @@ TypeCreate(Oid newTypeOid,
 								 rebuildDeps);
 
 	/* Post creation hook for new type */
-	InvokeObjectAccessHook(OAT_POST_CREATE, TypeRelationId, typeObjectId, 0);
+	InvokeObjectAccessHook(OAT_POST_CREATE,
+						   TypeRelationId, typeObjectId, 0, NULL);
 
 	/*
 	 * finish up
diff --git a/src/backend/commands/dbcommands.c b/src/backend/commands/dbcommands.c
index 42a8b31b2a8..91d74815287 100644
--- a/src/backend/commands/dbcommands.c
+++ b/src/backend/commands/dbcommands.c
@@ -515,7 +515,8 @@ createdb(const CreatedbStmt *stmt)
 	copyTemplateDependencies(src_dboid, dboid);
 
 	/* Post creation hook for new database */
-	InvokeObjectAccessHook(OAT_POST_CREATE, DatabaseRelationId, dboid, 0);
+	InvokeObjectAccessHook(OAT_POST_CREATE,
+						   DatabaseRelationId, dboid, 0, NULL);
 
 	/*
 	 * Force a checkpoint before starting the copy. This will force dirty
@@ -777,6 +778,15 @@ dropdb(const char *dbname, bool missing_ok)
 		aclcheck_error(ACLCHECK_NOT_OWNER, ACL_KIND_DATABASE,
 					   dbname);
 
+	/* DROP hook for the database being removed */
+	if (object_access_hook)
+	{
+		ObjectAccessDrop    drop_arg;
+		memset(&drop_arg, 0, sizeof(ObjectAccessDrop));
+		InvokeObjectAccessHook(OAT_DROP,
+							   DatabaseRelationId, db_id, 0, &drop_arg);
+	}
+
 	/*
 	 * Disallow dropping a DB that is marked istemplate.  This is just to
 	 * prevent people from accidentally dropping template0 or template1; they
diff --git a/src/backend/commands/extension.c b/src/backend/commands/extension.c
index a9963ac93b9..732791cc413 100644
--- a/src/backend/commands/extension.c
+++ b/src/backend/commands/extension.c
@@ -1558,7 +1558,7 @@ InsertExtensionTuple(const char *extName, Oid extOwner,
 	}
 	/* Post creation hook for new extension */
 	InvokeObjectAccessHook(OAT_POST_CREATE,
-						   ExtensionRelationId, extensionOid, 0);
+						   ExtensionRelationId, extensionOid, 0, NULL);
 
 	return extensionOid;
 }
diff --git a/src/backend/commands/foreigncmds.c b/src/backend/commands/foreigncmds.c
index 5d18bdcf0a9..30135e6de8b 100644
--- a/src/backend/commands/foreigncmds.c
+++ b/src/backend/commands/foreigncmds.c
@@ -666,7 +666,7 @@ CreateForeignDataWrapper(CreateFdwStmt *stmt)
 
 	/* Post creation hook for new foreign data wrapper */
 	InvokeObjectAccessHook(OAT_POST_CREATE,
-						   ForeignDataWrapperRelationId, fdwId, 0);
+						   ForeignDataWrapperRelationId, fdwId, 0, NULL);
 
 	heap_close(rel, RowExclusiveLock);
 }
@@ -962,7 +962,8 @@ CreateForeignServer(CreateForeignServerStmt *stmt)
 	recordDependencyOnCurrentExtension(&myself, false);
 
 	/* Post creation hook for new foreign server */
-	InvokeObjectAccessHook(OAT_POST_CREATE, ForeignServerRelationId, srvId, 0);
+	InvokeObjectAccessHook(OAT_POST_CREATE,
+						   ForeignServerRelationId, srvId, 0, NULL);
 
 	heap_close(rel, RowExclusiveLock);
 }
@@ -1202,7 +1203,8 @@ CreateUserMapping(CreateUserMappingStmt *stmt)
 	recordDependencyOnCurrentExtension(&myself, false);
 
 	/* Post creation hook for new user mapping */
-	InvokeObjectAccessHook(OAT_POST_CREATE, UserMappingRelationId, umId, 0);
+	InvokeObjectAccessHook(OAT_POST_CREATE,
+						   UserMappingRelationId, umId, 0, NULL);
 
 	heap_close(rel, RowExclusiveLock);
 }
diff --git a/src/backend/commands/functioncmds.c b/src/backend/commands/functioncmds.c
index ce866a20a99..4125b97e89e 100644
--- a/src/backend/commands/functioncmds.c
+++ b/src/backend/commands/functioncmds.c
@@ -1759,7 +1759,8 @@ CreateCast(CreateCastStmt *stmt)
 	recordDependencyOnCurrentExtension(&myself, false);
 
 	/* Post creation hook for new cast */
-	InvokeObjectAccessHook(OAT_POST_CREATE, CastRelationId, castid, 0);
+	InvokeObjectAccessHook(OAT_POST_CREATE,
+						   CastRelationId, castid, 0, NULL);
 
 	heap_freetuple(tuple);
 
diff --git a/src/backend/commands/opclasscmds.c b/src/backend/commands/opclasscmds.c
index 5dc131a50e2..87c889604e2 100644
--- a/src/backend/commands/opclasscmds.c
+++ b/src/backend/commands/opclasscmds.c
@@ -314,7 +314,7 @@ CreateOpFamily(char *amname, char *opfname, Oid namespaceoid, Oid amoid)
 
 	/* Post creation hook for new operator family */
 	InvokeObjectAccessHook(OAT_POST_CREATE,
-						   OperatorFamilyRelationId, opfamilyoid, 0);
+						   OperatorFamilyRelationId, opfamilyoid, 0, NULL);
 
 	heap_close(rel, RowExclusiveLock);
 
@@ -717,7 +717,7 @@ DefineOpClass(CreateOpClassStmt *stmt)
 
 	/* Post creation hook for new operator class */
 	InvokeObjectAccessHook(OAT_POST_CREATE,
-						   OperatorClassRelationId, opclassoid, 0);
+						   OperatorClassRelationId, opclassoid, 0, NULL);
 
 	heap_close(rel, RowExclusiveLock);
 }
diff --git a/src/backend/commands/proclang.c b/src/backend/commands/proclang.c
index 8d6a0416d5f..41775fd8674 100644
--- a/src/backend/commands/proclang.c
+++ b/src/backend/commands/proclang.c
@@ -428,7 +428,7 @@ create_proc_lang(const char *languageName, bool replace,
 
 	/* Post creation hook for new procedural language */
 	InvokeObjectAccessHook(OAT_POST_CREATE,
-						   LanguageRelationId, myself.objectId, 0);
+						   LanguageRelationId, myself.objectId, 0, NULL);
 
 	heap_close(rel, RowExclusiveLock);
 }
diff --git a/src/backend/commands/tablecmds.c b/src/backend/commands/tablecmds.c
index cd4490a1c24..25ca356b867 100644
--- a/src/backend/commands/tablecmds.c
+++ b/src/backend/commands/tablecmds.c
@@ -4382,7 +4382,7 @@ ATExecAddColumn(List **wqueue, AlteredTableInfo *tab, Relation rel,
 
 	/* Post creation hook for new attribute */
 	InvokeObjectAccessHook(OAT_POST_CREATE,
-						   RelationRelationId, myrelid, newattnum);
+						   RelationRelationId, myrelid, newattnum, NULL);
 
 	heap_close(pgclass, RowExclusiveLock);
 
diff --git a/src/backend/commands/tablespace.c b/src/backend/commands/tablespace.c
index 5e10f8c9a33..d66ea3b6c12 100644
--- a/src/backend/commands/tablespace.c
+++ b/src/backend/commands/tablespace.c
@@ -330,7 +330,7 @@ CreateTableSpace(CreateTableSpaceStmt *stmt)
 
 	/* Post creation hook for new tablespace */
 	InvokeObjectAccessHook(OAT_POST_CREATE,
-						   TableSpaceRelationId, tablespaceoid, 0);
+						   TableSpaceRelationId, tablespaceoid, 0, NULL);
 
 	create_tablespace_directories(location, tablespaceoid);
 
@@ -434,6 +434,15 @@ DropTableSpace(DropTableSpaceStmt *stmt)
 		aclcheck_error(ACLCHECK_NO_PRIV, ACL_KIND_TABLESPACE,
 					   tablespacename);
 
+	/* DROP hook for the tablespace being removed */
+	if (object_access_hook)
+	{
+		ObjectAccessDrop    drop_arg;
+		memset(&drop_arg, 0, sizeof(ObjectAccessDrop));
+		InvokeObjectAccessHook(OAT_DROP, TableSpaceRelationId,
+							   tablespaceoid, 0, &drop_arg);
+	}
+
 	/*
 	 * Remove the pg_tablespace tuple (this will roll back if we fail below)
 	 */
diff --git a/src/backend/commands/trigger.c b/src/backend/commands/trigger.c
index caae2dafab1..a98d1b884ee 100644
--- a/src/backend/commands/trigger.c
+++ b/src/backend/commands/trigger.c
@@ -756,7 +756,7 @@ CreateTrigger(CreateTrigStmt *stmt, const char *queryString,
 
 	/* Post creation hook for new trigger */
 	InvokeObjectAccessHook(OAT_POST_CREATE,
-						   TriggerRelationId, trigoid, 0);
+						   TriggerRelationId, trigoid, 0, NULL);
 
 	/* Keep lock on target rel until end of xact */
 	heap_close(rel, NoLock);
diff --git a/src/backend/commands/tsearchcmds.c b/src/backend/commands/tsearchcmds.c
index fe500a6d7f9..86cb8704da8 100644
--- a/src/backend/commands/tsearchcmds.c
+++ b/src/backend/commands/tsearchcmds.c
@@ -271,7 +271,8 @@ DefineTSParser(List *names, List *parameters)
 	makeParserDependencies(tup);
 
 	/* Post creation hook for new text search parser */
-	InvokeObjectAccessHook(OAT_POST_CREATE, TSParserRelationId, prsOid, 0);
+	InvokeObjectAccessHook(OAT_POST_CREATE,
+						   TSParserRelationId, prsOid, 0, NULL);
 
 	heap_freetuple(tup);
 
@@ -565,7 +566,7 @@ DefineTSDictionary(List *names, List *parameters)
 
 	/* Post creation hook for new text search dictionary */
 	InvokeObjectAccessHook(OAT_POST_CREATE,
-						   TSDictionaryRelationId, dictOid, 0);
+						   TSDictionaryRelationId, dictOid, 0, NULL);
 
 	heap_freetuple(tup);
 
@@ -1036,7 +1037,8 @@ DefineTSTemplate(List *names, List *parameters)
 	makeTSTemplateDependencies(tup);
 
 	/* Post creation hook for new text search template */
-	InvokeObjectAccessHook(OAT_POST_CREATE, TSTemplateRelationId, dictOid, 0);
+	InvokeObjectAccessHook(OAT_POST_CREATE,
+						   TSTemplateRelationId, dictOid, 0, NULL);
 
 	heap_freetuple(tup);
 
@@ -1419,7 +1421,8 @@ DefineTSConfiguration(List *names, List *parameters)
 	makeConfigurationDependencies(tup, false, mapRel);
 
 	/* Post creation hook for new text search configuration */
-	InvokeObjectAccessHook(OAT_POST_CREATE, TSConfigRelationId, cfgOid, 0);
+	InvokeObjectAccessHook(OAT_POST_CREATE,
+						   TSConfigRelationId, cfgOid, 0, NULL);
 
 	heap_freetuple(tup);
 
diff --git a/src/backend/commands/user.c b/src/backend/commands/user.c
index 9a88c907894..2edbabe7549 100644
--- a/src/backend/commands/user.c
+++ b/src/backend/commands/user.c
@@ -425,7 +425,8 @@ CreateRole(CreateRoleStmt *stmt)
 				GetUserId(), false);
 
 	/* Post creation hook for new role */
-	InvokeObjectAccessHook(OAT_POST_CREATE, AuthIdRelationId, roleid, 0);
+	InvokeObjectAccessHook(OAT_POST_CREATE,
+						   AuthIdRelationId, roleid, 0, NULL);
 
 	/*
 	 * Close pg_authid, but keep lock till commit.
@@ -932,6 +933,15 @@ DropRole(DropRoleStmt *stmt)
 					(errcode(ERRCODE_INSUFFICIENT_PRIVILEGE),
 					 errmsg("must be superuser to drop superusers")));
 
+		/* DROP hook for the role being removed */
+		if (object_access_hook)
+		{
+			ObjectAccessDrop	drop_arg;
+			memset(&drop_arg, 0, sizeof(ObjectAccessDrop));
+			InvokeObjectAccessHook(OAT_DROP,
+								   AuthIdRelationId, roleid, 0, &drop_arg);
+		}
+
 		/*
 		 * Lock the role, so nobody can add dependencies to her while we drop
 		 * her.  We keep the lock until the end of transaction.
diff --git a/src/backend/rewrite/rewriteDefine.c b/src/backend/rewrite/rewriteDefine.c
index 8c87ac599f9..645182dbfa4 100644
--- a/src/backend/rewrite/rewriteDefine.c
+++ b/src/backend/rewrite/rewriteDefine.c
@@ -178,7 +178,7 @@ InsertRule(char *rulname,
 
 	/* Post creation hook for new rule */
 	InvokeObjectAccessHook(OAT_POST_CREATE,
-						   RewriteRelationId, rewriteObjectId, 0);
+						   RewriteRelationId, rewriteObjectId, 0, NULL);
 
 	heap_close(pg_rewrite_desc, RowExclusiveLock);
 
diff --git a/src/backend/storage/large_object/inv_api.c b/src/backend/storage/large_object/inv_api.c
index a14ce442c1c..3adfb159b8b 100644
--- a/src/backend/storage/large_object/inv_api.c
+++ b/src/backend/storage/large_object/inv_api.c
@@ -217,7 +217,7 @@ inv_create(Oid lobjId)
 
 	/* Post creation hook for new large object */
 	InvokeObjectAccessHook(OAT_POST_CREATE,
-						   LargeObjectRelationId, lobjId_new, 0);
+						   LargeObjectRelationId, lobjId_new, 0, NULL);
 
 	/*
 	 * Advance command counter to make new tuple visible to later operations.
diff --git a/src/include/catalog/objectaccess.h b/src/include/catalog/objectaccess.h
index 5c7a40a31cb..9763280177b 100644
--- a/src/include/catalog/objectaccess.h
+++ b/src/include/catalog/objectaccess.h
@@ -19,28 +19,45 @@
  * Typically, this is done after inserting the primary catalog records and
  * associated dependencies.
  *
+ * OAT_DROP should be invoked just before deletion of objects; typically
+ * deleteOneObject(). Its arguments are packed within ObjectAccessDrop.
+ *
  * Other types may be added in the future.
  */
 typedef enum ObjectAccessType
 {
 	OAT_POST_CREATE,
+	OAT_DROP,
 } ObjectAccessType;
 
+/*
+ * Arguments of OAT_DROP event
+ */
+typedef struct
+{
+	/*
+	 * Flags to inform extensions the context of this deletion.
+	 * Also see PERFORM_DELETION_* in dependency.h
+	 */
+	int		dropflags;
+} ObjectAccessDrop;
+
 /*
  * Hook, and a macro to invoke it.
  */
-
 typedef void (*object_access_hook_type) (ObjectAccessType access,
 													 Oid classId,
 													 Oid objectId,
-													 int subId);
+													 int subId,
+													 void *arg);
 
 extern PGDLLIMPORT object_access_hook_type object_access_hook;
 
-#define InvokeObjectAccessHook(access,classId,objectId,subId)			\
-	do {																\
-		if (object_access_hook)											\
-			(*object_access_hook)((access),(classId),(objectId),(subId)); \
+#define InvokeObjectAccessHook(access,classId,objectId,subId,arg)	\
+	do {															\
+		if (object_access_hook)										\
+			(*object_access_hook)((access),(classId),				\
+								  (objectId),(subId),(arg));		\
 	} while(0)
 
 #endif   /* OBJECTACCESS_H */