Core support for "extensions", which are packages of SQL objects.

This patch adds the server infrastructure to support extensions.
There is still one significant loose end, namely how to make it play nice
with pg_upgrade, so I am not yet committing the changes that would make
all the contrib modules depend on this feature.

In passing, fix a disturbingly large amount of breakage in
AlterObjectNamespace() and callers.

Dimitri Fontaine, reviewed by Anssi Kääriäinen,
Itagaki Takahiro, Tom Lane, and numerous others

5 files changed, 56 insertions, 6 deletions

diff --git a/src/include/commands/alter.h b/src/include/commands/alter.h
index 74d5132636c..21731685f5c 100644
--- a/src/include/commands/alter.h
+++ b/src/include/commands/alter.h
@@ -20,11 +20,11 @@
 
 extern void ExecRenameStmt(RenameStmt *stmt);
 extern void ExecAlterObjectSchemaStmt(AlterObjectSchemaStmt *stmt);
-extern void AlterObjectNamespace(Relation rel, int cacheId,
-								 Oid classId, Oid objid, Oid nspId,
-								 int Anum_name, int Anum_namespace, int Anum_owner,
-								 AclObjectKind acl_kind,
-								 bool superuser_only);
+extern Oid	AlterObjectNamespace_oid(Oid classId, Oid objid, Oid nspOid);
+extern Oid	AlterObjectNamespace(Relation rel, int oidCacheId, int nameCacheId,
+					 Oid objid, Oid nspOid,
+					 int Anum_name, int Anum_namespace, int Anum_owner,
+					 AclObjectKind acl_kind);
 extern void ExecAlterOwnerStmt(AlterOwnerStmt *stmt);
 
 #endif   /* ALTER_H */
diff --git a/src/include/commands/conversioncmds.h b/src/include/commands/conversioncmds.h
index 6156c4a94e6..f77023ffe32 100644
--- a/src/include/commands/conversioncmds.h
+++ b/src/include/commands/conversioncmds.h
@@ -23,5 +23,6 @@ extern void RenameConversion(List *name, const char *newname);
 extern void AlterConversionOwner(List *name, Oid newOwnerId);
 extern void AlterConversionOwner_oid(Oid conversionOid, Oid newOwnerId);
 extern void AlterConversionNamespace(List *name, const char *newschema);
+extern Oid	AlterConversionNamespace_oid(Oid convOid, Oid newNspOid);
 
 #endif   /* CONVERSIONCMDS_H */
diff --git a/src/include/commands/defrem.h b/src/include/commands/defrem.h
index 01f271bff43..157ee394614 100644
--- a/src/include/commands/defrem.h
+++ b/src/include/commands/defrem.h
@@ -66,6 +66,7 @@ extern void DropCast(DropCastStmt *stmt);
 extern void DropCastById(Oid castOid);
 extern void AlterFunctionNamespace(List *name, List *argtypes, bool isagg,
 					   const char *newschema);
+extern Oid	AlterFunctionNamespace_oid(Oid procOid, Oid nspOid);
 extern void ExecuteDoStmt(DoStmt *stmt);
 extern Oid get_cast_oid(Oid sourcetypeid, Oid targettypeid, bool missing_ok);
 
@@ -77,6 +78,7 @@ extern void AlterOperatorOwner(List *name, TypeName *typeName1,
 				   TypeName *typename2, Oid newOwnerId);
 extern void AlterOperatorOwner_oid(Oid operOid, Oid newOwnerId);
 extern void AlterOperatorNamespace(List *names, List *argtypes, const char *newschema);
+extern Oid	AlterOperatorNamespace_oid(Oid operOid, Oid newNspOid);
 
 /* commands/aggregatecmds.c */
 extern void DefineAggregate(List *name, List *args, bool oldstyle,
@@ -100,9 +102,11 @@ extern void RenameOpFamily(List *name, const char *access_method, const char *ne
 extern void AlterOpClassOwner(List *name, const char *access_method, Oid newOwnerId);
 extern void AlterOpClassOwner_oid(Oid opclassOid, Oid newOwnerId);
 extern void AlterOpClassNamespace(List *name, char *access_method, const char *newschema);
+extern Oid	AlterOpClassNamespace_oid(Oid opclassOid, Oid newNspOid);
 extern void AlterOpFamilyOwner(List *name, const char *access_method, Oid newOwnerId);
 extern void AlterOpFamilyOwner_oid(Oid opfamilyOid, Oid newOwnerId);
 extern void AlterOpFamilyNamespace(List *name, char *access_method, const char *newschema);
+extern Oid	AlterOpFamilyNamespace_oid(Oid opfamilyOid, Oid newNspOid);
 extern Oid get_am_oid(const char *amname, bool missing_ok);
 extern Oid get_opclass_oid(Oid amID, List *opclassname, bool missing_ok);
 extern Oid get_opfamily_oid(Oid amID, List *opfamilyname, bool missing_ok);
@@ -111,6 +115,7 @@ extern Oid get_opfamily_oid(Oid amID, List *opfamilyname, bool missing_ok);
 extern void DefineTSParser(List *names, List *parameters);
 extern void RenameTSParser(List *oldname, const char *newname);
 extern void AlterTSParserNamespace(List *name, const char *newschema);
+extern Oid	AlterTSParserNamespace_oid(Oid prsId, Oid newNspOid);
 extern void RemoveTSParsers(DropStmt *drop);
 extern void RemoveTSParserById(Oid prsId);
 
@@ -121,10 +126,12 @@ extern void RemoveTSDictionaryById(Oid dictId);
 extern void AlterTSDictionary(AlterTSDictionaryStmt *stmt);
 extern void AlterTSDictionaryOwner(List *name, Oid newOwnerId);
 extern void AlterTSDictionaryNamespace(List *name, const char *newschema);
+extern Oid	AlterTSDictionaryNamespace_oid(Oid dictId, Oid newNspOid);
 
 extern void DefineTSTemplate(List *names, List *parameters);
 extern void RenameTSTemplate(List *oldname, const char *newname);
 extern void AlterTSTemplateNamespace(List *name, const char *newschema);
+extern Oid	AlterTSTemplateNamespace_oid(Oid tmplId, Oid newNspOid);
 extern void RemoveTSTemplates(DropStmt *stmt);
 extern void RemoveTSTemplateById(Oid tmplId);
 
@@ -135,6 +142,7 @@ extern void RemoveTSConfigurationById(Oid cfgId);
 extern void AlterTSConfiguration(AlterTSConfigurationStmt *stmt);
 extern void AlterTSConfigurationOwner(List *name, Oid newOwnerId);
 extern void AlterTSConfigurationNamespace(List *name, const char *newschema);
+extern Oid	AlterTSConfigurationNamespace_oid(Oid cfgId, Oid newNspOid);
 
 extern text *serialize_deflist(List *deflist);
 extern List *deserialize_deflist(Datum txt);
diff --git a/src/include/commands/extension.h b/src/include/commands/extension.h
new file mode 100644
index 00000000000..10d08935a00
--- /dev/null
+++ b/src/include/commands/extension.h
@@ -0,0 +1,40 @@
+/*-------------------------------------------------------------------------
+ *
+ * extension.h
+ *		Extension management commands (create/drop extension).
+ *
+ *
+ * Portions Copyright (c) 1996-2011, PostgreSQL Global Development Group
+ * Portions Copyright (c) 1994, Regents of the University of California
+ *
+ * src/include/commands/extension.h
+ *
+ *-------------------------------------------------------------------------
+ */
+#ifndef EXTENSION_H
+#define EXTENSION_H
+
+#include "nodes/parsenodes.h"
+
+
+/*
+ * creating_extension is only true while running a CREATE EXTENSION command.
+ * It instructs recordDependencyOnCurrentExtension() to register a dependency
+ * on the current pg_extension object for each SQL object created by its
+ * installation script.
+ */
+extern bool creating_extension;
+extern Oid CurrentExtensionObject;
+
+
+extern void CreateExtension(CreateExtensionStmt *stmt);
+
+extern void RemoveExtensions(DropStmt *stmt);
+extern void RemoveExtensionById(Oid extId);
+
+extern Oid	get_extension_oid(const char *extname, bool missing_ok);
+extern char *get_extension_name(Oid ext_oid);
+
+extern void AlterExtensionNamespace(List *names, const char *newschema);
+
+#endif   /* EXTENSION_H */
diff --git a/src/include/commands/typecmds.h b/src/include/commands/typecmds.h
index b13363aaf7e..1b20296934f 100644
--- a/src/include/commands/typecmds.h
+++ b/src/include/commands/typecmds.h
@@ -41,7 +41,8 @@ extern void AlterTypeOwner(List *names, Oid newOwnerId);
 extern void AlterTypeOwnerInternal(Oid typeOid, Oid newOwnerId,
 					   bool hasDependEntry);
 extern void AlterTypeNamespace(List *names, const char *newschema);
-extern void AlterTypeNamespaceInternal(Oid typeOid, Oid nspOid,
+extern Oid	AlterTypeNamespace_oid(Oid typeOid, Oid nspOid);
+extern Oid	AlterTypeNamespaceInternal(Oid typeOid, Oid nspOid,
 						   bool isImplicitArray,
 						   bool errorOnTableType);