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

1 files changed, 14 insertions, 0 deletions

diff --git a/src/backend/nodes/copyfuncs.c b/src/backend/nodes/copyfuncs.c
index 9b2c874d6d0..851186146dd 100644
--- a/src/backend/nodes/copyfuncs.c
+++ b/src/backend/nodes/copyfuncs.c
@@ -3239,6 +3239,17 @@ _copyAlterTableSpaceOptionsStmt(AlterTableSpaceOptionsStmt *from)
 	return newnode;
 }
 
+static CreateExtensionStmt *
+_copyCreateExtensionStmt(CreateExtensionStmt *from)
+{
+	CreateExtensionStmt *newnode = makeNode(CreateExtensionStmt);
+
+	COPY_STRING_FIELD(extname);
+	COPY_NODE_FIELD(options);
+
+	return newnode;
+}
+
 static CreateFdwStmt *
 _copyCreateFdwStmt(CreateFdwStmt *from)
 {
@@ -4238,6 +4249,9 @@ copyObject(void *from)
 		case T_AlterTableSpaceOptionsStmt:
 			retval = _copyAlterTableSpaceOptionsStmt(from);
 			break;
+		case T_CreateExtensionStmt:
+			retval = _copyCreateExtensionStmt(from);
+			break;
 		case T_CreateFdwStmt:
 			retval = _copyCreateFdwStmt(from);
 			break;