chore: import upstream snapshot with attribution

server/ast/create_extension.go

@@ -0,0 +1,51 @@
+// Copyright 2024 Dolthub, Inc.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package ast
+
+import (
+	vitess "github.com/dolthub/vitess/go/vt/sqlparser"
+
+	pgnodes "github.com/dolthub/doltgresql/server/node"
+
+	"github.com/dolthub/doltgresql/postgres/parser/sem/tree"
+)
+
+// nodeCreateExtension handles *tree.CreateExtension nodes.
+func nodeCreateExtension(ctx *Context, node *tree.CreateExtension) (vitess.Statement, error) {
+	if len(node.Schema) > 0 {
+		if node.Schema == "pg_catalog" && node.Name == "plpgsql" {
+			return nil, nil
+		} else if node.Schema != "public" {
+			return NotYetSupportedError("non public SCHEMA is not yet supported")
+		}
+		// TODO filter out extensions we support
+	}
+	if len(node.Version) > 0 {
+		return NotYetSupportedError("VERSION is not yet supported")
+	}
+	if node.Cascade {
+		return NotYetSupportedError("CASCADE is not yet supported")
+	}
+	return vitess.InjectedStatement{
+		Statement: pgnodes.NewCreateExtension(
+			string(node.Name),
+			node.IfNotExists,
+			node.Schema,
+			node.Version,
+			node.Cascade,
+		),
+		Children: nil,
+	}, nil
+}