chore: import upstream snapshot with attribution

server/tables/pgcatalog/pg_enum.go

@@ -0,0 +1,82 @@
+// 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 pgcatalog
+
+import (
+	"io"
+
+	"github.com/dolthub/go-mysql-server/sql"
+
+	"github.com/dolthub/doltgresql/server/tables"
+	pgtypes "github.com/dolthub/doltgresql/server/types"
+)
+
+// PgEnumName is a constant to the pg_enum name.
+const PgEnumName = "pg_enum"
+
+// InitPgEnum handles registration of the pg_enum handler.
+func InitPgEnum() {
+	tables.AddHandler(PgCatalogName, PgEnumName, PgEnumHandler{})
+}
+
+// PgEnumHandler is the handler for the pg_enum table.
+type PgEnumHandler struct{}
+
+var _ tables.Handler = PgEnumHandler{}
+
+// Name implements the interface tables.Handler.
+func (p PgEnumHandler) Name() string {
+	return PgEnumName
+}
+
+// RowIter implements the interface tables.Handler.
+func (p PgEnumHandler) RowIter(ctx *sql.Context, partition sql.Partition) (sql.RowIter, error) {
+	// TODO: Implement pg_enum row iter
+	return emptyRowIter()
+}
+
+// PkSchema implements the interface tables.Handler.
+func (p PgEnumHandler) PkSchema() sql.PrimaryKeySchema {
+	return sql.PrimaryKeySchema{
+		Schema:     pgEnumSchema,
+		PkOrdinals: nil,
+	}
+}
+
+// pgEnumSchema is the schema for pg_enum.
+var pgEnumSchema = sql.Schema{
+	{Name: "oid", Type: pgtypes.Oid, Default: nil, Nullable: false, Source: PgEnumName},
+	{Name: "enumtypid", Type: pgtypes.Oid, Default: nil, Nullable: false, Source: PgEnumName},
+	{Name: "enumsortorder", Type: pgtypes.Float32, Default: nil, Nullable: false, Source: PgEnumName},
+	{Name: "enumlabel", Type: pgtypes.Name, Default: nil, Nullable: false, Source: PgEnumName},
+}
+
+// TODO: add unique constraint "pg_enum_typid_label_index"
+
+// pgEnumRowIter is the sql.RowIter for the pg_enum table.
+type pgEnumRowIter struct {
+}
+
+var _ sql.RowIter = (*pgEnumRowIter)(nil)
+
+// Next implements the interface sql.RowIter.
+func (iter *pgEnumRowIter) Next(ctx *sql.Context) (sql.Row, error) {
+	return nil, io.EOF
+}
+
+// Close implements the interface sql.RowIter.
+func (iter *pgEnumRowIter) Close(ctx *sql.Context) error {
+	return nil
+}