chore: import upstream snapshot with attribution

server/ast/alter_sequence.go

@@ -0,0 +1,102 @@
+// Copyright 2023 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 (
+	"fmt"
+
+	"github.com/cockroachdb/errors"
+	vitess "github.com/dolthub/vitess/go/vt/sqlparser"
+
+	"github.com/dolthub/doltgresql/postgres/parser/sem/tree"
+	"github.com/dolthub/doltgresql/server/auth"
+	pgnodes "github.com/dolthub/doltgresql/server/node"
+)
+
+// nodeAlterSequence handles *tree.AlterSequence nodes.
+func nodeAlterSequence(ctx *Context, node *tree.AlterSequence) (vitess.Statement, error) {
+	if node == nil {
+		return nil, nil
+	}
+
+	var warnings []string
+	if len(node.Owner) > 0 {
+		// We intentionally don't support OWNER TO since we don't support owning objects
+		if len(node.Options) == 0 {
+			return NewNoOp("OWNER TO is unsupported and ignored"), nil
+		} else {
+			warnings = append(warnings, "OWNER TO is unsupported and ignored")
+		}
+	}
+	if node.SetLog {
+		return NotYetSupportedError("LOGGED and UNLOGGED are not yet supported")
+	}
+
+	nodeName := node.Name.ToTableName()
+	name, err := nodeTableName(ctx, &nodeName)
+	if err != nil {
+		return nil, err
+	}
+	if len(name.DbQualifier.String()) > 0 {
+		return NotYetSupportedError("ALTER SEQUENCE does not yet support specifying the database")
+	}
+
+	ownedBy := pgnodes.AlterSequenceOwnedBy{}
+	for _, option := range node.Options {
+		switch option.Name {
+		case tree.SeqOptOwnedBy:
+			ownedBy.IsSet = true
+			// OWNED BY NONE is valid, so we have to check if a column was provided
+			if option.ColumnItemVal != nil {
+				expr, err := nodeExpr(ctx, option.ColumnItemVal)
+				if err != nil {
+					return nil, err
+				}
+				colName, ok := expr.(*vitess.ColName)
+				if !ok {
+					return nil, errors.New("expected sequence owner to be a table and column name")
+				}
+				if colName.Qualifier.SchemaQualifier.String() != name.SchemaQualifier.String() {
+					return nil, errors.New("ALTER SEQUENCE must use the same schema for the sequence and owned table")
+				}
+				if len(colName.Qualifier.DbQualifier.String()) > 0 {
+					return nil, errors.New("database specification is not yet supported for sequences")
+				}
+				if len(colName.Name.String()) == 0 || len(colName.Qualifier.Name.String()) == 0 {
+					return nil, errors.New("invalid OWNED BY option")
+				}
+				ownedBy.Table = colName.Qualifier.Name.String()
+				ownedBy.Column = colName.Name.String()
+			}
+		default:
+			return NotYetSupportedError(fmt.Sprintf("%s is not yet supported", option.Name))
+		}
+	}
+
+	return vitess.InjectedStatement{
+		Statement: pgnodes.NewAlterSequence(
+			node.IfExists,
+			name.SchemaQualifier.String(),
+			name.Name.String(),
+			ownedBy,
+			warnings...),
+		Children: nil,
+		Auth: vitess.AuthInformation{
+			AuthType:    auth.AuthType_UPDATE,
+			TargetType:  auth.AuthTargetType_SequenceIdentifiers,
+			TargetNames: []string{name.SchemaQualifier.String(), name.Name.String()},
+		},
+	}, nil
+}