chore: import upstream snapshot with attribution

server/ast/drop_table.go

@@ -0,0 +1,60 @@
+// 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 (
+	"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"
+)
+
+// nodeDropTable handles *tree.DropTable nodes.
+func nodeDropTable(ctx *Context, node *tree.DropTable) (*vitess.DDL, error) {
+	if node == nil || len(node.Names) == 0 {
+		return nil, nil
+	}
+	switch node.DropBehavior {
+	case tree.DropDefault:
+		// Default behavior, nothing to do
+	case tree.DropRestrict:
+		return nil, errors.Errorf("RESTRICT is not yet supported")
+	case tree.DropCascade:
+		return nil, errors.Errorf("CASCADE is not yet supported")
+	}
+	tableNames := make([]vitess.TableName, len(node.Names))
+	authTableNames := make([]string, 0, len(node.Names)*3)
+	for i := range node.Names {
+		var err error
+		tableNames[i], err = nodeTableName(ctx, &node.Names[i])
+		if err != nil {
+			return nil, err
+		}
+		authTableNames = append(authTableNames,
+			tableNames[i].DbQualifier.String(), tableNames[i].SchemaQualifier.String(), tableNames[i].Name.String())
+	}
+	return &vitess.DDL{
+		Action:     vitess.DropStr,
+		FromTables: tableNames,
+		IfExists:   node.IfExists,
+		Auth: vitess.AuthInformation{
+			AuthType:    auth.AuthType_DROPTABLE,
+			TargetType:  auth.AuthTargetType_TableIdentifiers,
+			TargetNames: authTableNames,
+		},
+	}, nil
+}