chore: import upstream snapshot with attribution

server/ast/create_view.go

@@ -0,0 +1,108 @@
+// 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 (
+	"strings"
+
+	"github.com/cockroachdb/errors"
+	vitess "github.com/dolthub/vitess/go/vt/sqlparser"
+
+	"github.com/dolthub/doltgresql/postgres/parser/sem/tree"
+)
+
+// nodeCreateView handles *tree.CreateView nodes.
+func nodeCreateView(ctx *Context, node *tree.CreateView) (*vitess.DDL, error) {
+	if node == nil {
+		return nil, nil
+	}
+	if node.Persistence.IsTemporary() {
+		return nil, errors.Errorf("CREATE TEMPORARY VIEW is not yet supported")
+	}
+	if node.IsRecursive {
+		return nil, errors.Errorf("CREATE RECURSIVE VIEW is not yet supported")
+	}
+	var checkOption = tree.ViewCheckOptionUnspecified
+	var sqlSecurity string
+	if node.Options != nil {
+		for _, opt := range node.Options {
+			switch strings.ToLower(opt.Name) {
+			case "check_option":
+				switch strings.ToLower(opt.CheckOpt) {
+				case "local":
+					checkOption = tree.ViewCheckOptionLocal
+				case "cascaded":
+					checkOption = tree.ViewCheckOptionCascaded
+				default:
+					return nil, errors.Errorf(`"ERROR:  syntax error at or near "%s"`, opt.Name)
+				}
+			case "security_barrier":
+				if opt.Security {
+					return nil, errors.Errorf("CREATE VIEW '%s' = true option is not yet supported", opt.Name)
+				}
+			case "security_invoker":
+				if opt.Security {
+					sqlSecurity = "invoker"
+				} else {
+					sqlSecurity = "definer"
+				}
+			default:
+				return nil, errors.Errorf(`"ERROR:  syntax error at or near "%s"`, opt.Name)
+			}
+		}
+	}
+
+	if checkOption != tree.ViewCheckOptionUnspecified && node.CheckOption != tree.ViewCheckOptionUnspecified {
+		return nil, errors.Errorf(`ERROR:  parameter "check_option" specified more than once`)
+	} else {
+		checkOption = node.CheckOption
+	}
+
+	vCheckOpt := vitess.ViewCheckOptionUnspecified
+	switch checkOption {
+	case tree.ViewCheckOptionCascaded:
+		vCheckOpt = vitess.ViewCheckOptionCascaded
+	case tree.ViewCheckOptionLocal:
+		vCheckOpt = vitess.ViewCheckOptionLocal
+	default:
+	}
+
+	tableName, err := nodeTableName(ctx, &node.Name)
+	if err != nil {
+		return nil, err
+	}
+	selectStmt, err := nodeSelect(ctx, node.AsSource)
+	if err != nil {
+		return nil, err
+	}
+	var cols = make(vitess.Columns, len(node.ColumnNames))
+	for i, col := range node.ColumnNames {
+		cols[i] = vitess.NewColIdent(col.String())
+	}
+
+	stmt := &vitess.DDL{
+		Action:    vitess.CreateStr,
+		OrReplace: node.Replace,
+		ViewSpec: &vitess.ViewSpec{
+			ViewName:    tableName,
+			ViewExpr:    selectStmt,
+			Columns:     cols,
+			Security:    sqlSecurity,
+			CheckOption: vCheckOpt,
+		},
+		SubStatementStr: node.AsSource.String(),
+	}
+	return stmt, nil
+}