chore: import upstream snapshot with attribution

server/expression/statement_runner.go

@@ -0,0 +1,74 @@
+// Copyright 2025 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 expression
+
+import (
+	"github.com/dolthub/go-mysql-server/sql"
+	"github.com/dolthub/go-mysql-server/sql/procedures"
+
+	pgtypes "github.com/dolthub/doltgresql/server/types"
+)
+
+// StatementRunner is an expression that can be added to a node to grab the statement runner.
+type StatementRunner struct {
+	Runner sql.StatementRunner
+}
+
+var _ sql.Expression = StatementRunner{}
+var _ procedures.InterpreterExpr = StatementRunner{}
+
+// Children implements the sql.Expression interface.
+func (StatementRunner) Children() []sql.Expression {
+	return nil
+}
+
+// Eval implements the sql.Expression interface.
+func (StatementRunner) Eval(ctx *sql.Context, row sql.Row) (any, error) {
+	return nil, nil
+}
+
+// IsNullable implements the sql.Expression interface.
+func (StatementRunner) IsNullable(ctx *sql.Context) bool {
+	return false
+}
+
+// Resolved implements the sql.Expression interface.
+func (StatementRunner) Resolved() bool {
+	return true
+}
+
+// SetStatementRunner implements the sql.Expression interface.
+func (sr StatementRunner) SetStatementRunner(ctx *sql.Context, runner sql.StatementRunner) sql.Expression {
+	sr.Runner = runner
+	return sr
+}
+
+// String implements the sql.Expression interface.
+func (StatementRunner) String() string {
+	return "StatementRunner"
+}
+
+// Type implements the sql.Expression interface.
+func (StatementRunner) Type(ctx *sql.Context) sql.Type {
+	return pgtypes.Unknown
+}
+
+// WithChildren implements the sql.Expression interface.
+func (sr StatementRunner) WithChildren(ctx *sql.Context, children ...sql.Expression) (sql.Expression, error) {
+	if len(children) != 0 {
+		return nil, sql.ErrInvalidChildrenNumber.New(sr, len(children), 0)
+	}
+	return sr, nil
+}