chore: import upstream snapshot with attribution

server/expression/table_to_composite.go

@@ -0,0 +1,113 @@
+// 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 (
+	"fmt"
+
+	"github.com/cockroachdb/errors"
+	"github.com/dolthub/go-mysql-server/sql"
+
+	"github.com/dolthub/doltgresql/core"
+	"github.com/dolthub/doltgresql/core/id"
+	pgtypes "github.com/dolthub/doltgresql/server/types"
+)
+
+// TableToComposite is a set of sql.Expressions wrapped together in a single value.
+type TableToComposite struct {
+	fields []sql.Expression
+	typ    *pgtypes.DoltgresType
+}
+
+var _ sql.Expression = (*TableToComposite)(nil)
+
+// NewTableToComposite creates a new composite table type.
+func NewTableToComposite(ctx *sql.Context, tableName string, fields []sql.Expression) (sql.Expression, error) {
+	coll, err := core.GetTypesCollectionFromContext(ctx, "")
+	if err != nil {
+		return nil, err
+	}
+	// TODO: we need to get the schema, but the GMS builder doesn't have that information
+	typ, err := coll.GetType(ctx, id.NewType("", tableName))
+	if err != nil {
+		return nil, err
+	}
+	if typ == nil {
+		return nil, errors.New(fmt.Sprintf(`could not create a composite type for table "%s"`, tableName))
+	}
+	return &TableToComposite{
+		fields: fields,
+		typ:    typ,
+	}, nil
+}
+
+// Resolved implements the sql.Expression interface.
+func (t *TableToComposite) Resolved() bool {
+	for _, expr := range t.fields {
+		if !expr.Resolved() {
+			return false
+		}
+	}
+	return true
+}
+
+// String implements the sql.Expression interface.
+func (t *TableToComposite) String() string {
+	return "TABLE TO COMPOSITE"
+}
+
+// Type implements the sql.Expression interface.
+func (t *TableToComposite) Type(ctx *sql.Context) sql.Type {
+	return t.typ
+}
+
+// IsNullable implements the sql.Expression interface.
+func (t *TableToComposite) IsNullable(ctx *sql.Context) bool {
+	return false
+}
+
+// Eval implements the sql.Expression interface.
+func (t *TableToComposite) Eval(ctx *sql.Context, row sql.Row) (interface{}, error) {
+	vals := make([]pgtypes.RecordValue, len(t.fields))
+	for i, expr := range t.fields {
+		val, err := expr.Eval(ctx, row)
+		if err != nil {
+			return nil, err
+		}
+
+		typ, ok := expr.Type(ctx).(*pgtypes.DoltgresType)
+		if !ok {
+			return nil, fmt.Errorf("expected a DoltgresType, but got %T", expr.Type(ctx))
+		}
+		vals[i] = pgtypes.RecordValue{
+			Value: val,
+			Type:  typ,
+		}
+	}
+
+	return vals, nil
+}
+
+// Children implements the sql.Expression interface.
+func (t *TableToComposite) Children() []sql.Expression {
+	return t.fields
+}
+
+// WithChildren implements the sql.Expression interface.
+func (t *TableToComposite) WithChildren(ctx *sql.Context, children ...sql.Expression) (sql.Expression, error) {
+	tCopy := *t
+	tCopy.fields = children
+	return &tCopy, nil
+}