return err
		}

		// convert join identity map to relation identity map
		fieldValues := make([]interface{}, len(joinForeignFields))
		joinFieldValues := make([]interface{}, len(joinRelForeignFields))
		for i := 0; i < joinResults.Len(); i++ {
			joinIndexValue := joinResults.Index(i)
			for idx, field := range joinForeignFields {
				fieldValues[idx], _ = field.ValueOf(tx.Statement.Context, joinIndexValue)
			}

type Fields interface {
	// Has returns whether the provided field exists.
	Has(field string) (exists bool)

	// Get returns the value for the provided field.
	Get(field string) (value string)
}

// Set is a map of field:value. It implements Fields.
type Set map[string]string

// String returns all fields listed as a human readable string.
// Conveniently, exactly the format that ParseSelector takes.
func (ls Set) String() string {

const scope=fieldValue.scope||tr.model.OBJECT_DEFAULT_SCOPE;const idRef=fieldValue.id_ref||fieldValue.idRef;const scopedId=new tr.model.ScopedId(scope,idRef);const pidRef=fieldValue.pid_ref||fieldValue.pidRef||pid;const ts=item[itemTimestampField];patchupsToApply.push({item,object,field:fieldName,pidRef,scopedId,ts});}...

				// all elements must have keys
				visited := make([]bool, len(fields))
				for _, e := range e.Elts {
					kv, _ := e.(*ast.KeyValueExpr)
					if kv == nil {
						check.error(e, MixedStructLit, "mixture of field:value and value elements in struct literal")
						continue
					}
					key, _ := kv.Key.(*ast.Ident)
					// do all possible checks early (before exiting due to errors)
					// so we don't drop information on the floor

			for i, n := range ls {
				ir.SetPos(n)

				sk, ok := n.(*ir.StructKeyExpr)
				if !ok {
					kv, ok := n.(*ir.KeyExpr)
					if !ok {
						if !errored {
							base.Errorf("mixture of field:value and value initializers")
							errored = true
						}
						ls[i] = Expr(n)
						continue
					}

					sk = tcStructLitKey(t, kv)
					if sk == nil {
						continue
					}

				visited := make([]bool, len(fields))
				for _, e := range e.ElemList {
					kv, _ := e.(*syntax.KeyValueExpr)
					if kv == nil {
						check.error(e, MixedStructLit, "mixture of field:value and value elements in struct literal")
						continue
					}
					key, _ := kv.Key.(*syntax.Name)
					// do all possible checks early (before exiting due to errors)