for len(db.Statement.scopes) > 0 {
		db = db.executeScopes()
	}

	var (
		curTime           = time.Now()
		stmt              = db.Statement
		resetBuildClauses bool
	)

	if len(stmt.BuildClauses) == 0 {
		stmt.BuildClauses = p.Clauses
		resetBuildClauses = true
	}

	if optimizer, ok := db.Statement.Dest.(StatementModifier); ok {
		optimizer.ModifyStatement(stmt)
	}

	// assign model values

					defer delete(db.Statement.Clauses, "SET")
					db.Statement.AddClause(set)
				} else {
					return
				}
			}

			db.Statement.Build(db.Statement.BuildClauses...)
		}

		checkMissingWhereConditions(db)

		if !db.DryRun && db.Error == nil {
			if ok, mode := hasReturning(db, supportReturning); ok {

		if db.Statement.SQL.Len() == 0 {
			db.Statement.SQL.Grow(180)
			db.Statement.AddClauseIfNotExists(clause.Insert{})
			db.Statement.AddClause(ConvertToCreateValues(db.Statement))

			db.Statement.Build(db.Statement.BuildClauses...)
		}

		isDryRun := !db.DryRun && db.Error == nil
		if !isDryRun {
			return
		}

		ok, mode := hasReturning(db, supportReturning)
		if ok {
			if c, ok := db.Statement.Clauses["ON CONFLICT"]; ok {

			}

			db.Statement.AddClause(fromClause)
		} else {
			db.Statement.AddClauseIfNotExists(clause.From{})
		}

		db.Statement.AddClauseIfNotExists(clauseSelect)

		db.Statement.Build(db.Statement.BuildClauses...)
	}
}

func Preload(db *gorm.DB) {
	if db.Error == nil && len(db.Statement.Preloads) > 0 {
		if db.Statement.Schema == nil {
			db.AddError(fmt.Errorf("%w when using preload", gorm.ErrModelValueRequired))

	Table                string
	Model                interface{}
	Unscoped             bool
	Dest                 interface{}
	ReflectValue         reflect.Value
	Clauses              map[string]clause.Clause
	BuildClauses         []string
	Distinct             bool
	Selects              []string          // selected columns
	Omits                []string          // omit columns
	ColumnMapping        map[string]string // map columns