long guess = (long) Math.sqrt((double) x);
    // Note: guess is always <= FLOOR_SQRT_MAX_LONG.
    long guessSquared = guess * guess;
    // Note (2013-2-26): benchmarks indicate that, inscrutably enough, using if statements is
    // faster here than using lessThanBranchFree.
    switch (mode) {
      case UNNECESSARY:
        checkRoundingUnnecessary(guessSquared == x);
        return guess;
      case FLOOR:
      case DOWN:

			subdb := v.Session(&Session{Logger: logger.Discard, DryRun: true}).getInstance()
			if v.Statement.SQL.Len() > 0 {
				var (
					vars = subdb.Statement.Vars
					sql  = v.Statement.SQL.String()
				)

				subdb.Statement.Vars = make([]interface{}, 0, len(vars))
				for _, vv := range vars {
					subdb.Statement.Vars = append(subdb.Statement.Vars, vv)
					bindvar := strings.Builder{}

		err := expr.aggregateRow(input, e.tableAlias)
		if err != nil {
			return err
		}
	}
	return nil
}

// Eval - evaluates the Select statement for the given record. It
// applies only to non-aggregation queries.
// The function returns whether the statement passed the WHERE clause and should be outputted.
func (e *SelectStatement) Eval(input, output Record) (Record, error) {
	ok, err := e.isPassingWhereClause(input)

/*
Implementation details.

Cgo provides a way for Go programs to call C code linked into the same
address space. This comment explains the operation of cgo.

Cgo reads a set of Go source files and looks for statements saying
import "C". If the import has a doc comment, that comment is
taken as literal C code to be used as a preamble to any C code
generated by cgo. A typical preamble #includes necessary definitions:

	GormDBDataType(*gorm.DB, *schema.Field) string
}

// RunWithValue run migration with statement value
func (m Migrator) RunWithValue(value interface{}, fc func(*gorm.Statement) error) error {
	stmt := &gorm.Statement{DB: m.DB}
	if m.DB.Statement != nil {
		stmt.Table = m.DB.Statement.Table
		stmt.TableExpr = m.DB.Statement.TableExpr
	}

	if table, ok := value.(string); ok {
		stmt.Table = table

		}

		if isRows, ok := db.Get("rows"); ok && isRows.(bool) {
			db.Statement.Settings.Delete("rows")
			db.Statement.Dest, db.Error = db.Statement.ConnPool.QueryContext(db.Statement.Context, db.Statement.SQL.String(), db.Statement.Vars...)
		} else {
			db.Statement.Dest = db.Statement.ConnPool.QueryRowContext(db.Statement.Context, db.Statement.SQL.String(), db.Statement.Vars...)
		}

		db.RowsAffected = -1
	}

	r := dryDB.Table("`user`").Find(&User{}).Statement
	if !regexp.MustCompile("SELECT \\* FROM `user`").MatchString(r.Statement.SQL.String()) {
		t.Errorf("Table with escape character, got %v", r.Statement.SQL.String())
	}

	r = dryDB.Table("user as u").Select("name").Find(&User{}).Statement
	if !regexp.MustCompile("SELECT .name. FROM user as u WHERE .u.\\..deleted_at. IS NULL").MatchString(r.Statement.SQL.String()) {

		if db.Statement.Schema != nil {
			if !db.Statement.Unscoped {
				for _, c := range db.Statement.Schema.CreateClauses {
					db.Statement.AddClause(c)
				}
			}

			if supportReturning && len(db.Statement.Schema.FieldsWithDefaultDBValue) > 0 {
				if _, ok := db.Statement.Clauses["RETURNING"]; !ok {
					fromColumns := make([]clause.Column, 0, len(db.Statement.Schema.FieldsWithDefaultDBValue))

			j := join{
				Name: query, Conds: args, Selects: db.Statement.Selects,
				Omits: db.Statement.Omits, JoinType: joinType,
			}
			if where, ok := db.Statement.Clauses["WHERE"].Expression.(clause.Where); ok {
				j.On = &where
			}
			tx.Statement.Joins = append(tx.Statement.Joins, j)
			return
		}
	}

	tx.Statement.Joins = append(tx.Statement.Joins, join{Name: query, Conds: args, JoinType: joinType})
	return

	tx := db.Session(&gorm.Session{NewDB: true})
	if called := fc(db.Statement.ReflectValue.Interface(), tx); !called {
		switch db.Statement.ReflectValue.Kind() {
		case reflect.Slice, reflect.Array:
			db.Statement.CurDestIndex = 0
			for i := 0; i < db.Statement.ReflectValue.Len(); i++ {
				if value := reflect.Indirect(db.Statement.ReflectValue.Index(i)); value.CanAddr() {
					fc(value.Addr().Interface(), tx)
				} else {