return err
	}

	if c.AccessKey == "" {
		return jwtgo.NewValidationError("accessKey/sub missing",
			jwtgo.ValidationErrorClaimsInvalid)
	}

	return nil
}

// Map returns underlying low-level map claims.
func (c *MapClaims) Map() map[string]interface{} {
	if c == nil {
		return nil
	}
	return c.MapClaims
}

// MarshalJSON marshals the MapClaims struct

	// Translate doubled quotes
	*qi = QuotedIdentifier(strings.ReplaceAll(r, `""`, `"`))
	return nil
}

// Types representing AST of SQL statement. Only SELECT is supported.

// Select is the top level AST node type
type Select struct {
	Expression *SelectExpression `parser:"\"SELECT\" @@"`
	From       *TableExpression  `parser:"\"FROM\" @@"`
	Where      *Expression       `parser:"( \"WHERE\" @@ )?"`