if e.selectAST.Where == nil {
		return true, nil
	}
	value, err := e.selectAST.Where.evalNode(input, e.tableAlias)
	if err != nil {
		return false, err
	}

	b, ok := value.ToBool()
	if !ok {
		err = fmt.Errorf("WHERE expression did not return bool")
		return false, err
	}

	return b, nil
}

// AggregateRow - aggregates the input record. Applies only to