您希望在数据集中包含以下句子。${IF(LEN(p_date) = 0 ,AND date_part(MONTH, "PreferredDate") BETWEEN 1 AND date_part(MONTH, current_date) , AND date_part(MONTH, "PreferredDate") BETWEEN 1 AND '${p_date}')}当为真时"AND DATE_PART('MONTH', "PreferredDate")BETWEEN 1 AND DATE_PART('MONTH',current_date)"。我想包含以下内容、PreferredDate 部分比较困难,因为它会改变变量。