原生函数from_unixtime(BIGINT unixtime [, STRING format])使用时间戳为标准unix时间戳，单位必须是秒，但是一般在入库中，基础数据存入的都是13位的毫秒时间戳，例如startdate为BIGINT格式，转化为秒，startdate/1000，但结果变为DOUBLE格式，此时先用cast进行转换，
from_unixtime(cast(startdate/1000 as bigint)) as new_startdate #例如如下sql用例： select startdate,from_unixtime(cast(startdate/1000 as bigint),'yyyy-MM-dd HH:mm:ss') as new_startdate from sip where day=20210903 and hour='10' limit 10;
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