生成从去年一月一号，到本月的月时间表

posexplode用法：

lateral view 表别名 as 序号列名,数组中的元素的名

1、生成序列

SELECT time_stamp_fist_day_of_last_year,--去年第一天的时间戳numfrom(SELECTsplit(repeat_o,',') o_array,time_stamp_fist_day_of_last_yearfrom(SELECTconcat(repeat('o,',sub_momth_num),'o') repeat_o,--因为posexplode序号从0开始所以多拼一个time_stamp_fist_day_of_last_yearfrom(SELECT datediff(time_stamp_yestoday,time_stamp_fist_day_of_last_year,'MM')sub_momth_num,time_stamp_fist_day_of_last_yearfrom(selectto_date(${bizdate},'yyyyMMdd') time_stamp_yestoday,--昨天的时间戳to_date(concat(cast(SUBSTR(${bizdate},1,4) as int )-1,'0101'),'yyyyMMdd') time_stamp_fist_day_of_last_year --去年第一天的时间戳)t1)t2)t3)t4 LATERAL view posexplode(o_array) t5 as num,val;

2、结果 

SELECT
date_format(new_date,'yyyy-MM') year_month
from
(SELECT dateadd(time_stamp_fist_day_of_last_year,num,'MM') new_datefrom(SELECT time_stamp_fist_day_of_last_year,--去年第一天的时间戳numfrom(SELECTsplit(repeat_o,',') o_array,time_stamp_fist_day_of_last_yearfrom(SELECTconcat(repeat('o,',sub_momth_num),'o') repeat_o,--因为posexplode序号从0开始所以多拼一个time_stamp_fist_day_of_last_yearfrom(SELECT datediff(time_stamp_yestoday,time_stamp_fist_day_of_last_year,'MM')sub_momth_num,time_stamp_fist_day_of_last_yearfrom(selectto_date(${bizdate},'yyyyMMdd') time_stamp_yestoday,--昨天的时间戳to_date(concat(cast(SUBSTR(${bizdate},1,4) as int )-1,'0101'),'yyyyMMdd') time_stamp_fist_day_of_last_year --去年第一天的时间戳)t1)t2)t3)t4 LATERAL view posexplode(o_array) t5 as num,val)t6
)t7
;