计算数据库中的数据之后，以键值对的形式存储在一个表里面

技术思路整理：
【1】先根据表中数据计算出需要的值，存储在临时表里面，比如计算日活跃度的语句：

with tbl_dau as 
            (
select 'dau' as name, count(distinct deviceid) as cnt
    from
    (
      select deviceid from src_huidu_zl.event3 where hdfs_par = '20170108'
      union all
      select deviceid from src_huidu_zl.page3 where hdfs_par = '20170108'
     ) as tmp
            )

另外，计算历史峰值的逻辑比较复杂，例子如下：

historymaxnewdev as(
                select if(regexp_extract(json_value, '\"maxnewdev\"\:(\\d+(\\.\\d+)*)',1)='','1',regexp_extract(json_value, '\"maxnewdev\"\:(\\d+(\\.\\d+)*)',1)) as historymaxvalue,if(regexp_extract(json_value, '\"maxnewdev\":(\"\\d+(\\.\\d+)*)\\|\\|(\\d{8})\"',3)='','19710101',regexp_extract(json_value, '\"maxnewdev\":(\"\\d+(\\.\\d+)*)\\|\\|(\\d{8})\"',3)) as historydate from ana_fx_goal.zl_daily_kv where json_key = 'daily_static' and hdfs_par='20170108'
            )

该行语句先从zl_daily_kv 表里面读取出历史峰值，通过正则表达式提取出新设备的历史峰值（提取前的格式为：677777||20161026，前面的数值可能带小数点），然后将历史峰值与今天的新数据对比，找出新的最大值，并更新相应的峰值。

【2】拼接JSON字符串

【3】以‘daily_static’为键值存储第二步的结果

下面是完整的程序：

    
insert overwrite ana_fx_goal.zl_daily_kv partition(hdfs_par='20170108')
select * from 
(
    select cast(
        concat(substr('20170108', 1, 4), '-', substr('20170108', 5, 2), '-', substr('20170108', 7, 2)) as timestamp)     as day_begin,
        NOW()                               as generate_time,
        'daily_static'                      as json_key,
        json_output                         as json_value
    from
    (
    select  concat( '{', 
            group_concat(
                    concat(wrapped_column_key, ':', wrapped_column_value), 
                    ','),
            '}'
        ) as json_output 
    from
    (       
        select 
            concat('"', name, '"') as wrapped_column_key,
            case
                when cnt is null then 'null'
                when 'double' = 'string' then concat('"', cast(cnt  as string), '"')
                else cast(cnt  as string)
            end as wrapped_column_value
        from 
        (
                    with tbl_dau as 
            (
                select 'dau' as name, count(distinct deviceid) as cnt
                from
                (
                    select deviceid from src_huidu_zl.event3 where hdfs_par = '20170108'
                    union all
                    select deviceid from src_huidu_zl.page3 where hdfs_par = '20170108'
                ) as tmp
            ),
            tbl_launchrecords as 
            (
                select 'launchrecords' as name, count(*) as cnt
                from
                src_huidu_zl.launch2 
                where hdfs_par = '20170108'
            ),
            tbl_newdev as
            (
                select 'newdev' as name, count(distinct deviceid) as cnt
                from ana_fx_middle.devappear2 
                where first_appear_hdfspar = '20170108' and hdfs_par = '20170108'
            ),
            tbl_avgusetime as 
            (
                select 'avgusetime' as name, avg(use_time) as cnt
                from src_huidu_zl.launch2 
                where hdfs_par = '20170108'
            ),
            tbl_avgdevtime as 
            (
                select 'avgdevtime' as name, sum(use_time)/count(distinct deviceid) as cnt
                from src_huidu_zl.launch2 
                where hdfs_par = '20170108'
            ),
            tbl_alldev as 
            (
                select 'alldev' as name, count(distinct deviceid) as cnt
                from ana_fx_middle.devappear2 
                where hdfs_par = '20170108'
            ),
            tbl_mau as 
            (
                select 'mau' as name, count(distinct deviceid) as cnt
                from
                (
                    select deviceid from src_huidu_zl.event3 where hdfs_par  between '20161211' and '20170108'
                    union all
                    select deviceid from src_huidu_zl.page3 where hdfs_par  between '20161211' and '20170108'
                ) as tmp
            ),
            tbl_avglaunchrecords as 
            (
                select 'avglaunchrecords' as name, count(*)/count(distinct deviceid) as cnt
                from src_huidu_zl.launch2
                where hdfs_par = '20170108'
            ),
            tbl_launchdays as 
            (
                select sum(cnt) as cnt
                from
                (
                select hdfs_par, count(distinct deviceid) as cnt
                from src_huidu_zl.launch2
                where hdfs_par between '20161211' and '20170108'
                group by hdfs_par
                ) as tmp
            ),
            tbl_launchdevs as 
            (
                select count(distinct deviceid) as cnt
                from src_huidu_zl.launch2
                where hdfs_par between '20161211' and '20170108'
            ),
            tbl_28new7retain as
            (
                select '28new7retain' as name, count(distinct tbl_7day.deviceid) as cnt
                from
                (
                    select deviceid from src_huidu_zl.event3 where hdfs_par  between '20170101' and '20170108'
                    union all
                    select deviceid from src_huidu_zl.page3 where hdfs_par  between '20170101' and '20170108'
                ) as tbl_7day
                left join
                (
                    select distinct deviceid as deviceid
                    from ana_fx_middle.devappear2  
                    where first_appear_hdfspar = '20161211'
                ) as tbl_28day
                on tbl_7day.deviceid = tbl_28day.deviceid 
                where tbl_28day.deviceid != 'NULL'
            ),
            tbl_28new as 
            (
                select '28new' as name, count(distinct deviceid) as cnt
                from ana_fx_middle.devappear2  
                where first_appear_hdfspar = '20161211'
            ),
            historymaxdauvalue as(
                select if(regexp_extract(json_value, '\"maxdau\"\:(\\d+(\\.\\d+)*)',1)='','1',regexp_extract(json_value, '\"maxdau\"\:(\\d+(\\.\\d+)*)',1)) as historymaxvalue,if(regexp_extract(json_value, '\"maxdau\":(\"\\d+(\\.\\d+)*)\\|\\|(\\d{8})\"',3)='','19710101',regexp_extract(json_value, '\"maxdau\":(\"\\d+(\\.\\d+)*)\\|\\|(\\d{8})\"',3)) as historydate from ana_fx_goal.zl_daily_kv where json_key = 'daily_static' and hdfs_par='20170108'
            ),
            historymaxlaunchrecords as(
                select if(regexp_extract(json_value, '\"maxlaunchrecords\"\:(\\d+(\\.\\d+)*)',1)='','1',regexp_extract(json_value, '\"maxlaunchrecords\"\:(\\d+(\\.\\d+)*)',1)) as historymaxvalue,if(regexp_extract(json_value, '\"maxlaunchrecords\":(\"\\d+(\\.\\d+)*)\\|\\|(\\d{8})\"',3)='','19710101',regexp_extract(json_value, '\"maxlaunchrecords\":(\"\\d+(\\.\\d+)*)\\|\\|(\\d{8})\"',3)) as historydate from ana_fx_goal.zl_daily_kv where json_key = 'daily_static' and hdfs_par='20170108'
            ),
            historymaxnewdev as(
                select if(regexp_extract(json_value, '\"maxnewdev\"\:(\\d+(\\.\\d+)*)',1)='','1',regexp_extract(json_value, '\"maxnewdev\"\:(\\d+(\\.\\d+)*)',1)) as historymaxvalue,if(regexp_extract(json_value, '\"maxnewdev\":(\"\\d+(\\.\\d+)*)\\|\\|(\\d{8})\"',3)='','19710101',regexp_extract(json_value, '\"maxnewdev\":(\"\\d+(\\.\\d+)*)\\|\\|(\\d{8})\"',3)) as historydate from ana_fx_goal.zl_daily_kv where json_key = 'daily_static' and hdfs_par='20170108'
            ),
            historymaxavgusetime as (
                select if(regexp_extract(json_value, '\"maxavgusetime\"\:(\\d+(\\.\\d+)*)',1)='','1',regexp_extract(json_value, '\"maxavgusetime\"\:(\\d+(\\.\\d+)*)',1)) as historymaxvalue,if(regexp_extract(json_value, '\"maxavgusetime\":(\"\\d+(\\.\\d+)*)\\|\\|(\\d{8})\"',3)='','19710101',regexp_extract(json_value, '\"maxavgusetime\":(\"\\d+(\\.\\d+)*)\\|\\|(\\d{8})\"',3)) as historydate from ana_fx_goal.zl_daily_kv where json_key = 'daily_static' and hdfs_par='20170108'
            ),
            historymaxavgdevtime as (
                select if(regexp_extract(json_value, '\"maxavgdevtime\"\:(\\d+(\\.\\d+)*)',1)='','1',regexp_extract(json_value, '\"maxavgdevtime\"\:(\\d+(\\.\\d+)*)',1)) as historymaxvalue,if(regexp_extract(json_value, '\"maxavgdevtime\":(\"\\d+(\\.\\d+)*)\\|\\|(\\d{8})\"',3)='','19710101',regexp_extract(json_value, '\"maxavgdevtime\":(\"\\d+(\\.\\d+)*)\\|\\|(\\d{8})\"',3)) as historydate from ana_fx_goal.zl_daily_kv where json_key = 'daily_static' and hdfs_par='20170108'
            )
            select name,cast(cnt as string) as cnt from tbl_dau
            union all
            select name,cast(cnt as string) as cnt from tbl_launchrecords
            union all
            select name,cast(cnt as string) as cnt from tbl_newdev
            union all
            select name,cast(cnt as string) as cnt from tbl_avgusetime
            union all
            select name,cast(cnt as string) as cnt from tbl_avgdevtime
            union all
            select name,cast(cnt as string) as cnt from tbl_alldev
            union all
            select name,cast(cnt as string) as cnt from tbl_mau
            union all 
            select name,cast(cnt as string) as cnt from tbl_avglaunchrecords
            union all 
            select 'avglaunchdays' as name, cast((tbl_launchdays.cnt/tbl_launchdevs.cnt) as string)  as cnt from tbl_launchdays, tbl_launchdevs
            union all
            select 'retainratio' as name,   cast((tbl_28new7retain.cnt/tbl_28new.cnt) as string) as cnt from tbl_28new, tbl_28new7retain
            union all
            select 'maxdau' as name, if(tbl_dau.cnt>cast(historymaxdauvalue.historymaxvalue as bigint),concat(cast(tbl_dau.cnt as string),'||','20170108'),concat(historymaxdauvalue.historymaxvalue,'||',historydate)) as cnt from tbl_dau,historymaxdauvalue
            union all
            select 'maxlaunchrecords' as name, if(tbl_launchrecords.cnt>cast(historymaxlaunchrecords.historymaxvalue as bigint),concat(cast(tbl_launchrecords.cnt as string),'||','20170108'),concat(historymaxlaunchrecords.historymaxvalue,'||',historydate)) as cnt from tbl_launchrecords,historymaxlaunchrecords
            union all
            select 'maxnewdev' as name, if(tbl_newdev.cnt>cast(historymaxnewdev.historymaxvalue as bigint),concat(cast(tbl_newdev.cnt as string),'||','20170108'),concat(historymaxnewdev.historymaxvalue,'||',historydate)) as cnt from tbl_newdev,historymaxnewdev
            union all 
            select 'maxavgusetime' as name, if(tbl_avgusetime.cnt>cast(historymaxavgusetime.historymaxvalue as bigint),concat(cast(tbl_avgusetime.cnt as string),'||','20170108'),concat(historymaxavgusetime.historymaxvalue,'||',historydate)) as cnt from tbl_avgusetime,historymaxavgusetime
            union all 
            select 'maxavgusetime' as name, if(tbl_avgdevtime.cnt>cast(historymaxavgdevtime.historymaxvalue as bigint),concat(cast(tbl_avgdevtime.cnt as string),'||','20170108'),concat(historymaxavgdevtime.historymaxvalue,'||',historydate)) as cnt from tbl_avgdevtime,historymaxavgdevtime
            
    
    
        ) as tmp1_B
    ) as tmp2_B
    
    


    ) as tmp
    limit 1
) as t1
union all
select * from 
(
    select
        day_begin,
        generate_time,
        json_key,
        json_value
    from ana_fx_goal.zl_daily_kv
    where hdfs_par = '20170108'
        and json_key != 'daily_static'
) as t2
;