刪除連續出現的資料

瀏覽日誌中會出現一些重複的資料，在清洗資料的需要刪除連續出現的頁面

1: 建表

create

table temp.
kaka_test
(    cuid string,
timestamp string,
pagename string,
elementid string,
eventtype string
)

insert into table hive. temp.kaka_test

select '1111'
as cuid,
'1572623111'
as timestamp,
'home'
as pagename,
'pv'
as elementid,
'view'
as eventtype
union all
select '1111'
as cuid,
1572623112
as timestamp,
'goodsdetail'
as pagename,
'pv'
as elementid,
'view'
as eventtype
union all
select '1111'
as cuid,
1572623113
as timestamp,
'mine'
as pagename,
'pv'
as elementid,
'view'
as eventtype
union all
select '1111'
as cuid,
1572623114
as timestamp,
'goodsdetail'
as pagename,
'pv'
as elementid,
'view'
as eventtype
union all
select '1111'
as cuid,
1572623115
as timestamp,
'goodsdetail'
as pagename,
'pv'
as elementid,
'view'
as eventtype
union all
select '1111'
as cuid,
1572623116
as timestamp,
'goodsdetail'
as pagename,
'pv'
as elementid,
'view'
as eventtype
union all
select '1111'
as cuid,
1572623117
as timestamp,
'cart'
as pagename,
'pv'
as elementid,
'view'
as eventtype
union all
select '1111'
as cuid,
1572623118
as timestamp,
'home'
as pagename,
'pv'
as elementid,
'view'
as eventtype;

4:排序 rank，lag取出每個頁面的上個頁面

5:過濾掉頁面和上個頁面相同的就可以了

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