[GitHub] [incubator-doris] xionglei0 opened a new issue #1809: support udtf：user defined table generation

[GitBox <gi...@apache.org>]

xionglei0 opened a new issue #1809: support udtf：user defined table generation
URL: https://github.com/apache/incubator-doris/issues/1809
 
 
   we need to explode one line to multi lines,like json string or array string
   this is what udtf do， like table test_udtf:
   **select * from test_udtf;**
   +-------------+------------+--+
   |   pageid    | adid_list  |
   +-------------+------------+--+
   | front_page  | [1,2,3]    |
   | end_page    | [4,3,6]    |
   +-------------+------------+--+
   
   hive implements udtf  like this:
   grammer one: **select pageid, score from test_udtf1 lateral view explode(adid_list) scores as score;**
   Grammer two: **select pageid, explode(adid_list)  as score from test_udtf ;**
   +-------------+--------+--+
   |   pageid    | score  |
   +-------------+--------+--+
   | front_page  | 1      |
   | front_page  | 2      |
   | front_page  | 3      |
   | end_page    | 4      |
   | end_page    | 3      |
   | end_page    | 6      |
   +-------------+--------+--+
   
   

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