suxiaogang223 opened a new pull request, #32438: URL: https://github.com/apache/doris/pull/32438
## Proposed changes backport: https://github.com/apache/doris/pull/31128 This optimization allows doris to correctly read struct type data after changing the schema from hive. ## Changing struct schema in hive: ```sql hive> create table struct_test(id int,sf struct<f1: int, f2: string>) stored as parquet; hive> insert into struct_test values > (1, named_struct('f1', 1, 'f2', 's1')), > (2, named_struct('f1', 2, 'f2', 's2')), > (3, named_struct('f1', 3, 'f2', 's3')); hive> alter table struct_test change sf sf struct<f1:int, f3:string>; hive> select * from struct_test; OK 1 {"f1":1,"f3":null} 2 {"f1":2,"f3":null} 3 {"f1":3,"f3":null} Time taken: 5.298 seconds, Fetched: 3 row(s) ``` The previous result of doris was: ```sql mysql> select * from struct_test; +------+-----------------------+ | id | sf | +------+-----------------------+ | 1 | {"f1": 1, "f3": "s1"} | | 2 | {"f1": 2, "f3": "s2"} | | 3 | {"f1": 3, "f3": "s3"} | +------+-----------------------+ ``` Now the result is same as hive: ```sql mysql> select * from struct_test; +------+-----------------------+ | id | sf | +------+-----------------------+ | 1 | {"f1": 1, "f3": null} | | 2 | {"f1": 2, "f3": null} | | 3 | {"f1": 3, "f3": null} | +------+-----------------------+ ``` -- This is an automated message from the Apache Git Service. To respond to the message, please log on to GitHub and use the URL above to go to the specific comment. To unsubscribe, e-mail: commits-unsubscr...@doris.apache.org For queries about this service, please contact Infrastructure at: us...@infra.apache.org --------------------------------------------------------------------- To unsubscribe, e-mail: commits-unsubscr...@doris.apache.org For additional commands, e-mail: commits-h...@doris.apache.org
