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From "Chaozhong Yang (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HIVE-17460) `insert overwrite` should support table schema evolution (e.g. add columns)
Date Wed, 06 Sep 2017 04:42:00 GMT
Chaozhong Yang created HIVE-17460:
-------------------------------------

             Summary: `insert overwrite` should support table schema evolution (e.g. add columns)
                 Key: HIVE-17460
                 URL: https://issues.apache.org/jira/browse/HIVE-17460
             Project: Hive
          Issue Type: Bug
    Affects Versions: 2.2.0, 2.1.0
            Reporter: Chaozhong Yang
            Assignee: Chaozhong Yang
             Fix For: 3.0.0


In Hive, adding columns into original table is a common use case. However, If we insert overwrite
older partitions after adding columns, added columns will not be accessed.

```
create table src_table(
        i int
)
PARTITIONED BY (`date` string);

insert overwrite table src_table partition(`date`='20170905') valu
es (3);

select * from src_table where `date` = '20170905';

alter table src_table add columns (bi bigint);

insert overwrite table src_table partition(`date`='20170905') valu
es (3, 5);

select * from src_table where `date` = '20170905';
```
The result will be as follows:

```
3, NULL, '20170905'
```
Obviously, it doesn't meet our expectation. The expected result should be:

```
3, 5, '20170905'
```





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