Major Description
Following code is example for doing MERGE INTO along with schema evolution which is not yet supported by hudi. Currently, Hudi tries to use target table schema during MERGE INTO.
Following code should be supported -
```
create table test_insert3 (
id int,
name string,
updated_at timestamp
) using hudi
options (
type = 'cow',
primaryKey = 'id',
preCombineField = 'updated_at'
) location 'file:///tmp/test_insert3';
merge into test_insert3 as target
using (
select 1 as id, 'c' as name, 1 as new_col, current_timestamp as updated_at
) source
on target.id = source.id
when matched then update set target.new_col = source.new_col
when not matched then insert *;
```