[GitHub] [hudi] scxwhite opened a new pull request, #7236: [MINOR] Fix the npe caused by alter table add column.

[GitBox]

scxwhite opened a new pull request, #7236:
URL: https://github.com/apache/hudi/pull/7236

   ### Change Logs
   We put the public configuration in the file 
/etc/hudi/conf/hudi-defaults.conf，When the optimistic lock is opened, `alter 
table add column`  command will cause npe.
   
   
![image](https://user-images.githubusercontent.com/23207189/202611981-784680e5-1b33-42a3-9afb-74a13807b222.png)
   
   Then I found that because BaseHoodieWriteClient # preWrite was not executed 
in the AlterHoodieTableAddColumnsCommand class, 
pendingInflightAndRequestedInstants was not initialized. So submit this pr to 
fix it.
   <img width="1380" alt="image" 
src="https://user-images.githubusercontent.com/23207189/202612457-cb94c86a-4ae0-4a89-a124-0faae0dccb1a.png";>
   
   ### Impact
   
   alter table add/change column with optimistic lock is opened.
   ### Risk level (write none, low medium or high below)
   
   low
   
   ### Documentation Update
   
   
   ### Contributor's checklist
   
   - [ ] Read through [contributor's 
guide](https://hudi.apache.org/contribute/how-to-contribute)
   - [ ] Change Logs and Impact were stated clearly
   - [ ] Adequate tests were added if applicable
   - [ ] CI passed
   


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