morningman opened a new pull request #3146: [Bug] Get NPE when executing show 
alter table statement
URL: https://github.com/apache/incubator-doris/pull/3146
 
 
   This PR #3130 will clear some structures of alter job after job is done.
   But these structures may be used in show alter table statement. So
   that they can not be cleared.
   
   In this CL, I removed the `clear()` method of alter job. And add a new edit 
log
   `REMOVE_ALTER_JOB` to notify non-master FE that the expired alter job
   has been removed.
   
   Also add a new proc node for schema change job, for viewing the unfinished 
task of
   a schema change job.
   
   ISSUE: #3145 

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