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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