[GitHub] [incubator-doris] hxianshun opened a new issue #4084: [Bug]When run command `alter table set "bloom_filter_columns"=""`, FE crash

[GitBox <gi...@apache.org>]

hxianshun opened a new issue #4084:
URL: https://github.com/apache/incubator-doris/issues/4084


   **Describe the bug**
   I want to change bloom_filter_index to bitmap index, but I found that there is no way can do this.
   When I tried to cancel `bloom_filter_columns` config to run command like 'alter table XXX set ("bloom_filter_columns"="");', FE crash.
   fe.out:
   > Exception in thread "ConnectScheduler Check Timer" java.util.ConcurrentModificationException
   >         at java.util.HashMap$HashIterator.nextNode(HashMap.java:1445)
   >         at java.util.HashMap$ValueIterator.next(HashMap.java:1474)
   >         at org.apache.doris.qe.ConnectScheduler$TimeoutChecker.run(ConnectScheduler.java:71)
   >         at java.util.TimerThread.mainLoop(Timer.java:555)
   >         at java.util.TimerThread.run(Timer.java:505)
   
   **To Reproduce**
   1. Create a table with `bloom_filter_columns config`
   2. alter table XXX set ("bloom_filter_columns"="");
   3. FE will crash
   
   **Expected behavior**
   Forbid this operation or support this operation.
   
   **Additional context**
   Version 0.11.x or 0.12.x all appear.
   
   When create table with `bloom_filter_columns` config, users can not cancel or change `bloom_filter_columns` but only modify,
   Looking forward to support cancel or change `bloom_filter_columns` config.
   


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