[Backport] bugfix: when building materialized-view, if taskCount>1, may cause concurrentModificationException#7165
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clintropolis merged 1 commit intoapache:0.14.0-incubatingfrom Mar 1, 2019
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…ncurrentModificationException (apache#6690) * bugfix: when building materialized-view, if taskCount >1, may cause ConcurrentModificationException * remove entry after iteration instead of using ConcurrentMap, and add unit test * small change * modify unit test for coverage * remove unused method
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Backport #6690 to 0.14.0-incubating