[fix](alter) fix bug that fe crash because npe on rollupBatchTask #10943
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…ache#10943) Co-authored-by: caiconghui1 <caiconghui1@jd.com>
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Proposed changes
Issue Number: close #10808
Problem Summary:
fromJson method of gson will invoke the default constructor to provide default value for initializing new object.
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If this is a relatively large or complex change, kick off the discussion at dev@doris.apache.org by explaining why you chose the solution you did and what alternatives you considered, etc...