[fix](storage) Using unique_ptr to refactor some class members #7933
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Proposed changes
Using unique_ptr to refactor some class members.
Fix mem leak for
SegmengIterator
's_pre_eval_block_predicate
.Problem Summary:
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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...