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[improvment](planner) unset common fields to reduce plan thrift size (#…
…12495) 1. For query with 1656 union, the plan thrift size will be reduced from 400MB+ to 2MB. This optimization is introduced from #4904, but lost after #9720 2. Disable ExprSubstitutionMap.verify when debug is disable. So that the plan time of query with 1656 union will be reduced from 20s to 2s
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