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Optimizing memory usage in expr computation #1184

@chenhao7253886

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@chenhao7253886

Now the memory used in expr is freed in close(), a lot of of memory is not freed when PlanNode is running, which causes delays in allocating memory and inadequate use of memory. I plan to improve it by freeing memroy in every getNext.

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area/sql/executionIssues or PRs related to the execution enginekind/fixCategorizes issue or PR as related to a bug.

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