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https://issues.apache.org/jira/browse/IMPALA-11073?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Wenzhe Zhou closed IMPALA-11073.
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Resolution: Won't Do
> Planner state verification for replan
> -------------------------------------
>
> Key: IMPALA-11073
> URL: https://issues.apache.org/jira/browse/IMPALA-11073
> Project: IMPALA
> Issue Type: Sub-task
> Components: Frontend
> Affects Versions: Impala 4.1.0
> Reporter: Wenzhe Zhou
> Assignee: Wenzhe Zhou
> Priority: Major
>
> In replan implementation v2, we make copies of the query tree (PlanNode) and
> planner context (PlannerContext) for each iteration since planner state in
> these objects are modified when making distributed plan in
> DistributedPlanner.createPlanFragments().
> We want to verify that both copies of the singleNodePlan (PlanNode) and
> planner context (PlannerContext) are identical to original ones in each
> iteration, e.g. don't make use of a data member in one iteration that has
> been modified in previous iterations.
> Replan implementation added new copy constructors for classes in PlanNode and
> StatementBase class hierarchy. In such copy constructors, there are both deep
> and shadow copied data members with the goal to minimally making deep copies
> to produce correct plans. We have to provide functions
> PlanNode.compareEqual() to compare tree of plan nodes, and
> PlannerContext.compareEqual() to compare two planner context objects.
>
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