Support accumulator initializer expression in HashAgg

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    • Type: Task
    • Resolution: Won't Fix
    • Priority: Major - P3
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    • Affects Version/s: None
    • Component/s: Query Execution
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    • Query Execution
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    • 3
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      Each accumulator has an initializer expression that can be used to initialize an accumulator in certain scenarios. One example of this is when DSGroup creates a fresh group, and another is when DSGroup reads spilled accumulator states from disk and re-initializes groups.

      We need a mechanism to initialize agg expressions in sbe. This could be done by augmenting HashAgg to evaluate an initializer expression.

      We can think of other ways as well.

            Assignee:
            [DO NOT USE] Backlog - Query Execution
            Reporter:
            Eric Cox (Inactive)
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