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Iterative optimizer #6956

Merged
merged 2 commits into from Jan 7, 2017
Merged

Iterative optimizer #6956

merged 2 commits into from Jan 7, 2017

Commits on Dec 23, 2016

  1. Move replaceChild logic to per-node method 

    This makes it easier to extend the node hierarchy for tests in the
upcoming iterative optimizer.
    @martint
    martint committed Dec 23, 2016
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Commits on Dec 28, 2016

  1. Iterative optimizer 

    This optimizer decouples the traversal of the plan tree (IterativeOptimizer)
from the transformation logic (Rule). The optimization loop applies rules
recursively until a fixpoint is reached.

It's implemented as PlanOptimizer so that it fits right into the existing
framework.
    @martint
    martint committed Dec 28, 2016
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