[jira] [Created] (CALCITE-6788) LoptOptimizeJoinRule should delegate costs to optimization planner

["Claude Brisson (Jira)" <ji...@apache.org>]

Claude Brisson created CALCITE-6788:
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             Summary: LoptOptimizeJoinRule should delegate costs to optimization planner
                 Key: CALCITE-6788
                 URL: https://issues.apache.org/jira/browse/CALCITE-6788
             Project: Calcite
          Issue Type: Improvement
          Components: core
    Affects Versions: 1.38.0
            Reporter: Claude Brisson


{{LoptOptimizeJoinRule}} uses costs comparisons to recursively decide whether to add a join at the top of the joins tree or to push it down.

When doing so, instead of directly calling {{mq.getCumulativeCost(rel)}}, it should rely on {{call.getPlanner.getCost(rel, mq)}}, which will be used thereafter to choose the best joins tree.

This way, it becomes possible to customize the costs computation during the heuristic joins ordering phase by just altering the {{getCost()}} method of the optimization planner.

Without this patch, it is only possible to alter joins costs at the final phase of the algorithm, which defeats the goal of customizing them, including during the to-top/push-down phase.




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