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Posted to issues@calcite.apache.org by "Botong Huang (Jira)" <ji...@apache.org> on 2020/04/27 03:46:00 UTC

[jira] [Created] (CALCITE-3961) VolcanoPlanner.prunedNodes information is lost when duplicate relNode is discarded

Botong Huang created CALCITE-3961:
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             Summary: VolcanoPlanner.prunedNodes information is lost when duplicate relNode is discarded
                 Key: CALCITE-3961
                 URL: https://issues.apache.org/jira/browse/CALCITE-3961
             Project: Calcite
          Issue Type: Bug
            Reporter: Botong Huang


VolcanoPlanner.prunedNodes stores the list of relNodes that are marked useless. Whenever the planner see two identical relNode (e.g. when Relsets are merged), one of them are discarded. However, when the preserved node is not in the pruned list while the discarded one is, this pruned information is lost. In general, we should preserve this info whenever duplicate relNodes are discarded. 



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