Ted Xu created CALCITE-1883:
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Summary: HepPlanner should force garbage collect whenever a root
registered
Key: CALCITE-1883
URL: https://issues.apache.org/jira/browse/CALCITE-1883
Project: Calcite
Issue Type: Bug
Reporter: Ted Xu
Assignee: Julian Hyde
Currently HepPlanner#collectGarbage() will skip if there is no new transform
since last GC. If HepPlanner is reused, it is common case that no transform is
applied after last cheapest plan is built while before next round of optimize
is kicked off.
This may break HepPlanner because the garbage is probably not a graph after
HepPlanner#buildFinalPlan .
I'll try if I can create a reproduce case.
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