Jinfeng Ni created CALCITE-628:
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Summary: Calcite hit Assertion Error when calling
Frameworks.planner or RelOptRule.convert(), if the target trait is composite
Key: CALCITE-628
URL: https://issues.apache.org/jira/browse/CALCITE-628
Project: Calcite
Issue Type: Bug
Reporter: Jinfeng Ni
Assignee: Julian Hyde
CALCITE-88 introduces the concept of RelCompositeTrait. As such, Calcite seems
to require that each new RelSubSet should only have simple trait, in stead of
composite traits. If that condition is not meet, an assertion will be thrown.
However, when we use Frameworks.planner to call transform(), or use RelOptRule
to call convert() method, there is no guarantee that the target traits are
simple. If the target traits happened to be composite, then Calcite will hit
Assertion at RelSubset.java:108.
There seems to be two options to fix this Assertion and ensure RelSubset only
have simple traitsets :
1) Follow the way Prepare.optimize(), and call simplify() for the target
traitset, in both PlannerImpl.transform() or RelOptRule.convert().
2) Each callers of transform(), or convert() method should make sure the target
traits are simple.
The patch I'm going to submit uses the 1st option, using the same logic in
Prepare.optimize().
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