[jira] [Created] (CALCITE-3676) VolcanoPlanner. dumpGraphviz should handle exception gracefully

["Haisheng Yuan (Jira)" <ji...@apache.org>]

Haisheng Yuan created CALCITE-3676:
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             Summary: VolcanoPlanner. dumpGraphviz should handle exception gracefully
                 Key: CALCITE-3676
                 URL: https://issues.apache.org/jira/browse/CALCITE-3676
             Project: Calcite
          Issue Type: Bug
          Components: core
            Reporter: Haisheng Yuan


In case VolcanoPlanner can't generate plan due to some RelSubset doesn't have best rel, it will dump the sets and Graphviz. Since there is error during planning, we want to see the sets in the exception message, but when dumping Graphviz, it might encounter another exception (we can't guarantee all the sets and subsets are correctly generated for Graphviz), causing failure to dump Sets info, which is rather helpful in production system.


{code:java}
Caused by: java.lang.AssertionError
	at org.apache.calcite.util.PartiallyOrderedSet.findParentsChildren(PartiallyOrderedSet.java:318)
	at org.apache.calcite.util.PartiallyOrderedSet.findParents(PartiallyOrderedSet.java:308)
	at org.apache.calcite.util.PartiallyOrderedSet.add(PartiallyOrderedSet.java:226)
	at org.apache.calcite.plan.volcano.VolcanoPlanner.dumpGraphviz(VolcanoPlanner.java:1320)
	at org.apache.calcite.plan.volcano.VolcanoPlanner.dump(VolcanoPlanner.java:1194)
	at org.apache.calcite.plan.volcano.RelSubset$CheapestPlanReplacer.visit(RelSubset.java:606)
	at org.apache.calcite.plan.volcano.RelSubset.buildCheapestPlan(RelSubset.java:307)
	at org.apache.calcite.plan.volcano.VolcanoPlanner.findBestExp(VolcanoPlanner.java:649)
{code}




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