[jira] [Created] (CALCITE-1859) NPE in validate method of VolcanoPlanner

["Jesus Camacho Rodriguez (JIRA)" <ji...@apache.org>]

Jesus Camacho Rodriguez created CALCITE-1859:
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             Summary: NPE in validate method of VolcanoPlanner
                 Key: CALCITE-1859
                 URL: https://issues.apache.org/jira/browse/CALCITE-1859
             Project: Calcite
          Issue Type: Bug
          Components: core
    Affects Versions: 1.13.0
            Reporter: Jesus Camacho Rodriguez
            Assignee: Jesus Camacho Rodriguez
            Priority: Critical
             Fix For: 1.14.0


CALCITE-1812 introduced the following line in {{validate}} method in VolcanoPlanner:

https://github.com/apache/calcite/blob/master/core/src/main/java/org/apache/calcite/plan/volcano/VolcanoPlanner.java#L891
{code}
final RelMetadataQuery mq = root.getCluster().getMetadataQuery();
{code}

{{validate}} might be called as part of the {{setRoot}} logic before _root_ is set, thus we are hitting a NPE. Workaround was easy as {{validate}} is only called in logging DEBUG level (I guess that is why we did not see this issue before), but this JIRA will fix the issue by retrieving the RelMetadataQuery in _validate_ only when needed.



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