[CALCITE-3503] NPE at VolcanoPlanner#isValid when DEBUG is enabled

• Type: Bug
• Status: Closed
• Priority: Blocker
• Resolution: Fixed
• Affects Version/s: 1.21.0
• Fix Version/s: 1.22.0
• Component/s: core
• Labels: pull-request-available
• Assignee: Unassigned
• Reporter: Stamatis Zampetakis
• Created: 14/Nov/19 07:02
• Updated: 06/Mar/20 04:34
• Resolved: 14/Nov/19 18:02

Description

The stacktrace is the following:

 java.lang.NullPointerException
            at org.apache.calcite.plan.volcano.VolcanoPlanner.isValid(VolcanoPlanner.java:880)
            at org.apache.calcite.plan.volcano.VolcanoPlanner.ensureRegistered(VolcanoPlanner.java:870)
            at org.apache.calcite.plan.volcano.VolcanoPlanner.ensureRegistered(VolcanoPlanner.java:92)
            at org.apache.calcite.rel.AbstractRelNode.onRegister(AbstractRelNode.java:321)
            at org.apache.calcite.plan.volcano.VolcanoPlanner.registerImpl(VolcanoPlanner.java:1701)
            at org.apache.calcite.plan.volcano.VolcanoPlanner.setRoot(VolcanoPlanner.java:298)
            at org.apache.calcite.tools.Programs.lambda$standard$3(Programs.java:269)

According to volodymyr this is a regression caused by CALCITE-3487.

Issue Links

• is caused by: CALCITE-3487 Should not hard code RelMetadataQuery class in VolcanoPlanner.isValid()
• links to: GitHub Pull Request #1584
• links to: GitHub Pull Request #1597