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https://issues.apache.org/jira/browse/CALCITE-3725?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17014034#comment-17014034
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Jin Xing commented on CALCITE-3725:
-----------------------------------
Hi, [~vladimirsitnikov]
I proposed a fix for this issue, please take a look when you have time ~
> RelMetadataTest fails with NPE due to unsafe RelMetadataQuery.instance call
> ---------------------------------------------------------------------------
>
> Key: CALCITE-3725
> URL: https://issues.apache.org/jira/browse/CALCITE-3725
> Project: Calcite
> Issue Type: Bug
> Components: core
> Affects Versions: 1.21.0
> Reporter: Vladimir Sitnikov
> Priority: Major
> Labels: pull-request-available
> Time Spent: 0.5h
> Remaining Estimate: 0h
>
> {noformat}
> org.apache.calcite.test.RelMetadataTest >
> testColumnUniquenessForMinusWithConstantColumns() FAILED
> java.lang.NullPointerException
> at java.util.Objects.requireNonNull(Objects.java:203)
> at
> org.apache.calcite.rel.metadata.RelMetadataQuery.<init>(RelMetadataQuery.java:141)
> at
> org.apache.calcite.rel.metadata.RelMetadataQuery.<init>(RelMetadataQuery.java:106)
> at
> org.apache.calcite.rel.metadata.RelMetadataQuery.instance(RelMetadataQuery.java:174)
> at
> org.apache.calcite.test.RelMetadataTest.testColumnUniquenessForMinusWithConstantColumns(RelMetadataTest.java:1057)
> {noformat}
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