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https://issues.apache.org/jira/browse/CALCITE-509?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Julian Hyde closed CALCITE-509.
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Closing now that 1.0.0-incubating has been released.
> RelMdColumnUniqueness uses ImmutableBitSet.Builder twice, gets
> NullPointerException
> -----------------------------------------------------------------------------------
>
> Key: CALCITE-509
> URL: https://issues.apache.org/jira/browse/CALCITE-509
> Project: Calcite
> Issue Type: Bug
> Reporter: Julian Hyde
> Assignee: Julian Hyde
> Labels: newbie
> Fix For: 1.0.0-incubating
>
>
> RelMdColumnUniqueness.areColumnsUnique gets the following stack:
> {code}
> ava.lang.NullPointerException
> at
> org.apache.calcite.util.ImmutableBitSet.countBits(ImmutableBitSet.java:280)
> at
> org.apache.calcite.util.ImmutableBitSet.access$600(ImmutableBitSet.java:36)
> at
> org.apache.calcite.util.ImmutableBitSet$Builder.cardinality(ImmutableBitSet.java:799)
> at
> org.apache.calcite.rel.metadata.RelMdColumnUniqueness.areColumnsUnique(RelMdColumnUniqueness.java:178)
> {code}
> The cause is that it populates an ImmutableBitSet.Builder, calls build on it,
> then calls cardinality. That is not allowed -- once build has been called the
> builder cannot be re-used, even for cardinality.
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