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https://issues.apache.org/jira/browse/CALCITE-1147?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15191456#comment-15191456
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Julian Hyde commented on CALCITE-1147:
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[~maryannxue], I get other errors from Hbase (and the usual heaps of useless
trace output) but no NPE. Should I be initializing HBase in some way or should
it be sufficient to just run the test case method?
> Exceptions caused by CALCITE-604
> --------------------------------
>
> Key: CALCITE-1147
> URL: https://issues.apache.org/jira/browse/CALCITE-1147
> Project: Calcite
> Issue Type: Bug
> Reporter: Maryann Xue
> Assignee: Julian Hyde
> Fix For: 1.7.0
>
>
> The first exception I got while using PhoenixMetadataProvider was:
> "java.lang.IllegalArgumentException: duplicate key" in
> ChainedMetadataProvider.handlers(), which was caused by the use of
> ImmutableMap.Builder.
> According to
> https://groups.google.com/forum/#!topic/sakai-kernel/Kj1WRBg9pi8, in such
> scenarios, we should use HashMap instead.
> After fixing the above issue, I got NPE at
> ReflectiveRelMetadataProvider.java:278 {{if
> (RelNode.class.isAssignableFrom(relClass.getSuperclass())) {}}, for which I
> didn't know why it hadn't caused any trouble before. Since this logic wasn't
> really changed in CALCITE-604, I assume it went through the wrong code path.
> Looks like we should add more test cases for custom metadata in Calcite.
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