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From amansinha100 <...@git.apache.org>
Subject [GitHub] drill issue #671: DRILL-4347: Propagate distinct row count for joins from lo...
Date Tue, 29 Nov 2016 21:04:26 GMT
Github user amansinha100 commented on the issue:

    It is quite likely that the CachingRelMetadataProvider is meant for this.  Based on the
stack trace, there are multiple instances of "at org.apache.calcite.rel.metadata.CachingRelMetadataProvider$CachingInvocationHandler.invoke(CachingRelMetadataProvider.java:132)"
 and that line # indicates that there was either a cache miss or the entry was stale.   So,
the caching provider does in fact get used but then subsequently gets stuck in the apply()
method of the ReflectiveRelMetadataProvider.  I did not attempt to debug why it got stuck
there...partly because I am not very familiar with the way reflection is used in this provider.
 Hence, my fix is an attempt to circumvent the issue.  

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