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https://issues.apache.org/jira/browse/HIVE-3108?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14740553#comment-14740553
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Mikko Kivistö commented on HIVE-3108:
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I found the root cause: TBLPROPERTIES ('skip.header.line.count'='1') was
specified in the table and that causes the answer not to return.
> SELECT count(DISTINCT col) ... returns 0 if "col" is a partition column
> -----------------------------------------------------------------------
>
> Key: HIVE-3108
> URL: https://issues.apache.org/jira/browse/HIVE-3108
> Project: Hive
> Issue Type: Bug
> Components: Query Processor
> Affects Versions: 0.8.0, 0.9.0
> Environment: Mac OSX running Apache distribution of hadoop and hive
> natively.
> Reporter: Dean Wampler
> Labels: Hive
>
> Suppose "stocks" is a managed OR external table, partitioned by "exchange"
> and "symbol". "count(DISTINCT x)" returns 0 for either "exchange", "symbol",
> or both:
> hive> SELECT count(DISTINCT exchange), count(DISTINCT symbol) from stocks;
> 0 0
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