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https://issues.apache.org/jira/browse/HIVE-13089?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15155335#comment-15155335
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Gopal V commented on HIVE-13089:
--------------------------------
{code}
source/itests/qtest/../../ql/src/test/results/clientpositive/annotate_stats_deep_filters.q.out
124c124
< Statistics: Num rows: 300 Data size: 2392 Basic stats: COMPLETE
Column stats: COMPLETE
---
> Statistics: Num rows: 280 Data size: 2232 Basic stats: COMPLETE
> Column stats: COMPLETE
126c126
< Statistics: Num rows: 300 Data size: 2392 Basic stats:
COMPLETE Column stats: COMPLETE
---
> Statistics: Num rows: 280 Data size: 2232 Basic stats:
> COMPLETE Column stats: COMPLETE
{code}
in case we lose the logs by monday.
> Rounding in Stats for equality expressions
> ------------------------------------------
>
> Key: HIVE-13089
> URL: https://issues.apache.org/jira/browse/HIVE-13089
> Project: Hive
> Issue Type: Bug
> Components: Statistics
> Affects Versions: 2.1.0
> Reporter: Jesus Camacho Rodriguez
> Assignee: Jesus Camacho Rodriguez
> Attachments: HIVE-13089.patch
>
>
> Currently we divide numRows(long) by countDistinct(long), thus ignoring the
> decimals. We should do proper rounding.
> This is specially useful for equality expressions over columns whose values
> are unique. As NDV estimates allow for a certain error, if countDistinct >
> numRows, we end up with 0 rows in the estimate for the expression.
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