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https://issues.apache.org/jira/browse/HIVE-7060?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Xuefu Zhang updated HIVE-7060:
------------------------------
Description:
It seems that the result from column statistics isn't correct on two measures
for numeric columns: min (which is always 0) and distinct count. Here is an
example:
{code}
select count(distinct avgTimeOnSite), min(avgTimeOnSite) from
UserVisits_web_text_none;
...
OK
9 1
Time taken: 9.747 seconds, Fetched: 1 row(s)
{code}
The statisitics for the column:
{code}
desc formatted UserVisits_web_text_none avgTimeOnSite
...
# col_name data_type min max
num_nulls distinct_count avg_col_len
max_col_len num_trues num_falses
comment
avgTimeOnSite int 0 9
0 11 null
null null
{code}
was:
It seems that the result from column statistics isn't correct on two measures
for numeric columns: min (which is always 0) and distinct count. Here is an
example:
{code}
select count(distinct avgTimeOnSite), min(avgTimeOnSite) from
UserVisits_web_text_none;
...
OK
9 1
Time taken: 9.747 seconds, Fetched: 1 row(s)
{code}
The statisitics for the column:
{code}
PREHOOK: query: desc formatted UserVisits_web_text_none avgTimeOnSite
PREHOOK: type: DESCTABLE
PREHOOK: Input: default@uservisits_web_text_none
POSTHOOK: query: desc formatted UserVisits_web_text_none avgTimeOnSite
POSTHOOK: type: DESCTABLE
POSTHOOK: Input: default@uservisits_web_text_none
# col_name data_type min max
num_nulls distinct_count avg_col_len
max_col_len num_trues num_falses
comment
avgTimeOnSite int 0 9
0 11 null
null null
{code}
> Column stats give incorrect min and distinct_count
> --------------------------------------------------
>
> Key: HIVE-7060
> URL: https://issues.apache.org/jira/browse/HIVE-7060
> Project: Hive
> Issue Type: Bug
> Components: Statistics
> Affects Versions: 0.13.0
> Reporter: Xuefu Zhang
>
> It seems that the result from column statistics isn't correct on two measures
> for numeric columns: min (which is always 0) and distinct count. Here is an
> example:
> {code}
> select count(distinct avgTimeOnSite), min(avgTimeOnSite) from
> UserVisits_web_text_none;
> ...
> OK
> 9 1
> Time taken: 9.747 seconds, Fetched: 1 row(s)
> {code}
> The statisitics for the column:
> {code}
> desc formatted UserVisits_web_text_none avgTimeOnSite
> ...
> # col_name data_type min max
> num_nulls distinct_count avg_col_len
> max_col_len num_trues num_falses
> comment
> avgTimeOnSite int 0 9
> 0 11 null
> null null
> {code}
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