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https://issues.apache.org/jira/browse/HIVE-22239?focusedWorklogId=325667&page=com.atlassian.jira.plugin.system.issuetabpanels:worklog-tabpanel#worklog-325667
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ASF GitHub Bot logged work on HIVE-22239:
-----------------------------------------
Author: ASF GitHub Bot
Created on: 09/Oct/19 12:45
Start Date: 09/Oct/19 12:45
Worklog Time Spent: 10m
Work Description: jcamachor commented on pull request #787: HIVE-22239
URL: https://github.com/apache/hive/pull/787#discussion_r332991505
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File path:
standalone-metastore/metastore-common/src/main/thrift/hive_metastore.thrift
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@@ -562,14 +562,27 @@ struct DateColumnStatsData {
5: optional binary bitVectors
}
+struct Timestamp {
+1: required i64 secondsSinceEpoch
Review comment:
I do not think it is too complicated but it will imply changes in the
metastore tables that store these values too. I did not want to change the
internal representation of column stats for timestamp type in this patch, that
is why I introduced the type but did not change the internal representation
based on seconds. I created https://issues.apache.org/jira/browse/HIVE-22309.
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Issue Time Tracking
-------------------
Worklog Id: (was: 325667)
Time Spent: 3.5h (was: 3h 20m)
> Scale data size using column value ranges
> -----------------------------------------
>
> Key: HIVE-22239
> URL: https://issues.apache.org/jira/browse/HIVE-22239
> Project: Hive
> Issue Type: Improvement
> Components: Physical Optimizer
> Reporter: Jesus Camacho Rodriguez
> Assignee: Jesus Camacho Rodriguez
> Priority: Major
> Labels: pull-request-available
> Attachments: HIVE-22239.01.patch, HIVE-22239.02.patch,
> HIVE-22239.patch
>
> Time Spent: 3.5h
> Remaining Estimate: 0h
>
> Currently, min/max values for columns are only used to determine whether a
> certain range filter falls out of range and thus filters all rows or none at
> all. If it does not, we just use a heuristic that the condition will filter
> 1/3 of the input rows. Instead of using that heuristic, we can use another
> one that assumes that data will be uniformly distributed across that range,
> and calculate the selectivity for the condition accordingly.
> This patch also includes the propagation of min/max column values from
> statistics to the optimizer for timestamp type.
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