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https://issues.apache.org/jira/browse/HIVE-22893?focusedWorklogId=393330&page=com.atlassian.jira.plugin.system.issuetabpanels:worklog-tabpanel#worklog-393330
]
ASF GitHub Bot logged work on HIVE-22893:
-----------------------------------------
Author: ASF GitHub Bot
Created on: 26/Feb/20 10:11
Start Date: 26/Feb/20 10:11
Worklog Time Spent: 10m
Work Description: kgyrtkirk commented on pull request #915: HIVE-22893
StatEstimate
URL: https://github.com/apache/hive/pull/915#discussion_r384360809
##########
File path:
ql/src/java/org/apache/hadoop/hive/ql/stats/estimator/StatEstimators.java
##########
@@ -0,0 +1,51 @@
+package org.apache.hadoop.hive.ql.stats.estimator;
+
+import java.util.Optional;
+
+import org.apache.hadoop.hive.ql.plan.ColStatistics;
+
+public class StatEstimators {
Review comment:
I was thinking that there will be multiple methods/tools needed to implement
estimators - however I ended up having only one common thing.
Right now I don't foresee that it will be beneficial to retain this
container class; so I moved the innerclass outside and removed the
StatEstimators class.
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Issue Time Tracking
-------------------
Worklog Id: (was: 393330)
Time Spent: 1h 20m (was: 1h 10m)
> Enhance data size estimation for fields computed by UDFs
> --------------------------------------------------------
>
> Key: HIVE-22893
> URL: https://issues.apache.org/jira/browse/HIVE-22893
> Project: Hive
> Issue Type: Improvement
> Components: Statistics
> Reporter: Zoltan Haindrich
> Assignee: Zoltan Haindrich
> Priority: Major
> Labels: pull-request-available
> Attachments: HIVE-22893.01.patch, HIVE-22893.02.patch,
> HIVE-22893.03.patch, HIVE-22893.04.patch, HIVE-22893.05.patch,
> HIVE-22893.06.patch, HIVE-22893.07.patch, HIVE-22893.08.patch,
> HIVE-22893.09.patch, HIVE-22893.10.patch, HIVE-22893.11.patch,
> HIVE-22893.12.patch, HIVE-22893.13.patch
>
> Time Spent: 1h 20m
> Remaining Estimate: 0h
>
> Right now if we have columnstat on a column ; we use that to estimate things
> about the column; - however if an UDF is executed on a column ; the resulting
> column is treated as unknown thing and defaults are assumed.
> An improvement could be to give wide estimation(s) in case of frequently used
> udf.
> For example; consider {{substr(c,1,1)}} ; no matter what the input; the
> output is at most a 1 long string
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