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Posted to issues@hive.apache.org by "ASF GitHub Bot (Jira)" <ji...@apache.org> on 2019/10/01 02:32:00 UTC
[jira] [Work logged] (HIVE-22079) Post order walker for iterating
over expression tree
[ https://issues.apache.org/jira/browse/HIVE-22079?focusedWorklogId=321029&page=com.atlassian.jira.plugin.system.issuetabpanels:worklog-tabpanel#worklog-321029 ]
ASF GitHub Bot logged work on HIVE-22079:
-----------------------------------------
Author: ASF GitHub Bot
Created on: 01/Oct/19 02:31
Start Date: 01/Oct/19 02:31
Worklog Time Spent: 10m
Work Description: vineetgarg02 commented on pull request #780: HIVE-22079: Post order walker for iterating over expression tree
URL: https://github.com/apache/hive/pull/780
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Issue Time Tracking
-------------------
Worklog Id: (was: 321029)
Time Spent: 1h 10m (was: 1h)
> Post order walker for iterating over expression tree
> ----------------------------------------------------
>
> Key: HIVE-22079
> URL: https://issues.apache.org/jira/browse/HIVE-22079
> Project: Hive
> Issue Type: Improvement
> Components: Logical Optimizer, Physical Optimizer
> Affects Versions: 4.0.0
> Reporter: Vineet Garg
> Assignee: Vineet Garg
> Priority: Major
> Labels: pull-request-available
> Fix For: 4.0.0
>
> Attachments: HIVE-22079.1.patch, HIVE-22079.2.patch, HIVE-22079.3.patch, HIVE-22079.4.patch, HIVE-22079.5.patch, HIVE-22079.6.patch, HIVE-22079.7.patch, HIVE-22079.8.patch, HIVE-22079.9.patch
>
> Time Spent: 1h 10m
> Remaining Estimate: 0h
>
> Current {{DefaultGraphWalker}} is used to iterate over an expression tree. This walker uses hash map to keep track of visited/processed nodes. If an expression tree is large this adds significant overhead due to map lookup.
> For an expression trees we can instead use post order traversal and avoid using map.
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