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From "ASF GitHub Bot (Jira)" <>
Subject [jira] [Work logged] (HIVE-22079) Post order walker for iterating over expression tree
Date Tue, 01 Oct 2019 02:32:00 GMT


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
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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:
>             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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