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From "Hive QA (Jira)" <>
Subject [jira] [Commented] (HIVE-22079) Post order walker for iterating over expression tree
Date Thu, 26 Sep 2019 04:05:00 GMT


Hive QA commented on HIVE-22079:

Here are the results of testing the latest attachment:

{color:red}ERROR:{color} -1 due to no test(s) being added or modified.

{color:green}SUCCESS:{color} +1 due to 17007 tests passed

Test results:
Console output:
Test logs:

Executing org.apache.hive.ptest.execution.TestCheckPhase
Executing org.apache.hive.ptest.execution.PrepPhase
Executing org.apache.hive.ptest.execution.YetusPhase
Executing org.apache.hive.ptest.execution.ExecutionPhase
Executing org.apache.hive.ptest.execution.ReportingPhase

This message is automatically generated.

ATTACHMENT ID: 12981359 - PreCommit-HIVE-Build

> 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
>         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
>  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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