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https://issues.apache.org/jira/browse/HIVE-22079?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16934284#comment-16934284
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Hive QA commented on HIVE-22079:
--------------------------------
Here are the results of testing the latest attachment:
https://issues.apache.org/jira/secure/attachment/12980800/HIVE-22079.6.patch
{color:red}ERROR:{color} -1 due to no test(s) being added or modified.
{color:red}ERROR:{color} -1 due to 1 failed/errored test(s), 16833 tests
executed
*Failed tests:*
{noformat}
org.apache.hadoop.hive.cli.TestMiniLlapLocalCliDriver.testCliDriver[explainuser_1]
(batchId=171)
{noformat}
Test results:
https://builds.apache.org/job/PreCommit-HIVE-Build/18662/testReport
Console output: https://builds.apache.org/job/PreCommit-HIVE-Build/18662/console
Test logs: http://104.198.109.242/logs/PreCommit-HIVE-Build-18662/
Messages:
{noformat}
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
Tests exited with: TestsFailedException: 1 tests failed
{noformat}
This message is automatically generated.
ATTACHMENT ID: 12980800 - PreCommit-HIVE-Build
> 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
> 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
>
>
> 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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