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https://issues.apache.org/jira/browse/HIVE-5602?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13801368#comment-13801368
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Edward Capriolo commented on HIVE-5602:
---------------------------------------
SELECT operator is doing try catch inside a for loop each column when it does
not need to. Additionally we are making a function call each row to check
conf.isSelectComputeNoStart()
I micro-benched before and after the change and showed a minimal bonus, please
review.
{pre}
13/10/21 20:29:29 INFO exec.FilterOperator: 0 forwarding 1 rows
13/10/21 20:29:29 INFO exec.FilterOperator: 0 forwarding 10 rows
13/10/21 20:29:29 INFO exec.FilterOperator: 0 forwarding 100 rows
13/10/21 20:29:29 INFO exec.FilterOperator: 0 forwarding 1000 rows
13/10/21 20:29:29 INFO exec.FilterOperator: 0 forwarding 10000 rows
13/10/21 20:29:30 INFO exec.FilterOperator: 0 forwarding 100000 rows
13/10/21 20:29:31 INFO exec.FilterOperator: 0 forwarding 1000000 rows
13/10/21 20:29:33 INFO exec.FilterOperator: 0 forwarding 2000000 rows
13/10/21 20:29:34 INFO exec.FilterOperator: 0 forwarding 3000000 rows
13/10/21 20:29:36 INFO exec.FilterOperator: 0 forwarding 4000000 rows
13/10/21 20:29:38 INFO exec.FilterOperator: 0 forwarding 5000000 rows
13/10/21 20:29:40 INFO exec.FilterOperator: 0 forwarding 6000000 rows
13/10/21 20:29:41 INFO exec.FilterOperator: 0 forwarding 7000000 rows
13/10/21 20:29:43 INFO exec.FilterOperator: 0 forwarding 8000000 rows
13/10/21 20:29:45 INFO exec.FilterOperator: 0 forwarding 9000000 rows
13/10/21 20:29:46 INFO exec.FilterOperator: 0 forwarding 10000000 rows
13/10/21 20:31:36 INFO exec.FilterOperator: Initialization Done 0 FIL
13/10/21 20:31:36 INFO exec.FilterOperator: 0 forwarding 1 rows
13/10/21 20:31:36 INFO exec.FilterOperator: 0 forwarding 10 rows
13/10/21 20:31:36 INFO exec.FilterOperator: 0 forwarding 100 rows
13/10/21 20:31:36 INFO exec.FilterOperator: 0 forwarding 1000 rows
13/10/21 20:31:37 INFO exec.FilterOperator: 0 forwarding 10000 rows
13/10/21 20:31:37 INFO exec.FilterOperator: 0 forwarding 100000 rows
13/10/21 20:31:38 INFO exec.FilterOperator: 0 forwarding 1000000 rows
13/10/21 20:31:40 INFO exec.FilterOperator: 0 forwarding 2000000 rows
13/10/21 20:31:41 INFO exec.FilterOperator: 0 forwarding 3000000 rows
13/10/21 20:31:43 INFO exec.FilterOperator: 0 forwarding 4000000 rows
13/10/21 20:31:45 INFO exec.FilterOperator: 0 forwarding 5000000 rows
13/10/21 20:31:46 INFO exec.FilterOperator: 0 forwarding 6000000 rows
13/10/21 20:31:48 INFO exec.FilterOperator: 0 forwarding 7000000 rows
13/10/21 20:31:49 INFO exec.FilterOperator: 0 forwarding 8000000 rows
13/10/21 20:31:51 INFO exec.FilterOperator: 0 forwarding 9000000 rows
13/10/21 20:31:53 INFO exec.FilterOperator: 0 forwarding 10000000 rows
{pre}
> Micro optimize select operator
> ------------------------------
>
> Key: HIVE-5602
> URL: https://issues.apache.org/jira/browse/HIVE-5602
> Project: Hive
> Issue Type: Improvement
> Reporter: Edward Capriolo
> Assignee: Edward Capriolo
> Priority: Minor
> Attachments: HIVE-5602.patch.1.txt
>
>
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