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From "Hive QA (JIRA)" <>
Subject [jira] [Commented] (HIVE-2327) Optimize REGEX UDFs with constant parameter information
Date Fri, 03 Apr 2015 21:55:54 GMT


Hive QA commented on HIVE-2327:

{color:red}Overall{color}: -1 at least one tests failed

Here are the results of testing the latest attachment:

{color:red}ERROR:{color} -1 due to 4 failed/errored test(s), 8704 tests executed
*Failed tests:*
TestMinimrCliDriver-smb_mapjoin_8.q - did not produce a TEST-*.xml file

Test results:
Console output:
Test logs:

Executing org.apache.hive.ptest.execution.PrepPhase
Executing org.apache.hive.ptest.execution.ExecutionPhase
Executing org.apache.hive.ptest.execution.ReportingPhase
Tests exited with: TestsFailedException: 4 tests failed

This message is automatically generated.

ATTACHMENT ID: 12709172 - PreCommit-HIVE-TRUNK-Build

> Optimize REGEX UDFs with constant parameter information
> -------------------------------------------------------
>                 Key: HIVE-2327
>                 URL:
>             Project: Hive
>          Issue Type: Improvement
>          Components: UDF
>            Reporter: Adam Kramer
>            Assignee: Alexander Pivovarov
>         Attachments: HIVE-2327.01.patch
> There are a lot of UDFs which would show major performance differences if one assumes
that some of its arguments are constant.
> Consider, for example, any UDF that takes a regular expression as input: This can be
complied once (fast) if it's a constant, or once per row (wicked slow) if it's not a constant.
> Or, consider any UDF that reads from a file and/or takes a filename as input; it would
have to re-read the whole file if the filename changes.

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