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From "Hive QA (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HIVE-21388) Constant UDF is not pushed to JDBCStorage Handler
Date Wed, 06 Mar 2019 02:48:01 GMT

    [ https://issues.apache.org/jira/browse/HIVE-21388?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16785174#comment-16785174
] 

Hive QA commented on HIVE-21388:
--------------------------------



Here are the results of testing the latest attachment:
https://issues.apache.org/jira/secure/attachment/12961187/HIVE-21388.01.patch

{color:green}SUCCESS:{color} +1 due to 1 test(s) being added or modified.

{color:red}ERROR:{color} -1 due to 1 failed/errored test(s), 15817 tests executed
*Failed tests:*
{noformat}
org.apache.hadoop.hive.cli.TestCliDriver.testCliDriver[vector_groupby_reduce] (batchId=61)
{noformat}

Test results: https://builds.apache.org/job/PreCommit-HIVE-Build/16352/testReport
Console output: https://builds.apache.org/job/PreCommit-HIVE-Build/16352/console
Test logs: http://104.198.109.242/logs/PreCommit-HIVE-Build-16352/

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: 12961187 - PreCommit-HIVE-Build

> Constant UDF is not pushed to JDBCStorage Handler
> -------------------------------------------------
>
>                 Key: HIVE-21388
>                 URL: https://issues.apache.org/jira/browse/HIVE-21388
>             Project: Hive
>          Issue Type: Improvement
>          Components: CBO, StorageHandler
>    Affects Versions: 4.0.0
>            Reporter: Daniel Dai
>            Assignee: Jesus Camacho Rodriguez
>            Priority: Major
>         Attachments: HIVE-21388.01.patch, HIVE-21388.patch
>
>
> A query involve a Hive UDF which produce a constant value does not push to JDBC table.
Replacing the UDF with a constant push down works. Ideally, Hive shall first do constant folding
and then push the computation.
> Here is the example:
> {code}
> explain select PRINCIPAL_NAME from sys.TBL_PRIVS where PRINCIPAL_NAME=current_user();
> +----------------------------------------------------+
> |                      Explain                       |
> +----------------------------------------------------+
> | Plan optimized by CBO.                             |
> |                                                    |
> | Stage-0                                            |
> |   Fetch Operator                                   |
> |     limit:-1                                       |
> |     Select Operator [SEL_3]                        |
> |       Output:["_col0"]                             |
> |       Filter Operator [FIL_2]                      |
> |         predicate:(_col5 = 'hrt_qa')               |
> |         Select Operator [SEL_1]                    |
> |           Output:["_col5"]                         |
> |           TableScan [TS_0]                         |
> |             Output:["principal_name"],properties:{"hive.sql.query":"SELECT `tbl_grant_id`,
`create_time`, `grant_option`, `grantor`, `grantor_type`, `principal_name`, `principal_type`,
`tbl_priv`, `tbl_id`, `authorizer`\nFROM `TBL_PRIVS`","hive.sql.query.fieldNames":"tbl_grant_id,create_time,grant_option,grantor,grantor_type,principal_name,principal_type,tbl_priv,tbl_id,authorizer","hive.sql.query.fieldTypes":"bigint,int,int,string,string,string,string,string,bigint,string","hive.sql.query.split":"true"}
|
> |                                                    |
> +----------------------------------------------------+
> {code}
> If I replace current_user() with a constant, the predicate is pushed to table scan.
> Also, setting annotation deterministic=true and make initialize() return a ConstantObjectInspector
of GenericUDFCurrentUser does not make a difference.



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