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From "Hive QA (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HIVE-17040) Join elimination in the presence of FK relationship
Date Sun, 12 Aug 2018 19:39:00 GMT

    [ https://issues.apache.org/jira/browse/HIVE-17040?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16577701#comment-16577701
] 

Hive QA commented on HIVE-17040:
--------------------------------



Here are the results of testing the latest attachment:
https://issues.apache.org/jira/secure/attachment/12935296/HIVE-17040.02.patch

{color:green}SUCCESS:{color} +1 due to 10 test(s) being added or modified.

{color:red}ERROR:{color} -1 due to 1 failed/errored test(s), 14880 tests executed
*Failed tests:*
{noformat}
org.apache.hadoop.hive.cli.TestSparkCliDriver.testCliDriver[list_bucket_dml_2] (batchId=114)
{noformat}

Test results: https://builds.apache.org/job/PreCommit-HIVE-Build/13183/testReport
Console output: https://builds.apache.org/job/PreCommit-HIVE-Build/13183/console
Test logs: http://104.198.109.242/logs/PreCommit-HIVE-Build-13183/

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: 12935296 - PreCommit-HIVE-Build

> Join elimination in the presence of FK relationship
> ---------------------------------------------------
>
>                 Key: HIVE-17040
>                 URL: https://issues.apache.org/jira/browse/HIVE-17040
>             Project: Hive
>          Issue Type: Sub-task
>          Components: Logical Optimizer
>    Affects Versions: 3.0.0
>            Reporter: Jesus Camacho Rodriguez
>            Assignee: Jesus Camacho Rodriguez
>            Priority: Major
>         Attachments: HIVE-17040.01.patch, HIVE-17040.02.patch, HIVE-17040.patch
>
>
> If the PK/UK table is not filtered, we can safely remove the join.
> A simple example:
> {code:sql}
> SELECT c_current_cdemo_sk
> FROM customer, customer_address
> ON c_current_addr_sk = ca_address_sk;
> {code}
> As a Calcite rule, we could implement this rewriting by 1) matching a Project on top
of a Join operator, 2) checking that only columns from the FK are used in the Project, 3)
checking that the join condition matches the FK - PK/UK relationship, 4) pulling all the predicates
from the PK/UK side and checking that the input is not filtered, and 5) removing the join,
possibly adding a IS NOT NULL condition on the join column from the FK side.
> If the PK/UK table is filtered, we should still transform the Join into a SemiJoin operator.



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