[jira] [Commented] (HIVE-12311) explain CTAS fails if the table already exists

["Hive QA (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/HIVE-12311?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14986735#comment-14986735 ] 

Hive QA commented on HIVE-12311:
--------------------------------



Here are the results of testing the latest attachment:
https://issues.apache.org/jira/secure/attachment/12770176/HIVE-12311.1.patch

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

{color:red}ERROR:{color} -1 due to 4 failed/errored test(s), 9761 tests executed
*Failed tests:*
{noformat}
org.apache.hadoop.hive.cli.TestHBaseCliDriver.testCliDriver_hbase_queries
org.apache.hadoop.hive.cli.TestNegativeCliDriver.testNegativeCliDriver_authorization_uri_import
org.apache.hadoop.hive.hwi.TestHWISessionManager.testHiveDriver
org.apache.hive.jdbc.TestSSL.testSSLVersion
{noformat}

Test results: http://ec2-174-129-184-35.compute-1.amazonaws.com/jenkins/job/PreCommit-HIVE-TRUNK-Build/5896/testReport
Console output: http://ec2-174-129-184-35.compute-1.amazonaws.com/jenkins/job/PreCommit-HIVE-TRUNK-Build/5896/console
Test logs: http://ec2-174-129-184-35.compute-1.amazonaws.com/logs/PreCommit-HIVE-TRUNK-Build-5896/

Messages:
{noformat}
Executing org.apache.hive.ptest.execution.TestCheckPhase
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
{noformat}

This message is automatically generated.

ATTACHMENT ID: 12770176 - PreCommit-HIVE-TRUNK-Build

> explain CTAS fails if the table already exists
> ----------------------------------------------
>
>                 Key: HIVE-12311
>                 URL: https://issues.apache.org/jira/browse/HIVE-12311
>             Project: Hive
>          Issue Type: Bug
>          Components: Hive
>    Affects Versions: 1.2.1
>            Reporter: Carter Shanklin
>            Assignee: Gunther Hagleitner
>            Priority: Minor
>         Attachments: HIVE-12311.1.patch
>
>
> Explain of a CTAS will fail if the table already exists.
> This is an annoyance when you're seeing if a large body of SQL queries will function by putting explain in front of every query. 
> {code}
> hive> create table temp (x int);
> OK
> Time taken: 0.252 seconds
> hive> create table temp2 (x int);
> OK
> Time taken: 0.407 seconds
> hive> explain create table temp as select * from temp2;
> FAILED: SemanticException org.apache.hadoop.hive.ql.parse.SemanticException: Table already exists: mydb.temp
> {code}
> If we compare to Postgres "The Zinc Standard of SQL Compliance":
> {code}
> carter=# create table temp (x int);
> CREATE TABLE
> carter=# create table temp2 (x int);
> CREATE TABLE
> carter=# explain create table temp as select * from temp2;
>                        QUERY PLAN
> ---------------------------------------------------------
>  Seq Scan on temp2  (cost=0.00..34.00 rows=2400 width=4)
> (1 row)
> {code}
> If the CTAS is something complex it would be nice to see the query plan in advance.



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