hive-issues mailing list archives

Site index · List index
Message view « Date » · « Thread »
Top « Date » · « Thread »
From "Gunther Hagleitner (JIRA)" <j...@apache.org>
Subject [jira] [Assigned] (HIVE-12311) explain CTAS fails if the table already exists
Date Mon, 02 Nov 2015 22:28:27 GMT

     [ https://issues.apache.org/jira/browse/HIVE-12311?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Gunther Hagleitner reassigned HIVE-12311:
-----------------------------------------

    Assignee: Gunther Hagleitner

> 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
>
> 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.



--
This message was sent by Atlassian JIRA
(v6.3.4#6332)

Mime
View raw message