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From "Jimmy Xiang (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HIVE-12506) SHOW CREATE TABLE command creates a table that does not work for RCFile format
Date Wed, 02 Dec 2015 00:18:11 GMT

    [ https://issues.apache.org/jira/browse/HIVE-12506?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15034942#comment-15034942
] 

Jimmy Xiang commented on HIVE-12506:
------------------------------------

+1

> SHOW CREATE TABLE command creates a table that does not work for RCFile format
> ------------------------------------------------------------------------------
>
>                 Key: HIVE-12506
>                 URL: https://issues.apache.org/jira/browse/HIVE-12506
>             Project: Hive
>          Issue Type: Bug
>          Components: Serializers/Deserializers
>    Affects Versions: 1.1.1
>            Reporter: Eric Lin
>            Assignee: Chaoyu Tang
>         Attachments: HIVE-12506.patch, HIVE-12506.patch
>
>
> See the following test case:
> 1) Create a table with RCFile format:
> {code}
> DROP TABLE IF EXISTS test;
> CREATE TABLE test (a int) PARTITIONED BY (p int)
> ROW FORMAT DELIMITED FIELDS TERMINATED BY '|' 
> STORED AS RCFILE;
> {code}
> 2) run "DESC FORMATTED test"
> {code}
> # Storage Information
> SerDe Library:      	org.apache.hadoop.hive.serde2.columnar.ColumnarSerDe
> InputFormat:        	org.apache.hadoop.hive.ql.io.RCFileInputFormat
> OutputFormat:       	org.apache.hadoop.hive.ql.io.RCFileOutputFormat
> {code}
> shows that SerDe used is "ColumnarSerDe"
> 3) run "SHOW CREATE TABLE" and get the output:
> {code}
> CREATE TABLE `test`(
>   `a` int)
> PARTITIONED BY (
>   `p` int)
> ROW FORMAT DELIMITED
>   FIELDS TERMINATED BY '|'
> STORED AS INPUTFORMAT
>   'org.apache.hadoop.hive.ql.io.RCFileInputFormat'
> OUTPUTFORMAT
>   'org.apache.hadoop.hive.ql.io.RCFileOutputFormat'
> LOCATION
>   'hdfs://node5.lab.cloudera.com:8020/user/hive/warehouse/case_78732.db/test'
> TBLPROPERTIES (
>   'transient_lastDdlTime'='1448343875')
> {code}
> Note that there is no mention of "ColumnarSerDe"
> 4) Drop the table and then create the table again using the output from 3)
> 5) Check the output of "DESC FORMATTED test"
> {code}
> # Storage Information
> SerDe Library:      	org.apache.hadoop.hive.serde2.lazy.LazySimpleSerDe
> InputFormat:        	org.apache.hadoop.hive.ql.io.RCFileInputFormat
> OutputFormat:       	org.apache.hadoop.hive.ql.io.RCFileOutputFormat
> {code}
> The SerDe falls back to "LazySimpleSerDe", which is not correct.
> Any further query tries to INSERT or SELECT this table will fail with errors
> I suspect that we can't specify ROW FORMAT DELIMITED with ROW FORMAT SERDE at the same
time at table creation, this causes confusion to end users as copy table structure using "SHOW
CREATE TABLE" will not work.



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