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From "Hari Sankar Sivarama Subramaniyan (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HIVE-13708) Create table should verify datatypes supported by the serde
Date Thu, 19 May 2016 00:12:12 GMT

     [ https://issues.apache.org/jira/browse/HIVE-13708?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Hari Sankar Sivarama Subramaniyan updated HIVE-13708:
-----------------------------------------------------
    Attachment: HIVE-13708.3.patch

> Create table should verify datatypes supported by the serde
> -----------------------------------------------------------
>
>                 Key: HIVE-13708
>                 URL: https://issues.apache.org/jira/browse/HIVE-13708
>             Project: Hive
>          Issue Type: Bug
>          Components: Query Planning
>            Reporter: Thejas M Nair
>            Assignee: Hari Sankar Sivarama Subramaniyan
>            Priority: Critical
>         Attachments: HIVE-13708.1.patch, HIVE-13708.2.patch, HIVE-13708.3.patch
>
>
> As [~Goldshuv] mentioned in HIVE-7777.
> Create table with serde such as OpenCSVSerde allows for creation of table with columns
of arbitrary types. But 'describe table' would still return string datatypes, and so does
selects on the table.
> This is misleading and would result in users not getting intended results.
> The create table ideally should disallow the creation of such tables with unsupported
types.
> Example posted by [~Goldshuv] in HIVE-7777 -
> {noformat}
> CREATE EXTERNAL TABLE test (totalprice DECIMAL(38,10)) 
> ROW FORMAT SERDE 'com.bizo.hive.serde.csv.CSVSerde' with 
> serdeproperties ("separatorChar" = ",","quoteChar"= "'","escapeChar"= "\\") 
> STORED AS TEXTFILE 
> LOCATION '<some location>' 
> tblproperties ("skip.header.line.count"="1");
> {noformat}
> Now consider this sql:
> hive> select min(totalprice) from test;
> in this case given my data, the result should have been 874.89, but the actual result
became 100001.57 (as it is first according to byte ordering of a string type). this is a wrong
result.
> hive> desc extended test;
> OK
> o_totalprice        	string              	from deserializer
> ...



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