[jira] [Commented] (HIVE-12274) Increase width of columns used for general configuration in the metastore.

["Elliot West (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/HIVE-12274?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15137015#comment-15137015 ] 

Elliot West commented on HIVE-12274:
------------------------------------

Hi, I have attached some sample code to reproduce. The snippet below shows the error we see. Note that the ellipsis are my own addition for brevity:
{code}
hive> CREATE EXTERNAL TABLE IF NOT EXISTS mytests.mybigtable
    > (
    > bigstruct STRUCT <
    >   myField1 : STRING,
...
    >   myField1000 : STRING
    > >
    > )
    > PARTITIONED BY (yymmdd STRING)
    > ROW FORMAT SERDE 'org.apache.hadoop.hive.contrib.serde2.JsonSerde'
    > STORED AS SEQUENCEFILE
    > LOCATION '/path-to/mybigtable/';
OK
Time taken: 4.86 seconds
hive> desc mytests.mybigtable;
FAILED: Execution Error, return code 1 from org.apache.hadoop.hive.ql.exec.DDLTask. Error: type expected at the position 3996 of 'struct<myField1:string,myField2:string,myField3:string,myField4:string,myField5:string,myField6:string, ... ,myField228:stri' but 'stri' is found.
hive>
{code}

> Increase width of columns used for general configuration in the metastore.
> --------------------------------------------------------------------------
>
>                 Key: HIVE-12274
>                 URL: https://issues.apache.org/jira/browse/HIVE-12274
>             Project: Hive
>          Issue Type: Improvement
>          Components: Metastore
>    Affects Versions: 2.0.0
>            Reporter: Elliot West
>            Assignee: Sushanth Sowmyan
>              Labels: metastore
>
> This issue is very similar in principle to HIVE-1364. We are hitting a limit when processing JSON data that has a large nested schema. The struct definition is truncated when inserted into the metastore database column {{COLUMNS_V2.YPE_NAME}} as it is greater than 4000 characters in length.
> Given that the purpose of these columns is to hold very loosely defined configuration values it seems rather limiting to impose such a relatively low length bound. One can imagine that valid use cases will arise where reasonable parameter/property values exceed the current limit. Can these columns not use CLOB-like types as for example as used by {{TBLS.VIEW_EXPANDED_TEXT}}? It would seem that suitable type equivalents exist for all targeted database platforms:
> * MySQL: {{mediumtext}}
> * Postgres: {{text}}
> * Oracle: {{CLOB}}
> * Derby: {{LONG VARCHAR}}
> I'd suggest that the candidates for type change are:
> * {{COLUMNS_V2.TYPE_NAME}}
> * {{TABLE_PARAMS.PARAM_VALUE}}
> * {{SERDE_PARAMS.PARAM_VALUE}}
> * {{SD_PARAMS.PARAM_VALUE}}
> Finally, will this limitation persist in the work resulting from HIVE-9452?



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