[jira] [Updated] (DERBY-2465) Clob data type should use getCharacterStream() to read a column data from a VTI instead of getString().

["Mamta A. Satoor (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/DERBY-2465?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Mamta A. Satoor updated DERBY-2465:
-----------------------------------

    Urgency: Normal
     Labels: CLOB derby_triage10_10  (was: CLOB)
    
> Clob data type should use getCharacterStream() to read a column  data from a VTI instead of getString(). 
> ---------------------------------------------------------------------------------------------------------
>
>                 Key: DERBY-2465
>                 URL: https://issues.apache.org/jira/browse/DERBY-2465
>             Project: Derby
>          Issue Type: Improvement
>          Components: SQL
>    Affects Versions: 10.3.1.4
>            Reporter: Suresh Thalamati
>              Labels: CLOB, derby_triage10_10
>         Attachments: derby2465_v1.diff, derby.log
>
>
> Currently clob data is read as String. This can consume lot of memory when lot 
> of rows read from a VTI resultset. I think it would consume less memory if 
> data is read using streams. 
> org.apache.derby.iapi.types.SQLClob.java does not implement
> setValueFromResultSet() that is used by the VTI to read the data, it defaults
> to super class SQLChar.java implementation, which reads the data using 
> getString(). 
> One case I  noticed  the current implementation  uses lot of memory  is  when doing import of clobs(DERBY-378). 

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