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https://issues.apache.org/jira/browse/IGNITE-6500?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16478990#comment-16478990
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ASF GitHub Bot commented on IGNITE-6500:
----------------------------------------

Github user kotamrajuyashasvi closed the pull request at:

    https://github.com/apache/ignite/pull/2992


> POJO fields of java wrapper type are not retaining null values from Cassandra 
> persistent store, while using ignite's CassandraCacheStoreFactory
> -----------------------------------------------------------------------------------------------------------------------------------------------
>
>                 Key: IGNITE-6500
>                 URL: https://issues.apache.org/jira/browse/IGNITE-6500
>             Project: Ignite
>          Issue Type: Bug
>          Components: cassandra
>    Affects Versions: 2.1
>            Reporter: Yashasvi Kotamraju
>            Assignee: Yashasvi Kotamraju
>            Priority: Minor
>              Labels: patch
>             Fix For: 2.6
>
>
> While using  ignite's CassandraCacheStoreFactory(part of 
> ignite-cassandra-store.jar) as cacheStoreFactory for a cache, if a POJO field 
> is of wrapper class type, and the column value mapped in Cassandra persistent 
> store is null then the POJO field is getting set to default primitive type 
> instead of null.
> For Example: Assume a table 'person' in a Cassandra persistent store with the 
> following structure and data.
> *table person:*
> *column*    person_no(int)    phno(text)         address(text)      age(int)  
>     name(text)   
> *data*         1                         12353               null             
>          null            yash 
> person_no is the PRIMARY_KEY.
> This table is mapped to person POJO  for ignite cache.
> public class person{
>       private int person_no;
>       private String name;
>       private Integer age=null;
>       private String phno;
>       private String address;
>         .....getters and setters etc......
> }
> Now we load the row from Cassandra into ignite cache using cache.get(1) or 
> cache.load(..) And we are using ignite's CassandraCacheStoreFactory for this 
> cache.
> Let person p1 = cache.get(1);
> now p1.getName returns "yash", p1.getAddress returns null.
> But  p1.getAge returns 0 instead of null. It is expected null value since the 
> value is null in Cassandra persistent store.
> Hence if the value is 0 for the age field there is no way differentiate if it 
> was null or it was actually 0. The similar problem exists for other wrapper 
> types -> Long, Float, Double, Boolean.
> This problem cause is as follows. 
> In 
> org.apache.ignite.cache.store.cassandra.persistence.PojoField.setValueFromRow(..)
>  method first the Cassandra field value is obtained by using the method 
> PropertyMappingHelper.getCassandraColumnValue(..). This method calls DataStax 
> Driver methods Row.getInt() or Row.getFloat() or Row.getDouble() etc.. 
> depending upon the column. This value obtained from this method is then set 
> to the respective POJO field. But According to Datastax documentation getInt 
> returns 0 if column value is null and similarly getLong returns 0L , 
> getDouble return 0.0 etc. Hence PropertyMappingHelper. 
> getCassandraColumnValue returns 0 or 0L or 0.0 or false even if the value is 
> null. And then this value is set to the wrapper type POJO fields. The problem 
> only persists with the primitive data types in Cassandra mapped to wrapper 
> type fields in POJO. For other types like String , Date etc.. the null values 
> are retained in the POJO fields. 



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