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https://issues.apache.org/jira/browse/IGNITE-6500?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16502074#comment-16502074
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Dmitriy Pavlov commented on IGNITE-6500:
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Hi [~irudyak], could you please take a look to new version of fix?
> 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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