Hi I'm using ignite with cassandra as persistent store. I have a POJO class mapped to cassandra table. I have used ignite-cassandra-store/KeyValuePersistenceSettings xml bean to map POJO to cassandra table. In the POJO one of the fields is Integer (wrapper class) mapped to int column in cassandra table. When I load any row having this int field as null in cassandra, I'm getting that respective field in POJO as 0, which is default value of primitive type int. Same is the case when using other wrapper classes. How can I get that field as null when the actual column field is null in cassandra, since wrapper object can be null.
I found a work around by using custom class extending CacheStoreAdapter and using this class in cache configuration in cacheStoreFactory property,instead of using ignite-cassandra-store. This class overrides load,write and delete methods. In load method I connect to cassandra database using Datastax driver, and load respective row depending upon the key passed as parameter to load, and then create a new POJO whose fields are set to the fields of row returned from cassandra and return the POJO. During this process I make a check if the int field that I mentioned above is null in cassandra by using Row.isNull method of Datastaxdriver and if its not null only then I set POJO field to the field value returned from cassandra, else it will remain as null. Is it a bug in ignite-cassandra-store, where I cannot retain null value of cassandra table field for primitive types mapped to wrapper classes in POJO in ignite? The reason I have used wrapper class objects is to identify if its null in cassandra or not, but there seems no way to differentiate between primitive type default value and null when using ignite-cassandra-store. -- Sent from: http://apache-ignite-developers.2346864.n4.nabble.com/
