[jira] [Updated] (THRIFT-3304) C# thrift.dll generates default values of fields instead of 'null'

["Kaveen Raajan (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/THRIFT-3304?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Kaveen Raajan updated THRIFT-3304:
----------------------------------
    Summary: C# thrift.dll generates default values of fields instead of 'null'  (was: C# thrift.dll generates default values of fields instead of null)

> C# thrift.dll generates default values of fields instead of 'null'
> ------------------------------------------------------------------
>
>                 Key: THRIFT-3304
>                 URL: https://issues.apache.org/jira/browse/THRIFT-3304
>             Project: Thrift
>          Issue Type: Bug
>          Components: C# - Compiler, C# - Library
>    Affects Versions: 0.9.2
>         Environment: Windows 8, Hive1.1.0, HiveServer2
>            Reporter: Kaveen Raajan
>              Labels: build
>
> I'm currently using HiveServer2 with thrift.dll library. If I try to make a tuple from a thrift object, I expect that fields that were not set in the object, are marked null in tuple. However instead default values are put into the tuple. E.g.
> {code}
> HqlConnection con = new HqlConnection("localhost", 10001, HiveServer.HiveServer2);
> con.Open();
> HqlCommand createCommand1 = new HqlCommand("select id,name,age,DOB,marks from engineer_list", con);
> createCommand1.ExecuteNonQuery();
> HqlDataReader reader = createCommand1.ExecuteReader();
> {code}
> expected output should be
> {(1,'John',24,2010-01-01 10:22:47,45.6),
> (2,null,null,null,null)}
> but actual result was:
> {(1,'John',24,2010-01-01 10:22:47,45.6),
> (2,,,0,0)}
> When we send request to call numeric column which contain NULL value for a type (int, double, long, float..) means ‘thrift.dll’ itself return as zero instead of 'null' or 'DBNull.value'.
> For string, timestamp type mean 'thrift.dll' itself return as empty string instead of 'null' or 'DBNull.value'.
> By analyzing the source of thrift.dll, we trigger out the method for reading the column by following 
> *Class*: Thrift.Protocol.TBinaryProtocol
> *Method*: ReadAll(buffer, offset, length) by default it return as zero.
> *Description*: This will get stream of data from thriftServer port
> For Int value following method are call this will return as '0' if data contain 'null'
> {code}
> private byte[] i32in = new byte[4];
> public override int ReadI32()
> {
>   ReadAll(i32in, 0, 4);
>   return (int)(((i32in[0] & 0xff) << 24) | ((i32in[1] & 0xff) << 16) | ((i32in[2] & 0xff) << 8) | ((i32in[3] & 0xff)));
> }
> {code}



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