***UNCHECKED*** [jira] [Commented] (CASSANDRA-14245) SELECT JSON prints null on empty strings

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

    [ https://issues.apache.org/jira/browse/CASSANDRA-14245?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16620282#comment-16620282 ] 

Bruno commented on CASSANDRA-14245:
-----------------------------------

Thanks but when you import such exported using CQL.json(String), you have : 

Error decoding JSON value for value: Value '' is not a valid blob representation: String representation of blob is missing 0x prefix: 
com.datastax.driver.core.exceptions.InvalidQueryException: Error decoding JSON value for value: Value '' is not a valid blob representation: String representation of blob is missing 0x prefix: 
 at com.datastax.driver.core.Responses$Error.asException(Responses.java:148) ~[cassandra-driver-core-3.2.0.jar:?]

> SELECT JSON prints null on empty strings
> ----------------------------------------
>
>                 Key: CASSANDRA-14245
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-14245
>             Project: Cassandra
>          Issue Type: Bug
>          Components: CQL
>         Environment: Cassandra 3.11.2, Ubuntu 16.04 LTS
>  
>            Reporter: Norbert Schultz
>            Assignee: Francisco Fernandez
>            Priority: Major
>             Fix For: 3.11.3, 4.0
>
>
> SELECT JSON reports an empty string as null.
>  
> Example:
> {code:java}
> cqlsh:unittest> create table test(id INT, name TEXT, PRIMARY KEY(id));
> cqlsh:unittest> insert into test (id, name) VALUES (1, 'Foo');
> cqlsh:unittest> insert into test (id, name) VALUES (2, '');
> cqlsh:unittest> insert into test (id, name) VALUES (3, null);
> cqlsh:unittest> select * from test;
> id | name
> ----+------
>   1 |  Foo
>   2 |     
>   3 | null
> (3 rows)
> cqlsh:unittest> select JSON * from test;
> [json]
> --------------------------
> {"id": 1, "name": "Foo"}
> {"id": 2, "name": null}
> {"id": 3, "name": null}
> (3 rows){code}
>  
> This even happens, if the string is part of the Primary Key, which makes the generated string not insertable.
>  
> {code:java}
> cqlsh:unittest> create table test2 (id INT, name TEXT, age INT, PRIMARY KEY(id, name));
> cqlsh:unittest> insert into test2 (id, name, age) VALUES (1, '', 42);
> cqlsh:unittest> select JSON * from test2;
> [json]
> ------------------------------------
> {"id": 1, "name": null, "age": 42}
> (1 rows)
> cqlsh:unittest> insert into test2 JSON '{"id": 1, "name": null, "age": 42}';
> InvalidRequest: Error from server: code=2200 [Invalid query] message="Invalid null value in condition for column name"{code}
>  
> On an older version of Cassandra (3.0.8) does not have this problem.



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