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https://issues.apache.org/jira/browse/CASSANDRA-14245?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16620282#comment-16620282
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Bruno edited comment on CASSANDRA-14245 at 9/19/18 8:23 AM:
------------------------------------------------------------
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$Error.asException(Responses.java:148)
~C[cassandra-driver-core-3.2.0.jar:?]
Can you Reopen this ticket ?
was (Author: brunoz):
Thanks but when you import such exported using CQL.json(String), you have :
Error decoding JSON value for value: Value '' is not a valid blob
representation: String representation of blob is missing 0x prefix:
com.datastax.driver.core.exceptions.InvalidQueryException: Error decoding JSON
value for value: Value '' is not a valid blob representation: String
representation of blob is missing 0x prefix:
at com.datastax.driver.core.Responses$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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