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https://issues.apache.org/jira/browse/CASSANDRA-13592?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16066797#comment-16066797
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Benjamin Lerer commented on CASSANDRA-13592:
--------------------------------------------
Thanks for the patch.
The {{pagingOnToJsonQuery()}} test is passing even without the change to
{{Selection::rowToJson}}. After looking into it seems that the problem is in
fact in {{TupleType::toJSONString}}. The method is actually moving the buffer
position while it should not. Which is why simple types like {{int}} or
{{text}} are not affected by the problem.
I guess that we might have similar problems with the {{list}}, {{set}}, {{map}}
or UDT types. So, it will be nice to add some extra tests for those type as
well.
I would put the tests in {{JsonTest}} instead of in {{PagingQueryTest}}.
The {{json}} support has been introduced in 2.2 so we will also need some
patches for 2.2, 3.0, 3.11.
> Null Pointer exception at SELECT JSON statement
> -----------------------------------------------
>
> Key: CASSANDRA-13592
> URL: https://issues.apache.org/jira/browse/CASSANDRA-13592
> Project: Cassandra
> Issue Type: Bug
> Components: CQL
> Environment: Debian Linux
> Reporter: Wyss Philipp
> Assignee: ZhaoYang
> Labels: beginner
> Attachments: system.log
>
>
> A Nulll pointer exception appears when the command
> {code}
> SELECT JSON * FROM examples.basic;
> ---MORE---
> <Error from server: code=0000 [Server error]
> message="java.lang.NullPointerException">
> Examples.basic has the following description (DESC examples.basic;):
> CREATE TABLE examples.basic (
> key frozen<tuple<uuid, int>> PRIMARY KEY,
> wert text
> ) WITH bloom_filter_fp_chance = 0.01
> AND caching = {'keys': 'ALL', 'rows_per_partition': 'NONE'}
> AND comment = ''
> AND compaction = {'class':
> 'org.apache.cassandra.db.compaction.SizeTieredCompactionStrategy',
> 'max_threshold': '32', 'min_threshold': '4'}
> AND compression = {'chunk_length_in_kb': '64', 'class':
> 'org.apache.cassandra.io.compress.LZ4Compressor'}
> AND crc_check_chance = 1.0
> AND dclocal_read_repair_chance = 0.1
> AND default_time_to_live = 0
> AND gc_grace_seconds = 864000
> AND max_index_interval = 2048
> AND memtable_flush_period_in_ms = 0
> AND min_index_interval = 128
> AND read_repair_chance = 0.0
> AND speculative_retry = '99PERCENTILE';
> {code}
> The error appears after the ---MORE--- line.
> The field "wert" has a JSON formatted string.
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