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https://issues.apache.org/jira/browse/CASSANDRA-13592?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16067987#comment-16067987
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Benjamin Lerer commented on CASSANDRA-13592:
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{quote}"list , set, map or UDT types" are not allowed in key{quote}
They are, as long as they are {{frozen}}.
Sorry, it seems that I was not clear. Fixing the problem in {{rowToJson}} or in
the {{ToJsonFct}} is in my opinion wrong. Most of the types will not change the
buffer position in the {{toJSONString}} method and I will argue that it is the
correct behavior. The {{toJSONString}} methods should not change the buffer
position.
If you fix it at a higher level, like in the {{rowToJson}} method or in the
{{ToJsonFct}} class, you let a potential bug in the code that can hit us later
if we add some new code that use the {{toJSONString}} method.
Moreover, your changes create in most of the cases some unnecessary objects.
The proper way to fix that problem is to fix the {{toJSONString}} methods that
changes the buffer position which seems to be the one of: {{TupleType}},
{{MapType}}, {{ListType}} and {{SetType}}.
> 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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