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https://issues.apache.org/jira/browse/CASSANDRA-13573?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16078133#comment-16078133
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Chris Lohfink commented on CASSANDRA-13573:
-------------------------------------------
The json transformer uses jackson's JsonGenerator so you do not need things
designed to be in json output. Switching to {{toJSONString}} would end up
double escaped as the jackson generator will try to remove the json encoding
from the JSONString output.
If I remember correctly pretty much all UDTs were not supported initially
because the information to deserialize the UDT requires the system schema
tables to be read, which may not be available unless running on the same system
with exact configuration and requires client initialization (which is dangerous
and we dont want to do). If we have adequate info to deserialize the UDTs from
the stats metadata it probably just needs a different check to handle it.
> sstabledump doesn't print out tombstone information for frozen set collection
> -----------------------------------------------------------------------------
>
> Key: CASSANDRA-13573
> URL: https://issues.apache.org/jira/browse/CASSANDRA-13573
> Project: Cassandra
> Issue Type: Bug
> Components: Tools
> Reporter: Stefano Ortolani
> Assignee: ZhaoYang
>
> Schema and data"
> {noformat}
> CREATE TABLE ks.cf (
> hash blob,
> report_id timeuuid,
> subject_ids frozen<set<int>>,
> PRIMARY KEY (hash, report_id)
> ) WITH CLUSTERING ORDER BY (report_id DESC);
> INSERT INTO ks.cf (hash, report_id, subject_ids) VALUES (0x1213, now(),
> {1,2,4,5});
> {noformat}
> sstabledump output is:
> {noformat}
> sstabledump mc-1-big-Data.db
> [
> {
> "partition" : {
> "key" : [ "1213" ],
> "position" : 0
> },
> "rows" : [
> {
> "type" : "row",
> "position" : 16,
> "clustering" : [ "ec01eed0-49d9-11e7-b39a-97a96f529c02" ],
> "liveness_info" : { "tstamp" : "2017-06-05T10:29:57.434856Z" },
> "cells" : [
> { "name" : "subject_ids", "value" : "" }
> ]
> }
> ]
> }
> ]
> {noformat}
> While the values are really there:
> {noformat}
> cqlsh:ks> select * from cf ;
> hash | report_id | subject_ids
> --------+--------------------------------------+-------------
> 0x1213 | 02bafff0-49d9-11e7-b39a-97a96f529c02 | {1, 2, 4}
> {noformat}
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