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https://issues.apache.org/jira/browse/CASSANDRA-17617?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17553509#comment-17553509
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Berenguer Blasi commented on CASSANDRA-17617:
---------------------------------------------

bq. I added your changes to my PR. If you're happy with that you can just move 
this one on if you please.

Thanks [~tanujnay] yes I noticed that. But I have to put up PRs anyway for all 
maintained versions, add CI and then another committer/reviewer to +1 that, 
which is the table I just posted. Then I'll merge all that with proper 
attribution ofc! :-)

> CQLSH unicode control character list is too liberal
> ---------------------------------------------------
>
>                 Key: CASSANDRA-17617
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-17617
>             Project: Cassandra
>          Issue Type: Improvement
>          Components: CQL/Interpreter
>            Reporter: Tanuj Nayak
>            Assignee: Tanuj Nayak
>            Priority: Normal
>             Fix For: 3.11.x, 4.0.x, 4.1-rc
>
>
> It appears that the list of escaped unicode control characters 
> [here|https://github.com/apache/cassandra/blob/53a67ff2c36d90d337aba1409498de29931d4279/pylib/cqlshlib/formatting.py#L32]
>  is a bit too liberal. It seems to include characters such as '1' (0x31) and 
> '0' (0x30) which do not need to be escaped. It seems that the actual range 
> should be 0x00 - 0x1F and 0x7F+ as corroborated [by this 
> page|https://en.wikipedia.org/wiki/Unicode_control_characters].
>  
> This causes unnecessary escaping and regex substitutions on the CQLSH end 
> whenever common characters such as any punctuation or a 0 or a 1 appear in 
> the text column of a table. One might notice that a table with a text column 
> filled with 2's will take much less time to print than one with all 0's for 
> this reason.



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