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https://issues.apache.org/jira/browse/CASSANDRA-4921?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13491658#comment-13491658
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Jonathan Ellis commented on CASSANDRA-4921:
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It looks like we can work around the regexp performance problems simply by
omitting them if params is empty (which it is since cqlsh does its own param
substitution).
To do this cleanly we should update cqlsh in 1.1 to be compatible with
python-cql master.
However, since 1.1 is unlikely to need further python-cql enhancements,
creating a 1.1 branch with the params fix is also fine.
> improve cqlsh COPY FROM performance
> -----------------------------------
>
> Key: CASSANDRA-4921
> URL: https://issues.apache.org/jira/browse/CASSANDRA-4921
> Project: Cassandra
> Issue Type: Improvement
> Components: Tools
> Affects Versions: 1.1.2
> Reporter: Jonathan Ellis
> Assignee: Aleksey Yeschenko
> Priority: Minor
> Fix For: 1.1.7, 1.2.0
>
>
> Profiling shows that prepare_inline takes the vast majority of cqlsh COPY
> FROM time, particularly on csv rows with many columns.
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