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https://issues.apache.org/jira/browse/HIVE-22929?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17047310#comment-17047310
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Gopal Vijayaraghavan commented on HIVE-22929:
---------------------------------------------
bq. Could you please provide a sample query for this? it might be interesting
to take a look at it - in case it heats up something like a "String.replaceAll"
function
This was from a profile with 100k queries running on a system - the best
approximation is that it is 56 different queries with varying predicates &
giant list of projection column names, with 256 concurrent users.
Wasn't from a single query or a single user.
> Performance: quoted identifier parsing uses throwaway Regex via
> String.replaceAll()
> -----------------------------------------------------------------------------------
>
> Key: HIVE-22929
> URL: https://issues.apache.org/jira/browse/HIVE-22929
> Project: Hive
> Issue Type: Bug
> Reporter: Gopal Vijayaraghavan
> Assignee: Krisztian Kasa
> Priority: Major
> Attachments: HIVE-22929.1.patch, String.replaceAll.png
>
>
> !String.replaceAll.png!
> https://github.com/apache/hive/blob/master/parser/src/java/org/apache/hadoop/hive/ql/parse/HiveLexer.g#L530
> {code}
> '`' ( '``' | ~('`') )* '`' { setText(getText().substring(1,
> getText().length() -1 ).replaceAll("``", "`")); }
> {code}
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