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https://issues.apache.org/jira/browse/KUDU-1938?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16987385#comment-16987385
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ASF subversion and git services commented on KUDU-1938:
-------------------------------------------------------
Commit e45f893981a36d721752f1e0c743cdf18a6f5428 in kudu's branch
refs/heads/master from Attila Bukor
[ https://gitbox.apache.org/repos/asf?p=kudu.git;h=e45f893 ]
KUDU-1938 Make UTF-8 truncation faster pt 2
Adds Intel Intrinsics (up to SSE4.2) to speed up the processing of UTF8
character counting in the case of ASCII-only chunks (fast path) by
doubling the chunk size in a single pass from 64 to 128 bits.
Before:
[ RUN ] CharUtilTest.StressTestUtf8
[ OK ] CharUtilTest.StressTestUtf8 (7746 ms)
[ RUN ] CharUtilTest.StressTestAscii
[ OK ] CharUtilTest.StressTestAscii (1028 ms)
After:
[ RUN ] CharUtilTest.StressTestUtf8
[ OK ] CharUtilTest.StressTestUtf8 (9285 ms)
[ RUN ] CharUtilTest.StressTestAscii
[ OK ] CharUtilTest.StressTestAscii (708 ms)
Change-Id: I9a491157dd5c8b4815030bbda921a0afc0bafd28
Reviewed-on: http://gerrit.cloudera.org:8080/14354
Reviewed-by: Adar Dembo <[email protected]>
Tested-by: Kudu Jenkins
> Support for VARCHAR type
> ------------------------
>
> Key: KUDU-1938
> URL: https://issues.apache.org/jira/browse/KUDU-1938
> Project: Kudu
> Issue Type: New Feature
> Components: client, tablet
> Reporter: Farzana Kader
> Assignee: Attila Bukor
> Priority: Major
> Labels: limitations, roadmap-candidate
>
> VARCHAR is currently not supported by Kudu. This is functionality that
> currently exists in Impala. Some client applications convert STRING to 32K
> bytes which causes performance issues so they need the VARCHAR support in
> order to integrate well with Kudu.
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