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Posted to issues@calcite.apache.org by "Ted Xu (JIRA)" <ji...@apache.org> on 2018/10/11 01:53:00 UTC
[jira] [Created] (CALCITE-2619) Reduce string literal creation cost
by removing charset check
Ted Xu created CALCITE-2619:
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Summary: Reduce string literal creation cost by removing charset check
Key: CALCITE-2619
URL: https://issues.apache.org/jira/browse/CALCITE-2619
Project: Calcite
Issue Type: Improvement
Components: core
Reporter: Ted Xu
Assignee: Julian Hyde
The cost of creating NlsString is very high, due to its charset check. In some cases, e.g., expression evaluate because of Partition Prune, the NlsString creation costs 40%+ of total executor's overhead.
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