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Posted to issues@hive.apache.org by "Gopal V (JIRA)" <ji...@apache.org> on 2018/10/10 03:50:00 UTC
[jira] [Updated] (HIVE-20501) Vectorization: Closed range fast-path
for Fast Long hashset
[ https://issues.apache.org/jira/browse/HIVE-20501?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Gopal V updated HIVE-20501:
---------------------------
Resolution: Won't Fix
Status: Resolved (was: Patch Available)
> Vectorization: Closed range fast-path for Fast Long hashset
> ------------------------------------------------------------
>
> Key: HIVE-20501
> URL: https://issues.apache.org/jira/browse/HIVE-20501
> Project: Hive
> Issue Type: Improvement
> Reporter: Gopal V
> Assignee: Gopal V
> Priority: Major
> Attachments: HIVE-20501.1.patch
>
>
> In scenarios where the surrogate keys are entirely contiguous, the cache can offer a fast-path for [min,max], without a further lookup in the hashtable.
> {code}
> hive> select min(c_customer_sk), max(c_customer_sk), max(c_customer_sk) - min(c_customer_sk), count(1) from customer;
> 1 65000000 64999999 65000000
> {code}
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