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Posted to issues@phoenix.apache.org by "chenglei (JIRA)" <ji...@apache.org> on 2019/04/01 06:02:00 UTC
[jira] [Comment Edited] (PHOENIX-5217) Incorrect result for COUNT
DISTINCT ... limit ...
[ https://issues.apache.org/jira/browse/PHOENIX-5217?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16805593#comment-16805593 ]
chenglei edited comment on PHOENIX-5217 at 4/1/19 6:01 AM:
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[~fengchen8086], “group by pk1” is added for {{select count(disctinct("pk1")) from "t1" limit 1}} because we want to add a {{DistinctPrefixFilter}} to scan to optimize {{count(distinct)}}
It is indeed a bug introduced by PHOENIX-3501, I will make a patch for it.
was (Author: comnetwork):
[~fengchen8086], A {{group by pk1}} is added for {{select count(disctinct("pk1")) from "t1" limit 1}} because we want to add a {{DistinctPrefixFilter}} to scan to optimize {{count(distinct)}}
It is indeed a bug introduced by PHOENIX-3501, I will make a patch for it.
> Incorrect result for COUNT DISTINCT ... limit ...
> -------------------------------------------------
>
> Key: PHOENIX-5217
> URL: https://issues.apache.org/jira/browse/PHOENIX-5217
> Project: Phoenix
> Issue Type: Bug
> Affects Versions: 4.14.1
> Environment: 4.14.1: incorrect
> 4.6: correct.
>
> Reporter: Chen Feng
> Priority: Critical
>
> For table t1(pk1, col1, CONSTRAINT(pk1))
> upsert into "t1" values (1, 1);
> upsert into "t1" values (2, 2);
> sql A: select count("pk1") from "t1" limit 1, return 2 [correct]
> sql B: select count(disctinct("pk1")) from "t1" limit 1, return 1 [incorrect]
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