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Posted to dev@phoenix.apache.org by "Rajeshbabu Chintaguntla (JIRA)" <ji...@apache.org> on 2018/02/19 11:46:00 UTC
[jira] [Commented] (PHOENIX-4288) Indexes not used when ordering by
primary key
[ https://issues.apache.org/jira/browse/PHOENIX-4288?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16369035#comment-16369035 ]
Rajeshbabu Chintaguntla commented on PHOENIX-4288:
--------------------------------------------------
[~maryannxue] This is missing in 5.x branch. Can you please commit to the branch as well. Thanks.
> Indexes not used when ordering by primary key
> ---------------------------------------------
>
> Key: PHOENIX-4288
> URL: https://issues.apache.org/jira/browse/PHOENIX-4288
> Project: Phoenix
> Issue Type: Sub-task
> Reporter: Marcin Januszkiewicz
> Assignee: Maryann Xue
> Priority: Major
> Labels: CostBasedOptimization
> Fix For: 4.14.0
>
> Attachments: PHOENIX-4288.patch
>
>
> We have a table
> CREATE TABLE t (
> rowkey VARCHAR PRIMARY KEY,
> c1 VARCHAR,
> c2 VARCHAR
> )
> which we want to query by doing partial matches on c1, and keep the ordering of the source table:
> SELECT rowkey, c1, c2 FROM t where c1 LIKE 'X0%' ORDER BY rowkey;
> We expect most queries to select a small subset of the table, so we create an index to speed up searches:
> CREATE LOCAL INDEX t_c1_ix ON t (c1);
> However, this index will not be used since Phoenix will always choose not to resort the data.
> In our actual use case, adding index hints is not a practical solution.
> See also discussion at:
> https://lists.apache.org/thread.html/26ab58288eb811d2f074c3f89067163d341e5531fb581f3b2486cf43@%3Cuser.phoenix.apache.org%3E
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