[
https://issues.apache.org/jira/browse/TAJO-1403?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14374952#comment-14374952
]
ASF GitHub Bot commented on TAJO-1403:
--------------------------------------
Github user jihoonson commented on a diff in the pull request:
https://github.com/apache/tajo/pull/434#discussion_r26903480
--- Diff:
tajo-plan/src/main/java/org/apache/tajo/plan/util/PlannerUtil.java ---
@@ -133,11 +134,90 @@ public static boolean checkIfSimpleQuery(LogicalPlan
plan) {
}
}
}
+
+ if (!noWhere && scanNode.getTableDesc().isExternal() &&
scanNode.getTableDesc().getPartitionMethod() != null) {
--- End diff --
A managed table can also be partitioned.
Would you explain why you added the isExternal() condition?
> Improve 'Simple Query' with only partition columns and constant values
> ----------------------------------------------------------------------
>
> Key: TAJO-1403
> URL: https://issues.apache.org/jira/browse/TAJO-1403
> Project: Tajo
> Issue Type: Improvement
> Reporter: Dongjoon Hyun
> Assignee: Dongjoon Hyun
> Fix For: 0.11.0
>
> Attachments: TAJO-1403.patch
>
>
> Tajo shows a very fast response for a simple query (
> https://cwiki.apache.org/confluence/display/TAJO/Simple+Query+and+Forwarded+Query)
> like the followings.
> {code:sql}
> select * from t1 limit 10;
> {code}
> However, in many cases, tables have partitions.
> {code:sql}
> create external table t1(id int) using csv with ('csvfile.delimiter'='|')
> partition by column(dt text) location '/data';
> select * from t1 where dt='2015-03-15' limit 10;
> {code}
> If all predicates in WHERE consist of partition columns and 'EQUAL'
> predicates with constant values, I think Tajo can handle these cases very
> fast.
> This kind of queries is very popular for DevOps users and simple ETL apps.
--
This message was sent by Atlassian JIRA
(v6.3.4#6332)
