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Posted to issues@drill.apache.org by "Chun Chang (JIRA)" <ji...@apache.org> on 2017/03/10 01:19:38 UTC
[jira] [Closed] (DRILL-568) set NO_EXCHANGES=true did not have any
effect
[ https://issues.apache.org/jira/browse/DRILL-568?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Chun Chang closed DRILL-568.
----------------------------
> set NO_EXCHANGES=true did not have any effect
> ---------------------------------------------
>
> Key: DRILL-568
> URL: https://issues.apache.org/jira/browse/DRILL-568
> Project: Apache Drill
> Issue Type: Bug
> Reporter: Chun Chang
> Fix For: 0.4.0
>
>
> 0: jdbc:drill:schema=dfs> alter session set NO_EXCHANGES=true;
> +------------+------------+
> | ok | summary |
> +------------+------------+
> | true | disabled exchanges. |
> +------------+------------+
> 1 row selected (0.016 seconds)
> The explain plan for still shows we hash to random exchange:
> 0: jdbc:drill:schema=dfs> explain plan for select cast(customer.country as varchar(20)) as c0 from customer as customer where UPPER(cast(customer.country as varchar(20))) = UPPER('USA') group by cast(customer.country as varchar(20));
> +------------+------------+
> | text | json |
> +------------+------------+
> ....
> }, {
> "pop" : "hash-to-random-exchange",
> "@id" : 5,
> "child" : 4,
> "expr" : "hash(`c0`) "
> }, {
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