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From Xinran Yu Tinney <yuxinran8...@gmail.com>
Subject Re: What kind of sql query can generate multiple children for EXCHANGE node?
Date Mon, 05 Feb 2018 23:27:56 GMT
Thanks Alex, should we clarify this in the comment of ExchangNode.java
"Typically, an ExchangeNode only has a single sender child but,
 e.g., for distributed union queries an ExchangeNode may have one sender
child per
 union operand."

2018-02-05 11:53 GMT-06:00 Alexander Behm <alex.behm@cloudera.com>:

> An exchange node can only have one child
>
> On Mon, Feb 5, 2018 at 9:52 AM, Xinran Yu Tinney <yuxinran8011@gmail.com>
> wrote:
>
> > Hi, Impala dev,
> >    I am working on Jira IMPALA-5440
> > <https://issues.apache.org/jira/browse/IMPALA-5440> and one of the
> problem
> > is to test that Impala will handle cardinality overflow when there are
> > multiple children under EXCHANGE node. I searched among the examples of
> > .test file and could not find one. I was wondering if anyone has
> experience
> > running such queries? Thanks!
> >
> >
> > Xinran
> >
>

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