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 <[email protected]>: > An exchange node can only have one child > > On Mon, Feb 5, 2018 at 9:52 AM, Xinran Yu Tinney <[email protected]> > 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 > > >
