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Commit e21e1c94 authored by Felix Cheung's avatar Felix Cheung Committed by Felix Cheung
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[SPARK-18013][SPARKR] add crossJoin API 

## What changes were proposed in this pull request?

Add crossJoin and do not default to cross join if joinExpr is left out

## How was this patch tested?

unit test

Author: Felix Cheung <felixcheung_m@hotmail.com>

Closes #15559 from felixcheung/rcrossjoin.
parent 4efdc764
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