Srinath created SPARK-17298:
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Summary: Require explicit CROSS join for cartesian products
Key: SPARK-17298
URL: https://issues.apache.org/jira/browse/SPARK-17298
Project: Spark
Issue Type: Story
Components: SQL
Reporter: Srinath
Require the use of CROSS join syntax in SQL (and a new crossJoin DataFrame API)
to specify explicit cartesian products between relations.
By cartesian product we mean a join between relations R and S where there is no
join condition involving columns from both R and S.
If a cartesian product is detected in the absence of an explicit CROSS join, an
error must be thrown. Turning on the spark.sql.crossJoin.enabled configuration
flag will disable this check and allow cartesian products without an explicit
cross join.
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