GitHub user sameeragarwal opened a pull request:
https://github.com/apache/spark/pull/13209
[SPARK-15425][SQL] Disallow cartesian joins by default
## What changes were proposed in this pull request?
In order to prevent users from inadvertently writing queries with cartesian
joins, this patch introduces a new conf `spark.sql.join.cartesian.enabled` (set
to `false` by default) that if not set, results in an `AnalysisException` if
the query contains one or more cartesian products.
## How was this patch tested?
Added a test to verify the new behavior in `JoinSuite`. Additionally,
`SQLQuerySuite` and `SQLMetricsSuite` were modified to explicitly enable
cartesian products.
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/sameeragarwal/spark disallow-cartesian
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/spark/pull/13209.patch
To close this pull request, make a commit to your master/trunk branch
with (at least) the following in the commit message:
This closes #13209
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commit 2c4d6e29e1e7921b23a0ca45b8a9882a6a4c53a3
Author: Sameer Agarwal <sam...@databricks.com>
Date: 2016-05-20T02:04:04Z
Disallow cartesian joins by default
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