Josh Rosen created SPARK-13105:
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Summary: Spark 1.6 and earlier should reject NATURAL JOIN queries
instead of returning wrong answers
Key: SPARK-13105
URL: https://issues.apache.org/jira/browse/SPARK-13105
Project: Spark
Issue Type: Bug
Components: SQL
Affects Versions: 1.6.0, 1.5.2, 1.4.1
Reporter: Josh Rosen
Assignee: Josh Rosen
In Spark 1.6 and earlier, Spark SQL does not support {{NATURAL JOIN}} queries.
However, its SQL parser does not consider {{NATURAL}} to be a reserved word,
which causes natural joins to be parsed as regular joins where the left table
has been aliased. For instance,
{code}
SELECT * FROM foo NATURAL JOIN bar
{code}
gets interpreted as "foo JOIN bar" where "foo" is aliased to "natural".
Rather than doing this, which leads to confusing / wrong results for users who
expect NATURAL JOIN behavior, Spark should immediately reject these queries at
analysis time and should provide an informative error message.
We're going to add natural join support in Spark 2.0, but for earlier versions
we should add a bugfix to throw errors.
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