Michael Armbrust created SPARK-6459:
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Summary: Warn when Column API is constructing trivially true
equality
Key: SPARK-6459
URL: https://issues.apache.org/jira/browse/SPARK-6459
Project: Spark
Issue Type: Improvement
Components: SQL
Affects Versions: 1.3.0
Reporter: Michael Armbrust
Priority: Critical
Right now its pretty confusing when a user constructs and equality predicate
that is going to be use in a self join, where the optimizer cannot distinguish
between the attributes in question (e.g., [SPARK-6231]). Since there is
really no good reason to do this, lets print a warning.
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