+---+----+-----+
| id|size|brand|
+---+----+-----+
|  1|   a| null|
+---+----+-----+

org.apache.spark.sql.AnalysisException: Detected implicit cartesian product for LEFT OUTER join between logical plans
LocalRelation [id#278L, size#279]
and
Project [ AS brand#55]
+- LogicalRDD false
Join condition is missing or trivial.
Either: use the CROSS JOIN syntax to allow cartesian products between these
relations, or: enable implicit cartesian products by setting the configuration
variable spark.sql.crossJoin.enabled=true;