[jira] [Created] (SPARK-19435) Type coercion between ArrayTypes

["Hyukjin Kwon (JIRA)" <ji...@apache.org>]

Hyukjin Kwon created SPARK-19435:
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             Summary: Type coercion between ArrayTypes
                 Key: SPARK-19435
                 URL: https://issues.apache.org/jira/browse/SPARK-19435
             Project: Spark
          Issue Type: Improvement
          Components: SQL
    Affects Versions: 2.2.0
            Reporter: Hyukjin Kwon


It seems currently we don't allow type coercion between arrays. We now implicitly cast it in SPARK-18624

So, the below codes are not working now.

{code}
Seq(Array(1)).toDF("a").selectExpr("greatest(a, array(1D))")
Seq(Array(1)).toDF("a").selectExpr("least(a, array(1D))")
sql("SELECT * FROM values (array(0)), (array(1D)) as data(a)")
Seq(Array(1)).toDF("a").union(Seq(Array(1D)).toDF("b"))
sql("SELECT IF(1=1, array(1), array(1D))")
{code}




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