[jira] [Created] (SPARK-16322) Avoids unnecessary cast when doing integral divide

[Sean Zhong (JIRA)]

Sean Zhong created SPARK-16322:
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             Summary: Avoids unnecessary cast when doing integral divide
                 Key: SPARK-16322
                 URL: https://issues.apache.org/jira/browse/SPARK-16322
             Project: Spark
          Issue Type: Improvement
          Components: SQL
            Reporter: Sean Zhong
            Priority: Minor


This is a follow up of https://databricks.atlassian.net/browse/SC-3588

*Problem:*

For Integer divide operator {{div}}:
{code}
scala> spark.sql("select 6 div 3").explain(true)
...
== Analyzed Logical Plan ==
CAST((6 / 3) AS BIGINT): bigint
Project [cast((cast(6 as double) / cast(3 as double)) as bigint) AS CAST((6 / 
3) AS BIGINT)#5L]
+- OneRowRelation$
...
{code}

For performance reason, we should not do unnecessary {{cast(xx as double)}}



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