[jira] [Created] (SPARK-26962) Windows Function LEAD in Spark SQL is not fetching consistent results.

["Shiva Sankari Perambalam (JIRA)" <ji...@apache.org>]

Shiva Sankari Perambalam created SPARK-26962:
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             Summary: Windows Function LEAD in Spark SQL is not fetching consistent results.
                 Key: SPARK-26962
                 URL: https://issues.apache.org/jira/browse/SPARK-26962
             Project: Spark
          Issue Type: Bug
          Components: SQL
    Affects Versions: 2.4.0
            Reporter: Shiva Sankari Perambalam


Using a Lead function on a DATETIME column is giving inconsistent results in Spark sql.
{code:java}
Lead(date) over (partition by id, code order by date){code}
where Date is DATETIME, id and code is a String.
{code:java}
val testdf1= sparkSession.sql(s""" select date, Lead(date) over (partition by id, code order by date) as lead_date from <SOME_VIEW>"""){code}
The result set is sometimes having the same data as the date instead of the lead_date

 



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