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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