[jira] [Created] (SPARK-28068) `lag` second argument must be a literal

["Dylan Guedes (JIRA)" <ji...@apache.org>]

Dylan Guedes created SPARK-28068:
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             Summary: `lag` second argument must be a literal
                 Key: SPARK-28068
                 URL: https://issues.apache.org/jira/browse/SPARK-28068
             Project: Spark
          Issue Type: Task
          Components: SQL
    Affects Versions: 3.0.0
            Reporter: Dylan Guedes


Currently in Spark, `lag` (and, possible, some other window functions) requires the 2nd argument to be a literal.
For example, this is not allowed:

{code:sql}
SELECT lag(ten, four) OVER (PARTITION BY four ORDER BY ten), ten, four FROM tenk1 WHERE unique2 < 10;
{code}
However, this one works:

{code:sql}
SELECT lag(ten, 2) OVER (PARTITION BY four ORDER BY ten), ten, four FROM tenk1 WHERE unique2 < 10;
{code}

In comparison, Postgres accepts a literal as a 2nd argument. I found this issue while porting `window.sql` tests from Postgres to Spark



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