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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