Erik Jansen created SPARK-39247:
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Summary: Support returning a table or set of rows in CREATE
FUNCTION
Key: SPARK-39247
URL: https://issues.apache.org/jira/browse/SPARK-39247
Project: Spark
Issue Type: New Feature
Components: SQL
Affects Versions: 3.3.0
Reporter: Erik Jansen
The Databricks version supports create a function which returns a result set:
_"Creates a SQL scalar or table function that takes a set of arguments and
returns a scalar value or a set of rows."_
Such functions are very useful as the user can pass a list of parameters which
can be used in the function to create a dynamic result set (a query which will
use the passed parameters).
See the example from databricks:
{_}"{_}{_}-- Produce all weekdays between two dates > CREATE FUNCTION
weekdays(start DATE, end DATE) RETURNS TABLE(day_of_week STRING, day DATE)
RETURN SELECT extract(DAYOFWEEK_ISO FROM day), day FROM (SELECT
sequence(weekdays.start, weekdays.end)) AS T(days) LATERAL VIEW explode(days)
AS day WHERE extract(DAYOFWEEK_ISO FROM day) BETWEEN 1 AND 5;"{_}
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