Github user gatorsmile commented on the issue:
https://github.com/apache/spark/pull/18134
@sergiobilello-eb This is just a SQL function. You can call it in SQL
interface or using the `df.select(expr("dayofweek('2009-07-30')"))`. It is not
part of the DataFrame functions. You can submit a PR or report it as an issue
to add such an API.
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