Github user sergiobilello-eb commented on the issue:
https://github.com/apache/spark/pull/18134
```spark-sql> select dayofweek('2007-02-03'), dayofweek('2009-07-30'),
dayofweek('2017-05-27'), dayofweek(null), dayofweek('1582-10-15 13:10:15');
17/11/10 16:08:23 INFO SparkSqlParser: Parsing command: select
dayofweek('2007-02-03'), dayofweek('2009-07-30'), dayofweek('2017-05-27'),
dayofweek(null), dayofweek('1582-10-15 13:10:15')
17/11/10 16:08:23 INFO HiveMetaStore: 0: get_database: default
17/11/10 16:08:23 INFO audit: ugi=sergio.bilello ip=unknown-ip-addr
cmd=get_database: default
17/11/10 16:08:23 INFO HiveMetaStore: 0: get_database: default
17/11/10 16:08:23 INFO audit: ugi=sergio.bilello ip=unknown-ip-addr
cmd=get_database: default
17/11/10 16:08:23 INFO HiveMetaStore: 0: get_function: default.dayofweek
17/11/10 16:08:23 INFO audit: ugi=sergio.bilello ip=unknown-ip-addr
cmd=get_function: default.dayofweek
Error in query: Undefined function: 'dayofweek'. This function is neither a
registered temporary function nor a permanent function registered in the
database 'default'.; line 1 pos 7```
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