Github user JonZeolla commented on the issue:
https://github.com/apache/metron/pull/690
+1, visual inspection + a bit of playing around (see below).
```
~/bin$ ./stellar
SLF4J: Failed to load class "org.slf4j.impl.StaticLoggerBinder".
SLF4J: Defaulting to no-operation (NOP) logger implementation
SLF4J: See http://www.slf4j.org/codes.html#StaticLoggerBinder for further
details.
log4j:WARN No appenders could be found for logger
(org.apache.metron.stellar.beanutils.converters.BooleanConverter).
log4j:WARN Please initialize the log4j system properly.
log4j:WARN See http://logging.apache.org/log4j/1.2/faq.html#noconfig for
more info.
Stellar, Go!
Please note that functions are loading lazily in the background and will be
unavailable until loaded fully.
[Stellar]>>> Functions loaded, you may refer to functions now...
[Stellar]>>> TO_DOUBLE(2)
2.0
[Stellar]>>> TO_INTEGER(SQRT(64))
8
[Stellar]>>> TO_UPPER('ThIS is A TEsT of MetRoN-1091')
THIS IS A TEST OF METRON-1091
[Stellar]>>> CHOP('2093j0f29k30fk230f2j309jf')
2093j0f29k30fk230f2j309j
[Stellar]>>> COUNT_MATCHES('the quick brown fox jumped over the lazy dog',
'o')
4
[Stellar]>>> DAY_OF_YEAR(1502592512)
18
[Stellar]>>> DAY_OF_MONTH(1502592512)
18
~$ bin/stellar
SLF4J: Failed to load class "org.slf4j.impl.StaticLoggerBinder".
SLF4J: Defaulting to no-operation (NOP) logger implementation
SLF4J: See http://www.slf4j.org/codes.html#StaticLoggerBinder for further
details.
log4j:WARN No appenders could be found for logger
(org.apache.metron.stellar.beanutils.converters.BooleanConverter).
log4j:WARN Please initialize the log4j system properly.
log4j:WARN See http://logging.apache.org/log4j/1.2/faq.html#noconfig for
more info.
Stellar, Go!
Please note that functions are loading lazily in the background and will be
unavailable until loaded fully.
[Stellar]>>> Functions loaded, you may refer to functions now...
[Stellar]>>> DAY_OF_YEAR(1502592893)
18
[Stellar]>>> DAY_OF_MONTH(1502592893)
18
[Stellar]>>> COUNT_MATCHES('the quick brown fox jumped over the lazy dog',
'o')
4
```
Opened [METRON-1107](https://issues.apache.org/jira/browse/METRON-1107) for
the DAY_OF_{YEAR,MONTH} issue, otherwise looks good to me.
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