>>> spark.sql("SELECT sentences('Hi there! Good morning.') AS result").show(truncate=False)
+...
|result...|
+...
|[[Hi, there], [Good, morning]]...|
+...
<BLANKLINE>

>>> spark.sql("SELECT sentences('Hello world') AS result").show(truncate=False)
+...
|result...|
+...
|[[Hello, world]]...|
+...
<BLANKLINE>

>>> spark.sql("SELECT sentences('What? Yes! OK.') AS result").show(truncate=False)
+...
|result...|
+...
|[[What], [Yes], [OK]]...|
+...
<BLANKLINE>

>>> spark.sql("SELECT sentences(NULL) AS result").show(truncate=False)
+------+
|result|
+------+
|NULL  |
+------+
<BLANKLINE>

>>> spark.sql("SELECT sentences('') AS result").show(truncate=False)
+------+
|result|
+------+
|[]    |
+------+
<BLANKLINE>

>>> spark.sql("SELECT sentences('Hi there!', 'en') AS result").show(truncate=False)
+...
|result...|
+...
|[[Hi, there]]...|
+...
<BLANKLINE>

>>> spark.sql("SELECT sentences('Hi there!', 'en', 'US') AS result").show(truncate=False)
+...
|result...|
+...
|[[Hi, there]]...|
+...
<BLANKLINE>
