16beta2 SQL parser: different defaults on absent_on_null

[Martin Butter]

While adapting a Java implementation of the SQL parser, I noticed that 
in structures JsonArrayAgg, JsonArrayConstructor, 
JsonArrayQueryConstructor and JsonObjectConstrutor, the absent_on_null 
field defaults to TRUE.
But in JsonObjectAgg, absent_on_null defaults to FALSE.
Is that intentionally?
Regards,
Martin.