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Hive, mail # user - Use Hive reflect() method to call non-static JDK fuctions


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Use Hive reflect() method to call non-static JDK fuctions
David Lee 2013-03-19, 00:00
It's relatively straight forward to call static functions in JDK using
reflect.  For example,

select reflect("java.lang.Math", "max", 2, 3) from mytable limit 1;

However,  how do I use reflect to call non-static functions (e.g.,
indexOf() method in java.lang.String class)?
None of the following usage of reflect is correct.  Assuming that mytable
has column called text.

select text, reflect('java.lang.String', 'indexOf', 'school
today'), reflect('java.lang.String', 'indexOf', text, 'school
today'), reflect('java.lang.String', 'indexOf', 'school today', text)
from mytable
limit 1;
+
Navis류승우 2013-03-19, 00:21