Hive Null comparison not works properly

[#1]

Hi,

I have below Hive query and its not giving me "equals" as output. Why?

hive> select case when (NULL=NULL) then "equals" else "not equals" end as value;
OK
not equals

[#2]

@Gnanasekaran G

check NULL is NULL instead of NULL = NULL. This worked for me.

[#3 · Accepted solution]

@Gnanasekaran G Use the following ( <=>) operator instead of (=) operator

SELECT CASE WHEN (NULL<=>NULL) THEN "equals" ELSE "not equals" end AS value;

Reference:

https://cwiki.apache.org/confluence/display/Hive/LanguageManual+UDF#LanguageManualUDF-RelationalOper...

[#4]

@Gnanasekaran G if this helped, please vote/accept best answer. we can close the thread

[#5]

Thank you @Murali Ramasami @Sharmadha Sainath . It works for me now.

[#6]

Thanks @Gnanasekaran G please accept best answer. we can close the thread