hadoop - percentile_approx in hive returning zero -

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i have been trying check percentile_approx set of users. intention behind top 25% of customers in data set. so, in order check that, ran following hive query.

select percentile_approx(amount, 0.75) sales

however, value returned query 0.0. not sure problem is. when run query on sample of few records result expected.

can please shed light on this?

note - trying find percentile in data set containing more 3.3 m records.

generally percentile_approx() works on integer type data. please make sure have applied on column has integers.


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