My bad, yes of course that! still i don't like the ..
select("count(myCol)") .. part in my line is there any replacement to that ?
Le ven. 8 avr. 2022 à 06:13, Sean Owen <sro...@gmail.com> a écrit :
> Just do an average then? Most of my point is that filtering to one group
> and then grouping is pointless.
>
> On Thu, Apr 7, 2022, 11:10 PM sam smith <qustacksm2123...@gmail.com>
> wrote:
>
>> What if i do avg instead of count?
>>
>> Le ven. 8 avr. 2022 à 05:32, Sean Owen <sro...@gmail.com> a écrit :
>>
>>> Wait, why groupBy at all? After the filter only rows with myCol equal to
>>> your target are left. There is only one group. Don't group just count after
>>> the filter?
>>>
>>> On Thu, Apr 7, 2022, 10:27 PM sam smith <qustacksm2123...@gmail.com>
>>> wrote:
>>>
>>>> I want to aggregate a column by counting the number of rows having the
>>>> value "myTargetValue" and return the result
>>>> I am doing it like the following:in JAVA
>>>>
>>>>> long result =
>>>>> dataset.filter(dataset.col("myCol").equalTo("myTargetVal")).groupBy(col("myCol")).agg(count(dataset.col("myCol"))).select("count(myCol)").first().getLong(0);
>>>>
>>>>
>>>> Is that the right way? if no, what if a more optimized way to do that
>>>> (always in JAVA)?
>>>> Thanks for the help.
>>>>
>>>
