Could you please look into and share your task log/attemptlog for complete
error trace or actual error behind this?
-Vivek
________________________________________
From: Søren [s...@syntonetic.com]
Sent: 04 December 2012 20:28
To: user@hive.apache.org
Subject: Re: handling null argument in custom udf
Thanks. Did you mean I should handle null in my udf or my serde?
I did try to check for null inside the code in my udf, but it fails even before
it gets called.
This is from when the udf fails:
....
Caused by: org.apache.hadoop.hive.ql.metadata.HiveException: Unable to execute
method public org.apache.hadoop.io.Text
com.company.hive.myfun.evaluate(java.lang.Object,java.lang.Object)
on objectcom.company.hive.myfun@1412332 of class com.company.hive.myfun with
arguments {0:java.lang.Object, null} of size 2
It looks like there is a null, or is this error message misleading?
On 04/12/2012 15:43, Edward Capriolo wrote:
There is no null argument. You should handle the null case in your code.
If (arga == null)
Or optionally you could use a generic udf but a regular one should handle what
you are doing.
On Tuesday, December 4, 2012, Søren
<s...@syntonetic.com<mailto:s...@syntonetic.com>> wrote:
> Hi Hive community
>
> I have a custom udf, say myfun, written in Java which I utilize like this
>
> select myfun(col_a, col_b) from mytable where ....etc
>
> col_b is a string type and sometimes it is null.
>
> When that happens, my query crashes with
> ---------------
> java.lang.RuntimeException: org.apache.hadoop.hive.ql.metadata.HiveException:
> Hive Runtime Error while processing row
> {"col_a":"val","col_b":null}
> ...
> Caused by: org.apache.hadoop.hive.ql.metadata.HiveException: Unable to
> execute method public org.apache.hadoop.io.Text
> ---------------
>
> public final class myfun extends UDF {
> public Text evaluate(final Text argA, final Text argB) {
>
> I'm unsure how this should be fixed in a proper way. Is the framework looking
> for an overload of evaluate that would comply with the null argument?
>
> I need to say that the table is declared using my own json serde reading from
> S3. I'm not processing nulls in my serde in any special way because Hive
> seems to handle null in the right way when not passed to my own UDF.
>
> Are there anyone out there with ideas or experiences on this issue?
>
> thanks in advance
> Søren
>
>
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