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Hive, mail # user - Re: getStructFieldData method on StructObjectInspector


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Re: getStructFieldData method on StructObjectInspector
kulkarni.swarnim@...) 2012-05-29, 15:08
If someone can help understand this, I would really appreciate.

On Fri, May 25, 2012 at 3:58 PM, [EMAIL PROTECTED] <
[EMAIL PROTECTED]> wrote:

> I am trying to write a custom ObjectInspector extending the
> StructObjectInspector and got a little confused about the use of the
> getStructFieldData method on the inspector. Looking at the definition of
> the method:
>
> public Object getStructFieldData(Object data, StructField fieldRef);
>
> I understand that the use of this method is to retrieve the specific given
> field from the buffer. However, what I don't understand is what is it
> expected to return. I looked around the tests and related code and mostly
> stuff returned was either a LazyPrimitive or a LazyNonPrimitive, but I
> couldn't find anything that enforces this(specially given that the return
> type is a plain "Object")! Does this mean that I am free to return even my
> custom object as a return type of this method? If so, what is the guarantee
> that it will be interpreted correctly down the pipeline?
>
> Thanks,
> --
> Swarnim
>

--
Swarnim