ContextualEvalFunc

[John Smith <le...@gmail.com>]

Hello,

is there any documentation how can I use ContextualEvalFunc? My intention
is to precompute output schema and pass those information - ideally one
JSON string/file from the fronted into the backend, then I can generate
code inside outputSchema method.

https://github.com/apache/incubator-datafu/blob/master/datafu-pig/src/main/java/datafu
/pig/util/ContextualEvalFunc.java


Thank you

Best,
 John

Re: ContextualEvalFunc

[Matthew Hayes <ma...@gmail.com>]

No other documentation other than what's in the javadoc, however you could
look at the rest of the DataFu code for examples of its use, which should
give you the general idea, like:

https://github.com/apache/incubator-datafu/blob/master/datafu-pig/src/main/java/datafu/pig/bags/EmptyBagToNullFields.java

-Matt

On Thu, Dec 17, 2015 at 12:47 PM, John Smith <le...@gmail.com> wrote:

> Hello,
>
> is there any documentation how can I use ContextualEvalFunc? My intention
> is to precompute output schema and pass those information - ideally one
> JSON string/file from the fronted into the backend, then I can generate
> code inside outputSchema method.
>
>
> https://github.com/apache/incubator-datafu/blob/master/datafu-pig/src/main/java/datafu
> /pig/util/ContextualEvalFunc.java
>
>
> Thank you
>
> Best,
>  John
>