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Pig >> mail # user >> reference tuple field by name in UDF


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Dexin Wang 2013-01-15, 22:15
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Re: reference tuple field by name in UDF
Another way to do it would be to make a helper function that does the
following:

input.get(getInputSchema().getPosition(alias));

Only available in 0.10 and later (I think getInputSchema is in 0.10, at
least...may only be in 0.11)
2013/1/15 Dexin Wang <[EMAIL PROTECTED]>

> Hi,
>
> In my own UDF, is reference a field by index the only way to access a
> field?
>
> The fields are all named and typed before passing into UDF but looks like I
> can only do something like this:
>
>        String v1 = (String)input.get(0);
>        String v2 = (String)input.get(1);
>        String v3 = (String)input.get(2);
>
> instead I'd like to do something like this:
>
>       String v1 = (String)input.get("f1");
>       String v2 = (String)input.get("f2");
>       String v3 = (String)input.get("f3");
>
> since I have lots of field and I don't want to tie myself up the
> positioning of the fields.
>
> Any alternative? Thanks.
>
> Dexin
>
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Dexin Wang 2013-02-01, 22:45
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Jonathan Coveney 2013-02-03, 06:03