Deleting a Field Without Knowing Incoming Fields

[Wallace Mann]

How do I delete one field without knowing at compile time what the
incoming fields are?

The example in the users guide presumes knowledge of the keep fields:

// incoming -> "keepField", "dropField"
pipe = new Each( pipe, new Fields( "keepField" ), new Identity(),
Fields.RESULTS );
// outgoing -> "keepField"

What I'm looking for is something like ...

pipe = new Delete( pipe, new Fields( "deleteMe" ) );

What I'm really looking for is a version of Rename that won't blow up
if the toField already exists. This is my current solution, which
works but sends junk data through the system until the next
Aggregation.

String junkFieldName = "IGNORE_FIELD_" + new
Date().getTime();
pipe = new Rename( pipe, new Fields( toFieldName ), new
Fields( junkFieldName) );
pipe = new Rename( pipe, new Fields( fromFieldName ), new
Fields( toFieldName) );


Thanks,
Wallace

[Chris K Wensel]

try Discard
http://docs.cascading.org/cascading/2.0/javadoc/cascading/pipe/assembly/Discard.html

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Chris K Wensel
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[Wallace Mann]

Ack! I went looking in the javadocs for Discard, Delete, Dispose,
Remove ... and now notice that although I'm using 2.0 code, I was
searching 1.1 javadocs.

Thanks again!
Wallace

On Apr 26, 1:30 pm, Chris K Wensel <ch...@wensel.net> wrote:
> try Discardhttp://docs.cascading.org/cascading/2.0/javadoc/cascading/pipe/assemb...

> > For more options, visit this group athttp://groups.google.com/group/cascading-user?hl=en.