java/pig-galago/src/com/yahoo/pig/builtin/EFArity.java

   1 /*
   2  * Copyright (c) 2007 Yahoo! Inc.  All rights reserved.
   3  * See accompanying LICENSE file.
   4  */
   5 package com.yahoo.pig.builtin;
   6
   7 import java.io.IOException;
   8
   9 import com.yahoo.pig.AtomEvalFunc;
  10 import com.yahoo.pig.data.*;
  11 import com.yahoo.pig.impl.logicalLayer.schema.SchemaField;
  12 import com.yahoo.pig.impl.logicalLayer.schema.SchemaItem;
  13 import com.yahoo.pig.impl.logicalLayer.schema.SchemaItemList;
  14
  15 public class EFArity extends AtomEvalFunc {
  16
  17     @Override
  18     public void exec(Tuple input, DataAtom output) throws IOException {
  19         output.setValue(input.arity());
  20     }
  21     @Override
  22     public SchemaItem outputSchema() {
  23         SchemaItemList schema = new SchemaItemList();
  24         schema.add(new SchemaField("arity"));
  25         return schema;
  26     }
  27 }