Semantics of * is not consistent
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                 Key: PIG-664
                 URL: https://issues.apache.org/jira/browse/PIG-664
             Project: Pig
          Issue Type: Bug
          Components: impl
    Affects Versions: types_branch
            Reporter: Santhosh Srinivasan
            Assignee: Santhosh Srinivasan
             Fix For: types_branch


The semantics of * is not consistent in PIG. The use of * with generate results 
in the all the columns of the record being flattened. However, the use of * as 
an input to a UDF results in a tuple (wrapped in another tuple). For 
consistency, * should always result in all the columns of the record (i.e., 
flattened). The use of * occurs in:

1. Foreach generate: E.g.: foreach input generate *;
2. Input to UDFs: E.g. foreach input generate myUDF(*);
3. Order by: E.g.: order input by *;
4. (Co)Group: E.g.: group a by *; cogroup a by *, b by *;

In terms of implementation, this involves rolling back the fix introduced in 
PIG-597 and fixing the following builtin UDFs:

1. ARITY - Should return the size of the input tuple instead of extracting the 
first column of the input tuple
2. SIZE - Should return the size of the input tuple instead of extracting the 
first column of the input tuple

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