Pradeep Kamath reopened PIG-513:

Pig is supposed to provide nulls for columns not present in the data. For 
example if a file has 3 columns name, age gpa then the following statement 
should still work with the column 'extra' getting nulls:
a = load 'input' as (name, age, gpa, extra);

This is broken with the current code.

> PERFORMANCE: optimize some of the code in DefaultTuple
> ------------------------------------------------------
>                 Key: PIG-513
>                 URL: https://issues.apache.org/jira/browse/PIG-513
>             Project: Pig
>          Issue Type: Bug
>    Affects Versions: 0.2.0
>            Reporter: Pradeep Kamath
>            Assignee: Pradeep Kamath
>             Fix For: 0.6.0
>         Attachments: PIG-513.patch, pig-513_2.patch
> The following areas in DefaultTuple.java can be changed:
> The member methods get(), set(), getType() and isNull() all call 
> checkBounds() which is redundant call since all these 4 functions throw 
> ExecException. Instead of doing a bounds check, we can catch the 
> IndexOutOfBounds exception in a try-catch and throw it as an ExecException
> The write() method has the following unused object (d in the code below):
> {code}
> for (int i = 0; i < sz; i++) {
>                 try {
>                     Object d = get(i);
>                 } catch (ExecException ee) {
>                     throw new RuntimeException(ee);
>                 }
>                 DataReaderWriter.writeDatum(out, mFields.get(i));
>             }
> {code}
> {noformat}
> The get(i) call in the try should be replaced by the writeDatum call directly 
> since d is never used and there is an unncessary call to get()
> {noformat}

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