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From "Haitao Yao (JIRA)" <j...@apache.org>
Subject [jira] [Created] (PIG-2828) DataType.compare null
Date Thu, 19 Jul 2012 10:03:35 GMT
Haitao Yao created PIG-2828:
-------------------------------

             Summary: DataType.compare null
                 Key: PIG-2828
                 URL: https://issues.apache.org/jira/browse/PIG-2828
             Project: Pig
          Issue Type: Bug
    Affects Versions: 0.9.2
            Reporter: Haitao Yao


While using TOP, and if the DataBag contains null value to compare, it will generate the following
exception:

Caused by: java.lang.NullPointerException
	at org.apache.pig.data.DataType.compare(DataType.java:427)
	at org.apache.pig.builtin.TOP$TupleComparator.compare(TOP.java:97)
	at org.apache.pig.builtin.TOP$TupleComparator.compare(TOP.java:1)
	at java.util.PriorityQueue.siftUpUsingComparator(PriorityQueue.java:649)
	at java.util.PriorityQueue.siftUp(PriorityQueue.java:627)
	at java.util.PriorityQueue.offer(PriorityQueue.java:329)
	at java.util.PriorityQueue.add(PriorityQueue.java:306)
	at org.apache.pig.builtin.TOP.updateTop(TOP.java:141)
	at org.apache.pig.builtin.TOP.exec(TOP.java:116)


code: (TOP.java, starts with line 91)
                Object field1 = o1.get(fieldNum);
                Object field2 = o2.get(fieldNum);
                if (!typeFound) {
                    datatype = DataType.findType(field1);
                    typeFound = true;
                }
                return DataType.compare(field1, field2, datatype, datatype);

The reason is that if the typeFound is true , and the dataType is not null, and field1 is
null, the script failed.
So we need to judge the field1 whether is null.


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