Haitao Yao created PIG-2828:
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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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