Eric Chu created HIVE-5623:
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Summary: ORC accessing array column that's empty will fail with
java out of bound exception
Key: HIVE-5623
URL: https://issues.apache.org/jira/browse/HIVE-5623
Project: Hive
Issue Type: Bug
Components: File Formats
Affects Versions: 0.11.0
Reporter: Eric Chu
Priority: Critical
In our ORC tests we saw that queries that work on RCFile failed on the
corresponding ORC version with Java IndexOutOfBoundsException in
OrcStruct.java. The queries failed b/c the table has an array type column and
there are rows with an empty array. We noticed that the getList(Object list,
int i) method in OrcStruct.java simply returns the i-th element from list
without checking if list is not null or if i is within valid range. After
fixing that the queries run fine. The fix is really simple, but maybe there are
other similar cases that need to be handled.
The fix is to check if listObj is null and if i falls within range:
public Object getListElement(Object listObj, int i) {
if (listObj == null) {
return null;
}
List list = ((List) listObj);
if (i < 0 || i >= list.size()) {
return null;
}
return list.get(i);
}
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