LazyArray.getList changes array it previously returned
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Key: HIVE-2939
URL: https://issues.apache.org/jira/browse/HIVE-2939
Project: Hive
Issue Type: Bug
Components: UDF
Affects Versions: 0.8.1
Reporter: Igor Kabiljo
Simple query like:
SELECT a, e
FROM ikabiljo_test_string_array
LATERAL VIEW EXPLODE(a) x1 AS e
(table contains one column - ARRAY<STRING> - and has one row - [b,c,a] )
fails with ConcurrentModificationException, since LazyArray.getList changes the
cached array it returns.
LazyArray.getList can easily:
- return cached array if present, without clearing and refiling. Hive is
already not going to work properly if you change input parameters in an UDF. If
that doesn't sound good - it can return Collections.unmodifiableList
- or just not cache anything
Same is true for LazyMap.getMap
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