Simple UDAFs with more than 1 parameter crash on empty row query
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Key: HIVE-1376
URL: https://issues.apache.org/jira/browse/HIVE-1376
Project: Hadoop Hive
Issue Type: Bug
Components: Query Processor
Affects Versions: 0.6.0
Reporter: Mayank Lahiri
Fix For: 0.6.0
Simple UDAFs with more than 1 parameter crash when the query returns no rows.
Currently, this only seems to affect the percentile() UDAF where the second
parameter is the percentile to be computed (of type double). I've also verified
the bug by adding a dummy parameter to ExampleMin in contrib.
On an empty query, Hive seems to be trying to resolve an iterate() method with
signature {null,null} instead of {null,double}. You can reproduce this bug
using:
CREATE TABLE pct_test ( val INT );
SELECT percentile(val, 0.5) FROM pct_test;
which produces a lot of errors like:
Caused by: org.apache.hadoop.hive.ql.metadata.HiveException: Unable to execute
method public boolean
org.apache.hadoop.hive.ql.udf.UDAFPercentile$PercentileLongEvaluator.iterate(org.apache.hadoop.io.LongWritable,double)
on object
org.apache.hadoop.hive.ql.udf.udafpercentile$percentilelongevalua...@11d13272
of class org.apache.hadoop.hive.ql.udf.UDAFPercentile$PercentileLongEvaluator
with arguments {null, null} of size 2
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