[jira] [Created] (HIVE-11712) Duplicate groupby keys cause ClassCastException

["Jimmy Xiang (JIRA)" <ji...@apache.org>]

Jimmy Xiang created HIVE-11712:
----------------------------------

             Summary: Duplicate groupby keys cause ClassCastException
                 Key: HIVE-11712
                 URL: https://issues.apache.org/jira/browse/HIVE-11712
             Project: Hive
          Issue Type: Bug
            Reporter: Jimmy Xiang
            Assignee: Jimmy Xiang


With duplicate groupby keys, we could use wrong object inspectors for some groupby expressions, and lead to ClassCastException, for example, 

{noformat}
explain
SELECT distinct s1.customer_name as x, s1.customer_name as y
FROM default.testv1_staples s1 join default.src s2 on s1.customer_name = s2.key
HAVING (
(SUM(s1.customer_balance) <= 4074689.000000041)
AND (AVG(s1.discount) <= 822)
AND (COUNT(s2.value) > 4)
{noformat}

will lead to

{noformat}
Caused by: java.lang.ClassCastException: org.apache.hadoop.hive.serde2.objectinspector.primitive.WritableShortObjectInspector cannot be cast to org.apache.hadoop.hive.serde2.objectinspector.StructObjectInspector
	at org.apache.hadoop.hive.ql.udf.generic.GenericUDAFAverage$AbstractGenericUDAFAverageEvaluator.init(GenericUDAFAverage.java:374)
	at org.apache.hadoop.hive.ql.parse.SemanticAnalyzer.getGenericUDAFInfo(SemanticAnalyzer.java:3887)
	at org.apache.hadoop.hive.ql.parse.SemanticAnalyzer.genGroupByPlanGroupByOperator1(SemanticAnalyzer.java:4354)
	at org.apache.hadoop.hive.ql.parse.SemanticAnalyzer.genGroupByPlanMapAggrNoSkew(SemanticAnalyzer.java:5644)
	at org.apache.hadoop.hive.ql.parse.SemanticAnalyzer.genBodyPlan(SemanticAnalyzer.java:8977)
	at org.apache.hadoop.hive.ql.parse.SemanticAnalyzer.genPlan(SemanticAnalyzer.java:9849)
	at org.apache.hadoop.hive.ql.parse.SemanticAnalyzer.genPlan(SemanticAnalyzer.java:9742)
	at org.apache.hadoop.hive.ql.parse.SemanticAnalyzer.genOPTree(SemanticAnalyzer.java:10178)
	at org.apache.hadoop.hive.ql.parse.SemanticAnalyzer.analyzeInternal(SemanticAnalyzer.java:10189)
	at org.apache.hadoop.hive.ql.parse.SemanticAnalyzer.analyzeInternal(SemanticAnalyzer.java:10106)
	at org.apache.hadoop.hive.ql.parse.BaseSemanticAnalyzer.analyze(BaseSemanticAnalyzer.java:222)
{noformat}



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