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https://issues.apache.org/jira/browse/HIVE-11712?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14726417#comment-14726417
]
Jimmy Xiang commented on HIVE-11712:
------------------------------------
Because of the distinct, the s1.customer_name is kind of the duplicated groupby
keys. It runs into the same error if using "group by s1.customer_name,
s1.customer_name" instead.
> 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
> Fix For: 1.3.0, 2.0.0
>
> Attachments: HIVE-11712.1.patch
>
>
> 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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