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https://issues.apache.org/jira/browse/HIVE-7657?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14096803#comment-14096803
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Arkadiusz Gasior commented on HIVE-7657:
----------------------------------------
Please add extra collection type to the union like:
{code}
custom_fields map<string, union<double, string,
array<union<bigint,double,string,boolean,int>>>>
{code}
> Map of union of 3 or more types cannot be joined
> ------------------------------------------------
>
> Key: HIVE-7657
> URL: https://issues.apache.org/jira/browse/HIVE-7657
> Project: Hive
> Issue Type: Bug
> Components: Serializers/Deserializers
> Reporter: Arkadiusz Gasior
> Assignee: Ashish Kumar Singh
> Labels: serde
>
> Joining table which contains map of union of 3 types or more is causing
> serialization issues.
> Given tables:
> ag_map_of_uniontype:
> {code}
> # col_name data_type comment
> hash string None
> custom_fields
> map<string,uniontype<bigint,double,string,boolean,int,array<uniontype<bigint,double,string,boolean,int>>,map<string,uniontype<bigint,double,string,boolean,int>>>>
> None
> {code}
> ag_simple_join_table:
> {code}
> # col_name data_type comment
> hash string None
> size int None
> {code}
> Query will throw java.lang.RuntimeException:
> {code}
> select
> i.hash,
> i.custom_fields,
> b.size
> from ag_map_of_uniontype i LEFT OUTER JOIN
> ag_simple_join_table b ON (i.hash = b.hash);
> {code}
> {code}
> org.apache.hadoop.hive.ql.exec.MapJoinOperator: Unxpected exception:
> java.util.ArrayList cannot be cast to
> org.apache.hadoop.hive.serde2.objectinspector.UnionObject
> java.lang.ClassCastException: java.util.ArrayList cannot be cast to
> org.apache.hadoop.hive.serde2.objectinspector.UnionObject
> at
> org.apache.hadoop.hive.serde2.objectinspector.StandardUnionObjectInspector.getTag(StandardUnionObjectInspector.java:91)
> at
> org.apache.hadoop.hive.serde2.lazy.LazySimpleSerDe.serialize(LazySimpleSerDe.java:559)
> at
> org.apache.hadoop.hive.serde2.lazy.LazySimpleSerDe.serialize(LazySimpleSerDe.java:529)
> at
> org.apache.hadoop.hive.serde2.lazy.LazySimpleSerDe.serializeField(LazySimpleSerDe.java:439)
> at
> org.apache.hadoop.hive.serde2.lazy.LazySimpleSerDe.serialize(LazySimpleSerDe.java:423)
> at
> org.apache.hadoop.hive.ql.exec.FileSinkOperator.processOp(FileSinkOperator.java:618)
> at org.apache.hadoop.hive.ql.exec.Operator.process(Operator.java:504)
> at org.apache.hadoop.hive.ql.exec.Operator.forward(Operator.java:847)
> at
> org.apache.hadoop.hive.ql.exec.SelectOperator.processOp(SelectOperator.java:87)
> at org.apache.hadoop.hive.ql.exec.Operator.process(Operator.java:504)
> at org.apache.hadoop.hive.ql.exec.Operator.forward(Operator.java:847)
> at
> org.apache.hadoop.hive.ql.exec.CommonJoinOperator.genAllOneUniqueJoinObject(CommonJoinOperator.java:671)
> at
> org.apache.hadoop.hive.ql.exec.CommonJoinOperator.checkAndGenObject(CommonJoinOperator.java:754)
> at
> org.apache.hadoop.hive.ql.exec.MapJoinOperator.processOp(MapJoinOperator.java:222)
> at org.apache.hadoop.hive.ql.exec.Operator.process(Operator.java:504)
> at org.apache.hadoop.hive.ql.exec.Operator.forward(Operator.java:847)
> at
> org.apache.hadoop.hive.ql.exec.TableScanOperator.processOp(TableScanOperator.java:91)
> at org.apache.hadoop.hive.ql.exec.Operator.process(Operator.java:504)
> at org.apache.hadoop.hive.ql.exec.Operator.forward(Operator.java:847)
> at
> org.apache.hadoop.hive.ql.exec.MapOperator.process(MapOperator.java:519)
> at org.apache.hadoop.hive.ql.exec.mr.ExecMapper.map(ExecMapper.java:157)
> at org.apache.hadoop.mapred.MapRunner.run(MapRunner.java:50)
> at org.apache.hadoop.mapred.MapTask.runOldMapper(MapTask.java:417)
> at org.apache.hadoop.mapred.MapTask.run(MapTask.java:332)
> at org.apache.hadoop.mapred.Child$4.run(Child.java:268)
> at java.security.AccessController.doPrivileged(Native Method)
> at javax.security.auth.Subject.doAs(Subject.java:415)
> at
> org.apache.hadoop.security.UserGroupInformation.doAs(UserGroupInformation.java:1554)
> at org.apache.hadoop.mapred.Child.main(Child.java:262)
> org.apache.hadoop.hive.ql.metadata.HiveException: Hive Runtime Error while
> processing row
> {"hash":"nzM2VsRBJReFrv4fGeSX","custom_fields":{"listOfIntegers":{5:[{4:10},{4:28},{4:42},{4:51},{4:63},{4:92},{4:113},{4:126},{4:128},{4:130},{4:144},{4:145},{4:146},{4:179},{4:182},{4:198},{4:225},{4:260},{4:232},{4:233},{4:237},{4:238},{4:255}]}}}
> {code}
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