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https://issues.apache.org/jira/browse/HIVE-12619?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15063788#comment-15063788
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Mohammad Kamrul Islam commented on HIVE-12619:
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RB: https://reviews.apache.org/r/41541/
[~spena] please review it.
> Switching the field order within an array of structs causes the query to fail
> -----------------------------------------------------------------------------
>
> Key: HIVE-12619
> URL: https://issues.apache.org/jira/browse/HIVE-12619
> Project: Hive
> Issue Type: Bug
> Affects Versions: 1.1.0
> Reporter: Ang Zhang
> Assignee: Mohammad Kamrul Islam
> Priority: Minor
> Attachments: HIVE-12619.2.patch
>
>
> Switching the field order within an array of structs causes the query to fail
> or return the wrong data for the fields, but switching the field order within
> just a struct works.
> How to reproduce:
> Case1 if the two fields have the same type, query will return wrong data for
> the fields
> drop table if exists schema_test;
> create table schema_test (msg array<struct<f1: string, f2: string>>) stored
> as parquet;
> insert into table schema_test select stack(2, array(named_struct('f1', 'abc',
> 'f2', 'abc2')), array(named_struct('f1', 'efg', 'f2', 'efg2'))) from one
> limit 2;
> select * from schema_test;
> --returns
> --[{"f1":"efg","f2":"efg2"}]
> --[{"f1":"abc","f2":"abc2"}]
> alter table schema_test change msg msg array<struct<f2: string, f1: string>>;
> select * from schema_test;
> --returns
> --[{"f2":"efg","f1":"efg2"}]
> --[{"f2":"abc","f1":"abc2"}]
> Case2: if the two fields have different type, the query will fail
> drop table if exists schema_test;
> create table schema_test (msg array<struct<f1: string, f2: int>>) stored as
> parquet;
> insert into table schema_test select stack(2, array(named_struct('f1', 'abc',
> 'f2', 1)), array(named_struct('f1', 'efg', 'f2', 2))) from one limit 2;
> select * from schema_test;
> --returns
> --[{"f1":"efg","f2":2}]
> --[{"f1":"abc","f2":1}]
> alter table schema_test change msg msg array<struct<f2: int, f1: string>>;
> select * from schema_test;
> Failed with exception
> java.io.IOException:org.apache.hadoop.hive.ql.metadata.HiveException:
> java.lang.ClassCastException: org.apache.hadoop.io.Text cannot be cast to
> org.apache.hadoop.io.IntWritable
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