Ang Zhang created HIVE-12619:
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Summary: 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
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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