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https://issues.apache.org/jira/browse/HIVE-1388?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12875388#action_12875388
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Ning Zhang commented on HIVE-1388:
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+1. will commit if tests pass.
> combinehiveinputformat does not work if files are of different types
> --------------------------------------------------------------------
>
> Key: HIVE-1388
> URL: https://issues.apache.org/jira/browse/HIVE-1388
> Project: Hadoop Hive
> Issue Type: Bug
> Components: Query Processor
> Reporter: Namit Jain
> Assignee: Namit Jain
> Attachments: hive.1388.1.patch, hive.1388.2.patch
>
>
> rop table t1;
> drop table t2;
> create table t1 (key string, value string) partitioned by (ds string, hr
> string);
> create table t2 (key string, value string) partitioned by (ds string);
> insert overwrite table t1 partition (ds='1', hr='1') select key, value from
> src cluster by key;
> insert overwrite table t1 partition (ds='1', hr='2') select key, value from
> src cluster by key;
> insert overwrite table t1 partition (ds='1', hr='2') select key, value from
> t1 where ds = '1' and hr = '2';
> desc extended t1;
> desc extended t1 partition (ds='1', hr='1');
> desc extended t1 partition (ds='1', hr='2');
> alter table t2 add partition (ds='1') location
> '/data/users/njain/hive3/hive3/build/ql/test/data/warehouse/t1/ds=1';
> select count(1) from t2 where ds='1';
> set hive.input.format = org.apache.hadoop.hive.ql.io.CombineHiveInputFormat;
> select count(1) from t2 where ds='1';
> drop table t1;
> drop table t2;
> Consider the above testcase, some files are generated by mappers, whereas
> some others are generated by reducers.
> It is therefore possible that some files contain Text in their key, whereas
> others contain BytesWritable.
> Due to that, combinehiveInputFormat record reader may get an error.
> Note that, this works in hiveinputformat because different files are not
> combined in the same mapper - it even works if
> we query 't1' because different partitions are not combined in the same mapper
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