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From "Tongjie Chen (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HIVE-6784) parquet-hive should allow column type change
Date Sat, 29 Mar 2014 02:26:14 GMT
Tongjie Chen created HIVE-6784:
----------------------------------

             Summary: parquet-hive should allow column type change
                 Key: HIVE-6784
                 URL: https://issues.apache.org/jira/browse/HIVE-6784
             Project: Hive
          Issue Type: Bug
          Components: File Formats, Serializers/Deserializers
    Affects Versions: 0.13.0
            Reporter: Tongjie Chen


see also in the following parquet issue:
https://github.com/Parquet/parquet-mr/issues/323

Currently, if we change parquet format hive table using "alter table parquet_table change
c1 c1 bigint " ( assuming original type of c1 is int), it will result in exception thrown
from SerDe: "org.apache.hadoop.io.IntWritable cannot be cast to org.apache.hadoop.io.LongWritable"
in query runtime.

This is different behavior from hive (using other file format), where it will try to perform
cast (null value in case of incompatible type).




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