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From Matthew McCline <>
Subject Re: ORC does not support type conversion from INT to STRING.
Date Mon, 18 Jul 2016 21:31:11 GMT

Hi Mahender,

Schema Evolution is available on the latest recent version of Hive.

For example, if you set hive.metastore.disallow.incompatible.col.type.changes=false;? on master
(i.e. hive2) it will support INT to STRING conversion.

If you need to remain on an older version, then you are out of luck.



From: Mahender Sarangam <>
Sent: Monday, July 18, 2016 1:59 PM
Subject: Re: ORC does not support type conversion from INT to STRING.

Hi Mich,

Sorry for delay in responding. here is the scenario,

We have created new cluster  and we have moved all ORC File data into new cluster. We have
re-created table pointing to ORC location. We have modified data type of ORC table from INT
to String. From then onward, we were unable to fire select statement against this ORC table,
hive keep throwing exception, "Orc table select. Unable to convert Int to String". Looks like
it is bug in ORC table only. Where in we modify the datatype from int to string, is causing
problem with ORC reading/select statement, it throws exceptio. Please let me know if there
are any workaround for this scenario. Is this behavior expected previously also.


On 6/14/2016 11:47 AM, Mich Talebzadeh wrote:
you must excuse my ignorance

can you please elaborate on this as there seems something has gone wrong somewhere?

Dr Mich Talebzadeh


On 14 June 2016 at 19:42, Mahender Sarangam <<>>

Yes Mich. We have restored cluster from metastore.

On 6/14/2016 11:35 AM, Mich Talebzadeh wrote:
Hi Mahendar,

Did you load the meta-data DB/schema from backup and now seeing this error

Dr Mich Talebzadeh


On 14 June 2016 at 19:04, Mahender Sarangam <<>>


On 6/13/2016 1:19 PM, Mahender Sarangam wrote:


We are facing issue while reading data from ORC table. We have created ORC table and dumped
data into it. We have deleted cluster due to some reason. When we recreated cluster (using
Metastore) and table pointing to same location. When we perform reading from ORC table. We
see below error.

SELECT col2, Col1,
  reflect("java.util.UUID", "randomUUID") AS ID,
 1     ,
FROM Table ORC  JOIN Table2 _surr;

ERROR : Vertex failed, vertexName=Map 1, vertexId=vertex_1465411930667_0212_1_01, diagnostics=[Task
failed, taskId=task_1465411930667_0212_1_01_000000, diagnostics=[TaskAttempt 0 failed, info=[Error:
Failure while running task:java.lang.RuntimeException: java.lang.RuntimeException: ORC does not support type conversion from INT to STRING.

I think issue is reflect("java.util.UUID", "randomUUID") AS ID

I know there is Bug raised while reading data from ORC table. Is there any workaround apart
from reloading data.


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