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From "Arvind Prabhakar (JIRA)" <j...@apache.org>
Subject [jira] Created: (HIVE-1287) Struct datatype should not use field names for type equivalence.
Date Mon, 29 Mar 2010 18:56:27 GMT
Struct datatype should not use field names for type equivalence.
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                 Key: HIVE-1287
                 URL: https://issues.apache.org/jira/browse/HIVE-1287
             Project: Hadoop Hive
          Issue Type: Bug
          Components: Query Processor
         Environment: Mac OS X (10.6.2) Java SE 6 ( 1.6.0_17)
            Reporter: Arvind Prabhakar


The field names for {{Struct}} types are currently being matched for testing type equivalence.
This is readily seen by running the following example:

{noformat}

hive> create table source ( foo struct < x : string > );
OK
Time taken: 3.094 seconds

hive> load data local inpath '/path/to/sample/data.txt' overwrite into table source;
Copying data from file:/path/to/sample/data.txt
Loading data to table source
OK
Time taken: 0.593 seconds

hive> create table sink ( bar struct < y : string >);
OK
Time taken: 0.11 seconds

hive> insert overwrite table sink select foo from source;
FAILED: Error in semantic analysis: line 1:23 Cannot insert into target table 
because column number/types are different sink: Cannot convert column 0 
from struct<x:string> to struct<y:string>.

{noformat}

Since both {{soruce.foo}} and {{sink.bar}} are similar in definition with only field names
being different, data movement between these two should be allowed. 



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