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From "justin coffey" <j.cof...@criteo.com>
Subject Re: Review Request 18925: HIVE-6575 select * fails on parquet table with map datatype
Date Mon, 10 Mar 2014 15:16:46 GMT

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This is an automatically generated e-mail. To reply, visit:
https://reviews.apache.org/r/18925/#review36644
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Ship it!


go for r3 with the getClass (and no instanceof) check and {} formatting.

- justin coffey


On March 8, 2014, 12:01 a.m., Szehon Ho wrote:
> 
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> This is an automatically generated e-mail. To reply, visit:
> https://reviews.apache.org/r/18925/
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> 
> (Updated March 8, 2014, 12:01 a.m.)
> 
> 
> Review request for hive, Brock Noland, justin coffey, and Xuefu Zhang.
> 
> 
> Repository: hive-git
> 
> 
> Description
> -------
> 
> The issue is, as part of select * query, a DeepParquetHiveMapInspector is used for one
column of an overall parquet-table struct object inspector.  
> 
> The problem lies in the ObjectInspectorFactory's cache for struct object inspector. 
For performance, there is a cache keyed on an array list, of all object inspectors of columns.
 The second time the query is run, it attempts to lookup cached struct inspector.  But when
the hashmap looks up the part of the key consisting of the DeepParquetHiveMapInspector, java
calls .equals against the existing DeepParquetHivemapInspector.  This fails, as the .equals
method casted the "other" to a "StandardParquetHiveInspector".
> 
> Regenerating the .equals and .hashcode from eclipse.  
> 
> Also adding one more check in .equals before casting, to handle the case if another class
of object inspector gets hashed to the same hashcode in the cache.  Then java would call .equals
against the other, which in this case is not of the same class.
> 
> 
> Diffs
> -----
> 
>   ql/src/java/org/apache/hadoop/hive/ql/io/parquet/serde/AbstractParquetMapInspector.java
1d72747 
> 
> Diff: https://reviews.apache.org/r/18925/diff/
> 
> 
> Testing
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> 
> Manual testing.
> 
> 
> Thanks,
> 
> Szehon Ho
> 
>


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