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From "Chaoyu Tang (JIRA)" <>
Subject [jira] [Created] (HIVE-5320) Querying a table with nested struct type over JSON data results in errors
Date Thu, 19 Sep 2013 13:39:52 GMT
Chaoyu Tang created HIVE-5320:

             Summary: Querying a table with nested struct type over JSON data results in errors
                 Key: HIVE-5320
             Project: Hive
          Issue Type: Bug
          Components: Serializers/Deserializers
    Affects Versions: 0.9.0
            Reporter: Chaoyu Tang

Querying a table with nested_struct datatype like
create table nest_struct_tbl (col1 string, col2 array<struct<a1:string, a2:array<struct<b1:int,
b2:string, b3:string>>>>) ROW FORMAT SERDE '';

over JSON data cause errors including java.lang.IndexOutOfBoundsException or corrupted data.

The JsonSerDe used is json-serde-1.1.4.jar/json-serde-1.1.4-jar-dependencies.jar.

The cause is that the method:
public List<Object> getStructFieldsDataAsList(Object o) 
returns a list referencing to a static arraylist "values"
So the local variable 'list' in method serialize of Hive LazySimpleSerDe class is returned
with same reference in its recursive calls and its element values are kept on being overwritten
in the case STRUCT.

1. Fix in JsonSerDe, and change the field 'values' in
to instance scope.
Filed a ticket to JSonSerDe (
2. Ideally, in the method serialize of class LazySimpleSerDe, we should defensively save a
copy of a list resulted from list = soi.getStructFieldsDataAsList(obj) in which case the soi
is the instance of JsonStructObjectInspector, so that the recursive calls of serialize can
work properly regardless of the extended SerDe implementation.

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