[jira] [Created] (HIVE-6794) select * from parquet hive table containing map columns runs into exception

[Tongjie Chen (JIRA)]

Tongjie Chen created HIVE-6794:
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             Summary: select * from parquet hive table containing map columns 
runs into exception
                 Key: HIVE-6794
                 URL: https://issues.apache.org/jira/browse/HIVE-6794
             Project: Hive
          Issue Type: Bug
          Components: File Formats, Serializers/Deserializers
    Affects Versions: 0.13.0
            Reporter: Tongjie Chen


select * from parquet hive table containing map columns run into exception 
"FAILED: RuntimeException java.lang.ClassCastException: 
parquet.hive.serde.DeepParquetHiveMapInspector cannot be cast to 
parquet.hive.serde.StandardParquetHiveMapInspector"

To reproduce, use the following steps (both regular_map_table and 
parquet_map_table contains schema "c1 , c2 int"):

hive> insert overwrite table parquet_map_table select * from regular_map_table;
hive> select * from parquet_map_table; (the first query to select * works fine )

OK
{"key1":"value1"} 1
{"key2":"value2"} 2
{"key3":"value3"} 3
Time taken: 2.669 seconds, Fetched: 3 row(s)
hive> select * from parquet_map_table; (the second and all subsequent exact 
same query breaks)

FAILED: RuntimeException java.lang.ClassCastException: 
parquet.hive.serde.DeepParquetHiveMapInspector cannot be cast to 
parquet.hive.serde.StandardParquetHiveMapInspector

Interestingly "select c1 from parquet_map_column" query works fine though.



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