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

• Type: Bug
• Status: Resolved
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 0.13.0
• Component/s: File Formats, Serializers/Deserializers
• Assignee: Unassigned
• Reporter: Tongjie Chen
• Created: 31/Mar/14 19:12
• Updated: 31/Mar/14 21:29
• Resolved: 31/Mar/14 21:29

Description

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.

Issue Links

• duplicates: HIVE-6575 select * fails on parquet table with map datatype