[HIVE-18211] Support to read multiple level definition for Map type in Parquet file

• Type: Sub-task
• Status: Closed
• Priority: Major
• Resolution: Fixed
• Fix Version/s: 3.0.0
• Assignee: Colin
• Reporter: Colin
• Created: 04/Dec/17 06:56
• Updated: 22/May/18 23:13
• Resolved: 18/Dec/17 01:56

Description

For the current implementation with VectorizedParquetRecordReader, only following definition for map type is supported:

repeated group map (MAP_KEY_VALUE) {
    required binary key (UTF8); optional binary value (UTF8);}
}

The implementation should support multiple level definition like:

optional group m1 (MAP) {
    repeated group map (MAP_KEY_VALUE)
        {required binary key (UTF8); optional binary value (UTF8);}
}

Issue Links

• relates to: HIVE-8909 Hive doesn't correctly read Parquet nested types
• links to: Review board