Alexander Behm created IMPALA-6627:

             Summary: Document Hive-incompatible behavior with the 
serialization.null.format table property
                 Key: IMPALA-6627
             Project: IMPALA
          Issue Type: Improvement
          Components: Docs
            Reporter: Alexander Behm
            Assignee: Alex Rodoni

Impala only respects the "serialization.null.format" table property for TEXT 
tables and ignores it for Parquet and other formats.

Hive respects the "serialization.null.format" property even for other formats, 
converting matching values to NULL during the scan.

There's is a separate discussion to be had about which behavior makes more 
sense, but let's document this as an incompatibility for now since it has come 
up several times already.

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