public Short getNullable() {
    // All Hive types are nullable
    return DatabaseMetaData.typeNullable;
  }
Can you use NULL for this type?
@return
DatabaseMetaData.typeNoNulls - does not allow NULL values
DatabaseMetaData.typeNullable - allows NULL values
DatabaseMetaData.typeNullableUnknown - nullability unknown
serde/src/java/org/apache/hadoop/hive/serde2/thrift/Type.java