Teddy Choi created HIVE-20827:

             Summary: Inconsistent results for empty arrays
                 Key: HIVE-20827
                 URL: https://issues.apache.org/jira/browse/HIVE-20827
             Project: Hive
          Issue Type: Bug
            Reporter: Teddy Choi
            Assignee: Teddy Choi

LazySimpleDeserializeRead parses an empty array wrong. For example, a line ',' 
in a text file table with a delimiter ',' and schema 'array<int>, 
array<array<string>>' shows \[null\], \[\[""\]\], instead of \[\], \[\] with 
MapReduce engine and vectorized execution enabled. LazySimpleDeserializeRead 
has following code; 
switch (complexField.complexCategory) {
case LIST:
    // Allow for empty string, etc.
    final boolean isNext = (fieldPosition <= complexFieldEnd);
Empty string value read should be only applied to string families, not to other 
data types. 

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