pig script: count returns 0 on null field

Question

i have a pig script that loads a file by the "company" section of json. When I perform the count, count is 0 if domain is missing (or null) from the file. How can I have it group as empty string and still count that up?

Example of file:

{"company": {"domain": "test1.com", "name": "test1 company"}}
{"company": {"domain": "test1.com", "name": "test1 company"}}
{"company": {"domain": "test1.com", "name": "test2 company"}}
{"company": {"domain": "test2.com", "name": "test2 company"}}
{"company": {"domain": "test2.com", "name": "test3 company"}}
{"company": {"domain": "test3.com", "name": "test3 company"}}
{"company": {"domain": "test3.com", "name": "test3 company"}}
{"company": {"name": "test4 company"}}
{"company": {"name": "test4 company"}}

expected results:

"test1.com", "test1 company", 2
"test1.com", "test2 company", 1
"test2.com", "test2 company", 1
"test2.com", "test3 company", 1
"test3.com", "test3 company", 2
"", "test4 company", 2

Actual results:

"test1.com", "test1 company", 2
"test1.com", "test2 company", 1
"test2.com", "test2 company", 1
"test2.com", "test3 company", 1
"test3.com", "test3 company", 2
, "test4 company", 0

current pig script:

data = LOAD'myfile' USINGorg.apache.pig.piggybank.storage.JsonLoader('company:   (domain:chararray, name:chararray)');
filtered = FILTER data BY (company is not null);
events = FOREACH filtered GENERATE FLATTEN(company) as (domain, name);
grouped = GROUP events BY (domain, name);
counts = FOREACH grouped GENERATE group as domain, COUNT(events) as count;
ordered = ORDER counts by count DESC;

thanks for the help!

Answer 1

Instead of COUNT try COUNT_STAR,

counts = FOREACH grouped GENERATE group as domain, COUNT_STAR(events) as count;