full outer join behavior - hive

Question

HIVE SQL - I have 2 tables. survey and survey_comments and the structure is as shown below:
create external table if not exists survey(
id string,
category_name string,
subcategory_name string)
STORED AS parquet;
insert into survey(id, category_name, subcategory_name)
values ('1', 'Engine', 'Engine problem other than listed');
insert into survey(id, category_name, subcategory_name)
values ('1', 'Exterior Body', 'Color match of painted parts');
insert into survey(id, category_name, subcategory_name)
values ('1', 'Exterior Body', 'Tail lights');
insert into survey(id, category_name, subcategory_name)
values ('1', 'Heating/Ventilation and Cooling', 'Front windshield fogs up');
insert into survey(id, category_name, subcategory_name)
values ('1', 'Transmission', 'Rough shifting');
create external table if not exists survey_comments(
id string,
category_name_txt string,
subcategory_name_txt string,
comments string)
STORED AS parquet;
insert into survey_comments(id, category_name_txt, subcategory_name_txt)
values ('1', 'Exterior Body', 'Tail lights', 'Moisture in lower portion of rear tail lights along with leaves etc.');
insert into survey_comments(id, category_name_txt, subcategory_name_txt)
values ('1', 'Heating/Ventilation and Cooling', 'Front windshield fogs up', 'Small amount of fog low on front windshield during/after rain.');
insert into survey_comments(id, category_name_txt, subcategory_name_txt)
values ('1', 'Miscellaneous', 'General problem other than listed', 'When filling vehicle with gas; the pumps fill the gas line too quickly, had to hold the pump handle only 1/2 way on.');
insert into survey_comments(id, category_name_txt, subcategory_name_txt)
values ('1', 'Miscellaneous', 'General problem other than listed', 'Touch-up paint too red, not same red as on the car.');
Now my full outer join is as shown below:
select b.id, b.category_name, b.subcategory_name, a.category_name_txt, a.sub_category_name_txt, a.comments
from survey b full outer join survey_comments a
on (
b.id = a.id and
b.category_name = a.category_name_txt and b.subcategory_name = a.sub_category_name_txt
)
I am not getting the rows in survey_comment_txt that has category_name as 'Miscellaneous'. I need non matching rows in survey and survey_comments as seperate rows and matching rows as well. What am I doing wrong.

Answer 1

Tested using CTEs, have found two issues. 1st: You are inserting four columns in the survey_comments, but named only three. 2nd: in the query column name should be subcategory_name_txt, not sub_category_name_txt.
Test after fixing:
with survey as (
select stack(5,
'1', 'Engine', 'Engine problem other than listed',
'1', 'Exterior Body', 'Color match of painted parts',
'1', 'Exterior Body', 'Tail lights',
'1', 'Heating/Ventilation and Cooling', 'Front windshield fogs up',
'1', 'Transmission', 'Rough shifting') as (id, category_name, subcategory_name)
),
survey_comments as (
select stack(4,
'1', 'Exterior Body', 'Tail lights', 'Moisture in lower portion of rear tail lights along with leaves etc.',
'1', 'Heating/Ventilation and Cooling', 'Front windshield fogs up', 'Small amount of fog low on front windshield during/after rain.',
'1', 'Miscellaneous', 'General problem other than listed', 'When filling vehicle with gas; the pumps fill the gas line too quickly, had to hold the pump handle only 1/2 way on.',
'1', 'Miscellaneous', 'General problem other than listed', 'Touch-up paint too red, not same red as on the car.') as (id, category_name_txt, subcategory_name_txt,comments)
)
select b.id, b.category_name, b.subcategory_name, a.category_name_txt, a.subcategory_name_txt, a.comments
from survey b full outer join survey_comments a
on (
b.id = a.id and
b.category_name = a.category_name_txt and b.subcategory_name = a.subcategory_name_txt
)
Returns:
b.id b.category_name b.subcategory_name a.category_name_txt a.subcategory_name_txt a.comments
1 Engine Engine problem other than listed NULL NULL NULL
1 Exterior Body Color match of painted parts NULL NULL NULL
1 Exterior Body Tail lights Exterior Body Tail lights Moisture in lower portion of rear tail lights along with leaves etc.
1 Heating/Ventilation and Cooling Front windshield fogs up Heating/Ventilation and Cooling Front windshield fogs up Small amount of fog low on front windshield during/after rain.
NULL NULL NULL Miscellaneous General problem other than listed Touch-up paint too red, not same red as on the car.
NULL NULL NULL Miscellaneous General problem other than listed When filling vehicle with gas; the pumps fill the gas line too quickly, had to hold the pump handle only 1/2 way on.
1 Transmission Rough shifting NULL NULL NULL
Miscellaneous is returned.