views exposed filters capable for this? I try to create something like questionnaire using views exposed filters. I have a content type xxx with fields: 

field_1 (with options a,b,c)
field_2 (with options a,b,c)
field_3 (with options a,b,c)


I have 9 nodes, each containing only one option (node_1 has only "a" option from field_1 selected, node_2 has only "b" option from field_1 selected etc... so together 9 nodes)

Task: User chooses from 3 dropdown lists. For example choices are (field_1 - a, field_2 - a, field_3 - c)

I need the result to contain :

node that has field_1 with option "a" checked
node that has field_2 with option "a" checked
node that has field_3 with option "c" checked


Is this possible to acheive using views filters or I need another solution? I would like to use any views solution  Thank you.
This seems to be a bug in the Views module. If you have an OR filter group, Views will incorrectly use INNER JOIN instead of LEFT JOIN in the query.

One solution is to patch Views - more info &amp; patch: https://www.drupal.org/node/1766338

Another solution that is using hook_views_query_alter that changes the join type by modifying the query object: Changing an inner join to a left join in views 3.3?

A third solution (see comment below) is to check the "Reduce duplicates" checkbox for the filters in the OR group.