I have a field which contains an array of Tags. I would like to be able to filter my table based on whether each row contains that tag. However Looker seems to be treating the entire array as an entity rather than allowing me to filter individually by each tag.
For example: I want to be able to filter to show all rows that contain "Blog" for example, not which equal "Article, Blog, Image".
Sebastian’s answer worked. However (for future readers) I found a better and much easier solution. There is a free community plugin called CSV Filter which is a control that filters array fields: https://lookerstudio.google.com/u/0/reporting/2b0a22a2-3992-49e1-be12-bdc22937daea/page/WoxLB