file.tags vs tags(frontmatter)

Describe the bug Using GROUP BY / FLATTEN in dataview query I’m able to obtain the expect result if work with “tags” via frontmatter (except the fact that the tag not be an ‘active/clickable’ element). That’s not possible with “file.tags”.

To Reproduce

1. Query with “tags”:

TABLE join(rows.file.link, ", ") AS Files
WHERE tags
FLATTEN tags
GROUP BY tags

Group	Files
tag1	File A
tag2	File A, File B
tag3	File C
tag4	File A, File D
tag5	File D
tag6	File A, File C, File D

The table is grouped as wanted - tag by tag -, although tags are not ‘active’ elements.

1. Query with “file.tags”

TABLE join(rows.file.link, ", ") AS Files
FROM "Teste2"
WHERE tags
FLATTEN tags
GROUP BY tags

Group	Files
#tag1 #tag2 #tag4 #tag6	File A, File A, File A, File A
#tag2	File B
#tag3 #tag6	File C, File C
#tag4 #tag6	File D, File D

The table isn’t grouped as wanted - tag by tag -, although tags are now ‘active’ elements.

Expected behavior A mix of the two previous results: a table grouped as in case 1 with ‘active’ tags as in case 2.

Desktop (please complete the following information):

• OS: macOS BigSur
• Obsidian Version: v0.12.15
• Dataview Version: 0.4.8

[blacksmithgu]

This mostly appears to be a UX problem with GROUP BY doing something stupid with variables with dots in them. I may be able to fix the behavior.

[blacksmithgu]

Ah, the reason your second query is due to a bad Dataview interaction with how GROUP BY works - it makes a variable literally called "file.tags", which you have to obtain via row["file.tags"]. I would use GROUP BY file.tags AS tag to rename it to something usable.