SQLite Forum

FTS5: use = or MATCH to compare IDs?
Are the values in column post_fts.id a set of distinct integers? If so, you could 
just use the "rowid" field for the id.

Otherwise, assuming they are integer values (with no embedded spaces) in the post_fts.id column, I think MATCH should work quite well. The trouble comes if you have a text value like:

  '123 456 789'

then the constraints "id = ?" and "id MATCH ?" may match different sets of rows. At that point I think you have to use an "external content table" that you can create an index on: